path: root/testsuite/systemtap.examples/keyword-index.txt

SYSTEMTAP EXAMPLES INDEX BY KEYWORD
(see also index.txt)

= BACKTRACE =

interrupt/scf.stp - Tally Backtraces for Inter-Processor Interrupt (IPI)
keywords: interrupt backtrace

  The Linux kernel function smp_call_function causes expensive
  inter-processor interrupts (IPIs). The scf.stp script tallies the
  processes and backtraces causing the interprocessor interrupts to
  identify the cause of the expensive IPI. On exit the script prints
  the tallies in descending frequency.


io/io_submit.stp - Tally Reschedule Reason During AIO io_submit Call
keywords: io backtrace

  When a reschedule occurs during an AIO io_submit call, accumulate the
  traceback in a histogram. When the script exits prints out a sorted
  list from most common to least common backtrace.


process/sleepingBeauties.stp - Generating Backtraces of Threads Waiting for IO Operations
keywords: io scheduler backtrace

  The script monitors the time that threads spend waiting for IO
  operations (in "D" state) in the wait_for_completion function.  If a
  thread spends over 10ms, its name and backtrace is printed, and later
  so is the total delay.


= BUFFER =

network/dropwatch.stp - Watch Where Socket Buffers are Freed in the Kernel
keywords: network tracepoint buffer free

  Every five seconds the dropwatch.stp script lists the number of
  socket buffers freed at locations in the kernel.


network/sk_stream_wait_memory.stp - Track Start and Stop of Processes Due to Network Buffer Space
keywords: network tcp buffer memory

  The sk_stream-wait_memory.stp prints a time stamp, executable, and
  pid each time a process blocks due to the send buffer being full. A
  similar entry is printed each time a process continues because there
  is room in the buffer.


= CALLGRAPH =

general/para-callgraph.stp - Callgraph tracing with arguments
keywords: trace callgraph

  Print a timed per-thread callgraph, complete with function parameters
  and return values.  The first parameter names the function probe
  points to trace.  The optional second parameter names the probe
  points for trigger functions, which acts to enable tracing for only
  those functions that occur while the current thread is nested within
  the trigger.


= CPU =

general/graphs.stp - Graphing Disk and CPU Utilization
keywords: disk cpu use graph

  The script tracks the disk and CPU utilization. The resulting output
  of the script can be piped into gnuplot to generate a graph of disk
  and CPU USE.


= DISK =

general/graphs.stp - Graphing Disk and CPU Utilization
keywords: disk cpu use graph

  The script tracks the disk and CPU utilization. The resulting output
  of the script can be piped into gnuplot to generate a graph of disk
  and CPU USE.


io/disktop.stp - Summarize Disk Read/Write Traffic
keywords: disk

  Get the status of reading/writing disk every 5 seconds, output top
  ten entries during that period.


= FORMAT =

general/ansi_colors.stp - Color Table for ansi_set_color2() and ansi_set_color3()
keywords: format

  The script prints a table showing the available color combinations
  for the ansi_set_color2() and ans_set_color3() functions in the
  ansi.stp tapset.


general/ansi_colors2.stp - Show Attribues in Table for ansi_set_color3()
keywords: format

  The script prints a table showing the available attributes (bold,
  underline, and inverse) with color combinations for the
  ans_set_color3() function in the ansi.stp tapset.


= FREE =

network/dropwatch.stp - Watch Where Socket Buffers are Freed in the Kernel
keywords: network tracepoint buffer free

  Every five seconds the dropwatch.stp script lists the number of
  socket buffers freed at locations in the kernel.


= FUNCTIONS =

profiling/functioncallcount.stp - Count Times Functions Called
keywords: profiling functions

  The functioncallcount.stp script takes one argument, a list of
  functions to probe. The script will run and count the number of times
  that each of the functions on the list is called. On exit the script
  will print a sorted list from most frequently to least frequently
  called function.


= FUTEX =

process/futexes.stp - System-Wide Futex Contention
keywords: syscall locking futex

  The script watches the futex syscall on the system. On exit the
  futexes address, the number of contentions, and the average time for
  each contention on the futex are printed from lowest pid number to
  highest.


= GRAPH =

general/graphs.stp - Graphing Disk and CPU Utilization
keywords: disk cpu use graph

  The script tracks the disk and CPU utilization. The resulting output
  of the script can be piped into gnuplot to generate a graph of disk
  and CPU USE.


= INTERRUPT =

interrupt/scf.stp - Tally Backtraces for Inter-Processor Interrupt (IPI)
keywords: interrupt backtrace

  The Linux kernel function smp_call_function causes expensive
  inter-processor interrupts (IPIs). The scf.stp script tallies the
  processes and backtraces causing the interprocessor interrupts to
  identify the cause of the expensive IPI. On exit the script prints
  the tallies in descending frequency.


= IO =

io/io_submit.stp - Tally Reschedule Reason During AIO io_submit Call
keywords: io backtrace

  When a reschedule occurs during an AIO io_submit call, accumulate the
  traceback in a histogram. When the script exits prints out a sorted
  list from most common to least common backtrace.


io/ioblktime.stp - Average Time Block IO Requests Spend in Queue 
keywords: io

  The ioblktime.stp script tracks the amount of time that each block IO
  requests spend waiting for completion. The script computes the
  average time waiting time for block IO per device and prints list
  every 10 seconds. In some cases there can be too many oustanding
  block IO operations and the script may exceed the default number of
  MAXMAPENTRIES allowed. In this case the allowed number can be
  increased with "-DMAXMAPENTRIES=10000" option on the stap command
  line.


io/iostats.stp - List Executables Reading and Writing the Most Data
keywords: io profiling

   The iostat.stp script measures the amount of data successfully read
  and written by all the executables on the system.  The output is
  sorted from most greatest sum of bytes read and written by an
  executable to the least. The output contains	the count of operations
  (opens, reads, and writes), the totals and averages for the number of
  bytes read and written.


io/iotime.stp - Trace Time Spent in Read and Write for Files 
keywords: syscall read write time io

  The script watches each open, close, read, and write syscalls on the
  system. For each file the scripts observes opened it accumulates the
  amount of wall clock time spend in read and write operations and the
  number of bytes read and written. When a file is closed the script
  prints out a pair of lines for the file. Both lines begin with a
  timestamp in microseconds, the PID number, and the executable name in
  parenthesese. The first line with the "access" keyword lists the file
  name, the attempted number of bytes for the read and write
  operations. The second line with the "iotime" keyword list the file
  name and the number of microseconds accumulated in the read and write
  syscalls.


io/iotop.stp - Periodically Print I/O Activity by Process Name
keywords: io

  Every five seconds print out the top ten executables generating I/O
  traffic during that interval sorted in descending order.


io/traceio.stp - Track Cumulative I/O Activity by Process Name
keywords: io

  Every second print out the top ten executables sorted in descending
  order based on cumulative I/O traffic observed.


io/traceio2.stp - Watch I/O Activity on a Particular Device
keywords: io

  Print out the executable name and process number as reads and writes
  to the specified device occur.


io/ttyspy.stp - Monitor tty typing.
keywords: io tty per-process monitor

  The ttyspy.stp script uses tty_audit hooks to monitor recent typing
  activity on the system, printing a scrolling record of recent
  keystrokes, on a per-tty basis.


process/sleepingBeauties.stp - Generating Backtraces of Threads Waiting for IO Operations
keywords: io scheduler backtrace

  The script monitors the time that threads spend waiting for IO
  operations (in "D" state) in the wait_for_completion function.  If a
  thread spends over 10ms, its name and backtrace is printed, and later
  so is the total delay.


= LOCKING =

process/futexes.stp - System-Wide Futex Contention
keywords: syscall locking futex

  The script watches the futex syscall on the system. On exit the
  futexes address, the number of contentions, and the average time for
  each contention on the futex are printed from lowest pid number to
  highest.


= MEMORY =

memory/kmalloc-top - Show Paths to Kernel Malloc (kmalloc) Invocations
keywords: memory

  The kmalloc-top perl program runs a small systemtap script to collect
  stack traces for each call to the kmalloc function and counts the
  time that each stack trace is observed. When kmalloc-top exits it
  prints out sorted list. The output can be be filtered to print only
  only the first stack traces (-t) stack traces with more a minimum
  counts (-m), or exclude certain stack traces (-e).


memory/pfaults.stp - Generate Log of Major and Minor Page Faults
keywords: memory

  The pfaults.stp script generates a simple log for each major and
  minor page fault that occurs on the system. Each line contains a
  timestamp (in microseconds) when the page fault servicing was
  completed, the pid of the process, the address of the page fault, the
  type of access (read or write), the type of fault (major or minor),
  and the elapsed time for page fault. This log can be examined to
  determine where the page faults are occuring.


network/sk_stream_wait_memory.stp - Track Start and Stop of Processes Due to Network Buffer Space
keywords: network tcp buffer memory

  The sk_stream-wait_memory.stp prints a time stamp, executable, and
  pid each time a process blocks due to the send buffer being full. A
  similar entry is printed each time a process continues because there
  is room in the buffer.


= MONITOR =

io/ttyspy.stp - Monitor tty typing.
keywords: io tty per-process monitor

  The ttyspy.stp script uses tty_audit hooks to monitor recent typing
  activity on the system, printing a scrolling record of recent
  keystrokes, on a per-tty basis.


= NETWORK =

network/dropwatch.stp - Watch Where Socket Buffers are Freed in the Kernel
keywords: network tracepoint buffer free

  Every five seconds the dropwatch.stp script lists the number of
  socket buffers freed at locations in the kernel.


network/nettop.stp - Periodic Listing of Processes Using Network Interfaces
keywords: network traffic per-process

  Every five seconds the nettop.stp script prints out a list of
  processed (PID and command) with the number of packets sent/received
  and the amount of data sent/received by the process during that
  interval.


network/sk_stream_wait_memory.stp - Track Start and Stop of Processes Due to Network Buffer Space
keywords: network tcp buffer memory

  The sk_stream-wait_memory.stp prints a time stamp, executable, and
  pid each time a process blocks due to the send buffer being full. A
  similar entry is printed each time a process continues because there
  is room in the buffer.


network/socket-trace.stp - Trace Functions called in Network Socket Code
keywords: network socket

  The script instrument each of the functions inn the Linux kernel's
  net/socket.c file. The script prints out trace. The first element of
  a line is  time delta in microseconds from the previous entry. This
  is followed by the command name and the PID. The "->" and "<-"
  indicates function entry and	function exit, respectively. The last
  element of the line is the function name.


network/tcp_connections.stp - Track Creation of Incoming TCP Connections
keywords: network tcp socket

  The tcp_connections.stp script prints information for each new
  incoming TCP connection accepted by the computer. The information
  includes the UID, the command accepting the connection, the PID of
  the command, the port the connection is on, and the IP address of the
  originator of the request.


network/tcpdumplike.stp - Dump of Received TCP Packets
keywords: network traffic

  The tcpdumplike.stp prints out a line for each TCP packet received.
  Each line includes the source and destination IP addresses, the
  source and destination ports, and flags.


= PER-PROCESS =

io/ttyspy.stp - Monitor tty typing.
keywords: io tty per-process monitor

  The ttyspy.stp script uses tty_audit hooks to monitor recent typing
  activity on the system, printing a scrolling record of recent
  keystrokes, on a per-tty basis.


network/nettop.stp - Periodic Listing of Processes Using Network Interfaces
keywords: network traffic per-process

  Every five seconds the nettop.stp script prints out a list of
  processed (PID and command) with the number of packets sent/received
  and the amount of data sent/received by the process during that
  interval.


= PROCESS =

process/errsnoop.stp - tabulate system call errors
keywords: process syscall

  The script prints a periodic tabular report about failing system
  calls, by process and by syscall failure.  The first optional
  argument specifies the reporting interval (in seconds, default 5);
  the second optional argument gives a screen height (number of lines
  in the report, default 20).


process/forktracker.stp - Trace Creation of Processes
keywords: process scheduler

  The forktracker.stp script prints out a time-stamped entry showing
  each fork and exec operation on the machine. This can be useful for
  determine what process is creating a flurry of short-lived processes.


process/schedtimes.stp - Track Time Processes Spend in Various States using Tracepoints
keywords: process scheduler time tracepoint

  The schedtimes.stp script instruments the scheduler to track the
  amount of time that each process spends running, sleeping, queued,
  and waiting for io. On exit the script prints out the accumulated
  time for each state of processes observed.  Optionally, this script
  can be used with the '-c' or '-x' options to focus on a specific PID.


= PROFILING =

io/iostats.stp - List Executables Reading and Writing the Most Data
keywords: io profiling

   The iostat.stp script measures the amount of data successfully read
  and written by all the executables on the system.  The output is
  sorted from most greatest sum of bytes read and written by an
  executable to the least. The output contains	the count of operations
  (opens, reads, and writes), the totals and averages for the number of
  bytes read and written.


process/pf2.stp - Profile kernel functions
keywords: profiling

  The pf2.stp script sets up time-based sampling. Every five seconds it
  prints out a sorted list with the top ten kernel functions with
  samples.


profiling/functioncallcount.stp - Count Times Functions Called
keywords: profiling functions

  The functioncallcount.stp script takes one argument, a list of
  functions to probe. The script will run and count the number of times
  that each of the functions on the list is called. On exit the script
  will print a sorted list from most frequently to least frequently
  called function.


profiling/thread-times.stp - Profile kernel functions
keywords: profiling

  The thread-times.stp script sets up time-based sampling. Every five
  seconds it prints out a sorted list with the top twenty processes
  with samples broken down into percentage total time spent in
  user-space and kernel-space.


profiling/timeout.stp - Show Processes Doing Polling Operations
keywords: profiling

  The timeout.stp script is based on a blog entry
  (http://udrepper.livejournal.com/19041.html) mentioning a need for a
  tool to help developers find applications that are polling. The
  timeout.stp script monitors systemcall used for polling and records
  the systemcalls that timed out rather than returned because some
  action occurred. The script updates the screen once a second with the
  top twenty processes.


profiling/topsys.stp - Show Processes Doing Polling Operations
keywords: profiling

   The topsys.stp script lists out the top twenty systemcalls for the
  previous 5 seconds. The output is sorted from most frequent to least
  frequent.


= READ =

io/iotime.stp - Trace Time Spent in Read and Write for Files 
keywords: syscall read write time io

  The script watches each open, close, read, and write syscalls on the
  system. For each file the scripts observes opened it accumulates the
  amount of wall clock time spend in read and write operations and the
  number of bytes read and written. When a file is closed the script
  prints out a pair of lines for the file. Both lines begin with a
  timestamp in microseconds, the PID number, and the executable name in
  parenthesese. The first line with the "access" keyword lists the file
  name, the attempted number of bytes for the read and write
  operations. The second line with the "iotime" keyword list the file
  name and the number of microseconds accumulated in the read and write
  syscalls.


= SCHEDULER =

process/forktracker.stp - Trace Creation of Processes
keywords: process scheduler

  The forktracker.stp script prints out a time-stamped entry showing
  each fork and exec operation on the machine. This can be useful for
  determine what process is creating a flurry of short-lived processes.


process/schedtimes.stp - Track Time Processes Spend in Various States using Tracepoints
keywords: process scheduler time tracepoint

  The schedtimes.stp script instruments the scheduler to track the
  amount of time that each process spends running, sleeping, queued,
  and waiting for io. On exit the script prints out the accumulated
  time for each state of processes observed.  Optionally, this script
  can be used with the '-c' or '-x' options to focus on a specific PID.


process/sleepingBeauties.stp - Generating Backtraces of Threads Waiting for IO Operations
keywords: io scheduler backtrace

  The script monitors the time that threads spend waiting for IO
  operations (in "D" state) in the wait_for_completion function.  If a
  thread spends over 10ms, its name and backtrace is printed, and later
  so is the total delay.


= SIGNALS =

process/sig_by_pid.stp -  Signal Counts by Process ID
keywords: signals

  Print signal counts by process ID in descending order.


process/sig_by_proc.stp -  Signal Counts by Process Name
keywords: signals

  Print signal counts by process name in descending order.


process/sigkill.stp - Track SIGKILL Signals
keywords: signals

  The script traces any SIGKILL signals. When that SIGKILL signal is
  sent to a process, the script prints out the signal name, the
  desination executable and process ID, the executable name user ID
  that sent the signal.


process/sigmon.stp - Track a particular signal to a specific process
keywords: signals

  The script watches for a particular signal sent to a specific
  process. When that signal is sent to the specified process, the
  script prints out the PID and executable of the process sending the
  signal, the PID and executable name of the process receiving the
  signal, and the signal number and name.


= SIMPLE =

general/helloworld.stp - SystemTap "Hello World" Program
keywords: simple

  A basic "Hello World" program implemented in SystemTap script. It
  prints out "hello world" message and then immediately exits.


= SLEEP =

process/sleeptime.stp - Trace Time Spent in nanosleep Syscalls
keywords: syscall sleep

  The script watches each nanosleep syscall on the system. At the end
  of each nanosleep syscall the script prints out a line with a
  timestamp in microseconds, the pid, the executable name in
  paretheses, the "nanosleep:" key, and the duration of the sleep in
  microseconds.


= SOCKET =

network/socket-trace.stp - Trace Functions called in Network Socket Code
keywords: network socket

  The script instrument each of the functions inn the Linux kernel's
  net/socket.c file. The script prints out trace. The first element of
  a line is  time delta in microseconds from the previous entry. This
  is followed by the command name and the PID. The "->" and "<-"
  indicates function entry and	function exit, respectively. The last
  element of the line is the function name.


network/tcp_connections.stp - Track Creation of Incoming TCP Connections
keywords: network tcp socket

  The tcp_connections.stp script prints information for each new
  incoming TCP connection accepted by the computer. The information
  includes the UID, the command accepting the connection, the PID of
  the command, the port the connection is on, and the IP address of the
  originator of the request.


= SYSCALL =

io/iotime.stp - Trace Time Spent in Read and Write for Files 
keywords: syscall read write time io

  The script watches each open, close, read, and write syscalls on the
  system. For each file the scripts observes opened it accumulates the
  amount of wall clock time spend in read and write operations and the
  number of bytes read and written. When a file is closed the script
  prints out a pair of lines for the file. Both lines begin with a
  timestamp in microseconds, the PID number, and the executable name in
  parenthesese. The first line with the "access" keyword lists the file
  name, the attempted number of bytes for the read and write
  operations. The second line with the "iotime" keyword list the file
  name and the number of microseconds accumulated in the read and write
  syscalls.


process/errsnoop.stp - tabulate system call errors
keywords: process syscall

  The script prints a periodic tabular report about failing system
  calls, by process and by syscall failure.  The first optional
  argument specifies the reporting interval (in seconds, default 5);
  the second optional argument gives a screen height (number of lines
  in the report, default 20).


process/futexes.stp - System-Wide Futex Contention
keywords: syscall locking futex

  The script watches the futex syscall on the system. On exit the
  futexes address, the number of contentions, and the average time for
  each contention on the futex are printed from lowest pid number to
  highest.


process/sleeptime.stp - Trace Time Spent in nanosleep Syscalls
keywords: syscall sleep

  The script watches each nanosleep syscall on the system. At the end
  of each nanosleep syscall the script prints out a line with a
  timestamp in microseconds, the pid, the executable name in
  paretheses, the "nanosleep:" key, and the duration of the sleep in
  microseconds.


process/syscalls_by_pid.stp - System-Wide Count of Syscalls by PID
keywords: syscall

  The script watches all syscall on the system. On exit the script
  prints a list showing the number of systemcalls executed by each PID
  ordered from greatest to least number of syscalls.


process/syscalls_by_proc.stp - System-Wide Count of Syscalls by Executable
keywords: syscall

  The script watches all syscall on the system. On exit the script
  prints a list showing the number of systemcalls executed by each
  executable ordered from greates to least number of syscalls.


process/wait4time.stp - Trace Time Spent in wait4 Syscalls
keywords: syscall wait4

  The script watches each wait4 syscall on the system. At the end of
  each wait4 syscall the script prints out a line with a timestamp in
  microseconds, the pid, the executable name in paretheses, the
  "wait4:" key, the duration of the wait and the PID that the wait4 was
  waiting for. If the waited for PID is not specified , it is "-1".


= TCP =

network/sk_stream_wait_memory.stp - Track Start and Stop of Processes Due to Network Buffer Space
keywords: network tcp buffer memory

  The sk_stream-wait_memory.stp prints a time stamp, executable, and
  pid each time a process blocks due to the send buffer being full. A
  similar entry is printed each time a process continues because there
  is room in the buffer.


network/tcp_connections.stp - Track Creation of Incoming TCP Connections
keywords: network tcp socket

  The tcp_connections.stp script prints information for each new
  incoming TCP connection accepted by the computer. The information
  includes the UID, the command accepting the connection, the PID of
  the command, the port the connection is on, and the IP address of the
  originator of the request.


= TIME =

io/iotime.stp - Trace Time Spent in Read and Write for Files 
keywords: syscall read write time io

  The script watches each open, close, read, and write syscalls on the
  system. For each file the scripts observes opened it accumulates the
  amount of wall clock time spend in read and write operations and the
  number of bytes read and written. When a file is closed the script
  prints out a pair of lines for the file. Both lines begin with a
  timestamp in microseconds, the PID number, and the executable name in
  parenthesese. The first line with the "access" keyword lists the file
  name, the attempted number of bytes for the read and write
  operations. The second line with the "iotime" keyword list the file
  name and the number of microseconds accumulated in the read and write
  syscalls.


process/schedtimes.stp - Track Time Processes Spend in Various States using Tracepoints
keywords: process scheduler time tracepoint

  The schedtimes.stp script instruments the scheduler to track the
  amount of time that each process spends running, sleeping, queued,
  and waiting for io. On exit the script prints out the accumulated
  time for each state of processes observed.  Optionally, this script
  can be used with the '-c' or '-x' options to focus on a specific PID.


= TRACE =

general/para-callgraph.stp - Callgraph tracing with arguments
keywords: trace callgraph

  Print a timed per-thread callgraph, complete with function parameters
  and return values.  The first parameter names the function probe
  points to trace.  The optional second parameter names the probe
  points for trigger functions, which acts to enable tracing for only
  those functions that occur while the current thread is nested within
  the trigger.


= TRACEPOINT =

network/dropwatch.stp - Watch Where Socket Buffers are Freed in the Kernel
keywords: network tracepoint buffer free

  Every five seconds the dropwatch.stp script lists the number of
  socket buffers freed at locations in the kernel.


process/schedtimes.stp - Track Time Processes Spend in Various States using Tracepoints
keywords: process scheduler time tracepoint

  The schedtimes.stp script instruments the scheduler to track the
  amount of time that each process spends running, sleeping, queued,
  and waiting for io. On exit the script prints out the accumulated
  time for each state of processes observed.  Optionally, this script
  can be used with the '-c' or '-x' options to focus on a specific PID.


= TRAFFIC =

network/nettop.stp - Periodic Listing of Processes Using Network Interfaces
keywords: network traffic per-process

  Every five seconds the nettop.stp script prints out a list of
  processed (PID and command) with the number of packets sent/received
  and the amount of data sent/received by the process during that
  interval.


network/tcpdumplike.stp - Dump of Received TCP Packets
keywords: network traffic

  The tcpdumplike.stp prints out a line for each TCP packet received.
  Each line includes the source and destination IP addresses, the
  source and destination ports, and flags.


= TTY =

io/ttyspy.stp - Monitor tty typing.
keywords: io tty per-process monitor

  The ttyspy.stp script uses tty_audit hooks to monitor recent typing
  activity on the system, printing a scrolling record of recent
  keystrokes, on a per-tty basis.


= USE =

general/graphs.stp - Graphing Disk and CPU Utilization
keywords: disk cpu use graph

  The script tracks the disk and CPU utilization. The resulting output
  of the script can be piped into gnuplot to generate a graph of disk
  and CPU USE.


= WAIT4 =

process/wait4time.stp - Trace Time Spent in wait4 Syscalls
keywords: syscall wait4

  The script watches each wait4 syscall on the system. At the end of
  each wait4 syscall the script prints out a line with a timestamp in
  microseconds, the pid, the executable name in paretheses, the
  "wait4:" key, the duration of the wait and the PID that the wait4 was
  waiting for. If the waited for PID is not specified , it is "-1".


= WRITE =

io/iotime.stp - Trace Time Spent in Read and Write for Files 
keywords: syscall read write time io

  The script watches each open, close, read, and write syscalls on the
  system. For each file the scripts observes opened it accumulates the
  amount of wall clock time spend in read and write operations and the
  number of bytes read and written. When a file is closed the script
  prints out a pair of lines for the file. Both lines begin with a
  timestamp in microseconds, the PID number, and the executable name in
  parenthesese. The first line with the "access" keyword lists the file
  name, the attempted number of bytes for the read and write
  operations. The second line with the "iotime" keyword list the file
  name and the number of microseconds accumulated in the read and write
  syscalls.