# man > PEEKFD(1)

[_PEEKFD_(1)](https://www.chedong.com/phpMan.php/man/PEEKFD/1/markdown)                                   User Commands                                  [_PEEKFD_(1)](https://www.chedong.com/phpMan.php/man/PEEKFD/1/markdown)

## NAME
       peekfd - peek at file descriptors of running processes

## SYNOPSIS
       **peekfd   **[**-8**,**--eight-bit-clean**]   [**-n**,**--no-headers**]  [**-c**,**--follow**]  [**-d**,**--duplicates-removed**]
       [**-V**,**--version**] [**-h**,**--help**] _pid_ [_fd_] [_fd_] ...

## DESCRIPTION
       **peekfd **attaches to a running process and intercepts all reads and writes to file descriptors.
       You can specify the desired file descriptor numbers or dump all of them.

## OPTIONS
       -8     Do no post-processing on the bytes being read or written.

       -n     Do not display headers indicating the source of the bytes dumped.

       -c     Also dump the requested file descriptor activity in any new child processes  that  are
              created.

       -d     Remove  duplicate  read/writes from the output.  If you're looking at a tty with echo,
              you might want this.

       -v     Display a version string.

       -h     Display a help message.

## FILES
       **/proc/_***_**/fd**
              Not used but useful for the user to look at to get good file descriptor numbers.

## ENVIRONMENT
       None.

## DIAGNOSTICS
       The following diagnostics may be issued on stderr:

       **Error attaching to pid _**<PID>_
              An unknown error occurred while attempted to attach to a process, you may need  to  be
              root.

## BUGS
       Probably lots.  Don't be surprised if the process you are monitoring dies.

## AUTHOR
       ]8;;mailto:<trent.waddington@gmail.com>\Trent Waddington]8;;\

## SEE ALSO
       [**ttysnoop**(8)](https://www.chedong.com/phpMan.php/man/ttysnoop/8/markdown)

psmisc                                       2021-12-01                                    [_PEEKFD_(1)](https://www.chedong.com/phpMan.php/man/PEEKFD/1/markdown)