# peekfd(1) - man - phpMan

[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**]  [**-f**,**--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
       Trent Waddington ⟨<trent.waddington@gmail.com>⟩

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



psmisc                                       2020-09-09                                    [PEEKFD(1)](https://www.chedong.com/phpMan.php/man/PEEKFD/1/markdown)