peekfd - peek at file descriptors of running processes
2. SYNOPSIS ▲
peekfd [ -8 , --eight-bit-clean ] [ -n , --no-headers ] [ -f , --follow ] [ -d , --duplicates-removed ] [ -V , --version ] [ -h , --help ] pid [ fd ] [ fd ]
3. 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.
4. 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.
5. FILES ▲
/proc/*/fd Not used but useful for the user to look at to get good file descriptor numbers.
6. ENVIRONMENT ▲
7. DIAGNOSTICS ▲
The following diagnostics may be issued on stderr:
Error attaching to pid ... An unknown error occured while attempted to attach to a process.. you may need to be root.
8. BUGS ▲
Probably lots. Don't be surprised if the process you are monitoring dies.
9. AUTHOR ▲
Trent Waddington <>
10. SEE ALSO ▲
R ttysnoop (8)