Drew DeVault • 5/4/2018

Redirecting stderr of a running process

This technical blog post explains how to redirect the standard error (stderr) output of an already-running Linux process to a file. It details a method using the GNU debugger (gdb) to attach to the process and execute code that uses dup2 and open syscalls, providing a cleaner alternative to strace-based approaches. The article includes the specific gdb commands and a code snippet to calculate necessary flags.

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#debugging #linux #Process Management