Question

Where can I find the STDERR if I run I bash command. Will both the STDOUT and STDERR be displayed on the screen simultaneously if I don’t log the result in a file.

Answer 1

You can’t “find” stdout or stderr. By default they’re redirected to the screen.

You can redirect them to a file for example:

• redirect stdout to a ls-l.txt:

  ls -l > ls-l.txt
  

• redirect stderr to grep-errors.txt

  grep da * 2> grep-errors.txt
  

• redirect stdout to stderr:

  grep da * 1>&2
  

All of this is well explained here: http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-3.html