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  • See here. Try using exec. Commented Sep 23, 2014 at 16:10
  • That doesn't work the way you say it does. Using 'exec' in a command substitution just forks a shell that immediately exits, incurring the full overhead and other issues of spawning a subshell; you can verify this by '/usr/bin/echo'ing $BASH_SUBSHELL within such an invocation. Commented Sep 23, 2014 at 16:26
  • See Vinc17's answer below. An implicit exec vs something like an explicit exec: exec 2>/dev/null Commented Sep 23, 2014 at 16:32
  • foo=$(grep ... | awk) spawns one subshell, for the command substitution. Commented Sep 26, 2014 at 2:09
  • 1
    You can spare one process: foo=$(awk '/someword/ {print $3}' /path/to/somefile)... Commented Oct 30, 2014 at 0:10