On Sat, Jul 10, 2010 at 11:22:27AM +0800, Clark J. Wang wrote: > For example, in the interactive shell, I want to track the time when every > inputted command is invoked. So I want to run a `date' command before > actually invoking the inputted command. For now I have to do like this: > > $ date; command1 > $ date; command2
You could set a DEBUG trap. trap 'date +%H:%M:%S' DEBUG > On Sat, Jul 10, 2010 at 11:30 AM, Eric Blake <ebl...@redhat.com> wrote: > > Not quite before the command, but it is very easy to include $(date) as > > part of PS1 to have a timestamp listed in the prompt that is printed > > after every command. On Sat, Jul 10, 2010 at 11:54:05AM +0800, Clark J. Wang wrote: > Yes, timestamp in PS1 is fine for after-command purposes. And actually I use > the PROMPT_COMMAND var for that. unset PROMPT_COMMAND PS1='$(date +%H:%M:%S)|\h:\w\$ ' Personally I've never found any use for PROMPT_COMMAND. It seems klunky and awkward.
