check date to run the command

ust · 06-05-2008, 10:50 PM

I use the command "history" can show all command that I used perviously , but if I want to know when ( what time ) I used this command , can advise what can i do ? thx

chrism01 · 06-05-2008, 11:47 PM

man history

" If the shell variable HISTTIMEFORMAT is set and not null, it is used as a format string for
strftime(3) to display the time stamp associated with each displayed history entry.
No intervening blank is printed between the formatted time stamp and the history line.
"

Anithen · 06-05-2008, 11:58 PM

Hmmm, the man page mentions this briefly, but it looks like you would need to do some programming to perhaps build a utility to utilize this. Searching on google I could not find anything, but in the man page I see this:

time_t history_get_time (HIST_ENTRY *)
Return the time stamp associated with the history entry passed as the
argument

Again, I have not figured out how to use that option, but it seems like you have to use it with some custom code. Good luck, man.

I'd love to figure out how you get this functionality.

colucix · 06-06-2008, 01:10 AM

Not so obscure...

Quote:

If the shell variable HISTTIMEFORMAT is set and not null, it is used as a format string for strftime(3)

This tells you that HISTTIMEFORMAT is a shell variable, which is used as a format string with the rules used by the C function strftime, or if you prefer by the date command. So, you have simply to do something like

Code:

export HISTTIMEFORMAT="%Y%m%d %H:%M:%S "

put this in your ~/.bashrc to make it permanent and magically your history file will be populated by dates in the format you have chosen.

Anithen · 06-06-2008, 04:10 AM

Hey, colucix. Thanks for the information on how to use the info in the man page. I was totally misinterpreting it.