We can always set time to the commands showed in history command. Why we require to set time for this?
This is totally a security measure and used for troubleshooting/fingerprinting a security threat.
history command sample output before setting this variable.
466 df -h 467 df 468 exit 469 nfsstat 470 find / -iname *.ppt 471 ftp2 472 man ping 473 ping -R google.com
So how to set that?
Use inbuilt variable HISTTIMEFORMAT to set the values as shown below
#export HISTTIMEFORMAT='%F %T '
%F for setting year/month/day
%T for setting time
now try to execute history command to see the difference
#history
sample output
500 2011-03-16 17:06:09 exit 501 2011-03-16 17:06:14 apt-get install tree 502 2011-03-16 17:06:36 tree 503 2011-03-16 17:06:54 man tree 504 2011-03-16 17:07:02 tree -d 505 2011-03-16 17:07:07 tree
If you restart/logout from machine will this setting available to you?
A simple answer for this is no. Then how can we make it permanent?
Just append this variable to .bash_profile for every user.
echo "export HISTTIMEFORMAT='%F %T '" >> ~/.bash_profile
How about setting this value to the new user which are going to be created on the machine?
export it to /etc/profile file
echo "export HISTTIMEFORMAT='%F %T '" >> /etc/profile
Please feel free to comment your thoughts on this.
cool
Can you still;
!447
Repeat of that.
Change shell properties with Linux shopt command
[...] From now on words you can see all your history without any issue(with merged with your previous sessions). Do you want to see what time you executed your commands in history? Click here [...]
Change shell properties with Linux shopt command
[...] From now on words you can see all your history without any issue(with merged with your previous sessions). Do you want to know what time you executed your commands in history? Click here [...]
Very useful site….explained in such a simple way even a linux fresher can become expert…grt going guys
thanks Shaikh, Keep visiting the site and refer your friends to http://www.linuxnix.com
Its very dangerous command because its showing only current date for all history.