When I run the history command on my ubuntu server, I get output as follows:   history   ...   25  cd ~   26  ls -a   27  vim /etc/gitconfig   28  vim ~/.gitconfigI want to view the datetime of a particular user. However when I assume them:su otheruserexport HISTTIMEFORMAT='%F %T  'history...25  cd ~26  ls -a27  vim /etc/gitconfig28  vim ~/.gitconfigIt still doesn't show datetime. I am using zsh shell.
datetime stamp when running history command in zsh shell
command history
I believe the HISTTIMEFORMAT is for Bash shells. If you're using zsh then you could use these switches to the history command:Examples$ history -E    1   2.12.2013 14:19  history -E$ history -i    1  2013-12-02 14:19  history -E$ history -D    1  0:00  history -E    2  0:00  history -iIf you do a man zshoptions or man zshbuiltins you can find out more information about these switches as well as other info related to history.excerpt from zshbuiltins man pageAlso when listing,  -d     prints timestamps for each command  -f     prints full time-date stamps in the US `MM/DD/YY hh:mm' format  -E     prints full time-date stamps in the European `dd.mm.yyyy hh:mm' format  -i     prints full time-date stamps in ISO8601 `yyyy-mm-dd hh:mm' format  -t fmt prints time and date stamps in the given format; fmt is formatted          with the strftime function with the  zsh extensions described for          the %D{string} prompt format in the section EXPANSION OF PROMPT          SEQUENCES in zshmisc(1).  The resulting formatted string must be no          more than 256 characters or will not be printed.  -D     prints elapsed times; may be combined with one of the options above.Debugging invocationYou can use the following 2 methods to debug zsh when you invoke it.Method #1$ zsh -xvMethod #2$ zsh$ setopt XTRACE VERBOSEIn either case you should see something like this when it starts up:$ zsh -xv## /etc/zshenv is sourced on all invocations of the# shell, unless the -f option is set.  It should# contain commands to set the command search path,# plus other important environment variables.# .zshenv should not contain commands that produce# output or assume the shell is attached to a tty.### /etc/zshrc is sourced in interactive shells.  It# should contain commands to set up aliases, functions,# options, key bindings, etc.### shell functions......unset -f pathmunge _src_etc_profile_d+/etc/zshrc:49> unset -f pathmunge _src_etc_profile_d# Created by newuser for 4.3.10