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Is there an environment variable you can use in Linux to send your command history to a different file?

The reason I ask is that I'm interested in recording my shell sessions into different files for referencing later.

I know I could use auditd or something like that, but that's an awful lot to setup for just recording my sessions, so I thought I'd ask if there's an environment variable or something I could use instead.

  • set | grep HIST? – Cyrus Sep 27 '19 at 19:46
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    You can always do history -a <FILE> at the end of each session to save current subshell's history. – Arkadiusz Drabczyk Sep 27 '19 at 19:50
  • @ArkadiuszDrabczyk you should make that an answer (possibly along with mentioning HISTFILE which Cyrus seems to be alluding to.) – derobert Sep 27 '19 at 20:03
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I have recently answered a very similar question asked at Ask Ubuntu: https://askubuntu.com/questions/1175757/how-can-i-save-a-part-of-command-lines-into-a-new-file-using-history-command/1175763#1175763

You need to use -a together with a file name. As explained in help history:

history: history [-c] [-d offset] [n] or history -anrw [filename] or history -ps arg [arg...]

(...)

-a append history lines from this session to the history file

And later on:

If FILENAME is given, it is used as the history file. Otherwise, if $HISTFILE has a value, that is used, else ~/.bash_history.

For example, start a new session and type this ($ is a prompt, it will most probably be different on your system):

$ echo a-new-session started at $(date)
$ history -a /tmp/new-history

In this case /tmp/new-history will be:

echo a-new-session started at $(date)
history -a /tmp/new-history
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