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I have been bashing my head to write a simple history script for the last two days. History is a shell-built in command I couldn't able to use that within a BASH script. So, Is there a way attain this using BASH script ?
Here we go my script for you:

history |  tail -100 > /tmp/history.log
cd /tmp
uuencode history.log history.txt  | mail -s "History log of server"
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5 Answers 5

Bash disables history in noninteractive shells by default, but you can turn it on.

set -o history
history | tail …

But if you're trying to monitor activity on that server, the shell history is useless (it's trivial to run commands that don't show up in the history). See How can I log all process launches in Linux.

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I'm not sure if it actually uses the history capability when running non-interactively, otherwise every shell script you run would clutter up your command history.

Why not go directly to the source ${HOME}/.bash_history, replace history | tail -100 with tail -100 ${HOME}/.bash_history. (If you use timestamps you'd probably have to do something along the lines of grep -v ^# ${HOME}/.bash_history | tail -100).

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The history builtin seems to be disabled inside a shell script. See here:

I have not found any official documentation about this.

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Create a script named as below. It creates a script named X and puts Y Number of lines of your history into it.


# Enable History in a non interactive shell
set -o history

# echo shabang line and x number of lines of history to new script
echo \#\!\/bin\/bash > $; history | tail -n $NUMBER_OF_LINES_BACK >> $;
chmod u+x $;

# Open the newly created script with vim
vim $;

Then if you want to create a script to a accomplish a task named "task" that you have been working on for the last 14 lines run task 14

Then clean up your history to make a nice script!

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Every user have it's own history file which is result of history command.Instead of using history command in your shell script you can use history file for user. There will be a .bash_history file in home directory of user, that will be the history file for the user.

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