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In terminal the bash history is often helpful when you are searching for a command-line that you already used. But is there a way to influence the behavior of the bash history (i.e. which commands are saved, how long they are saved, how many are saved and so on)?

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Hi! You may look man history up, then ask a concrete question! :) –  B. Roland Dec 25 '10 at 19:50

4 Answers 4

up vote 4 down vote accepted

Several variables control the behaviour of your history:

  • HISTCONTROL: controls how values are saved in your history. The values ignorespace, ignoredups and erasedups can entered here (separate them by colon).
  • HISTFILE: sets the location of the history file.
  • HISTFILESIZE: sets the maximum number of lines in your history file.
  • HISTIGNORE: has a list of pattern which the bash ignores (see the other answer for syntax).
  • HISTSIZE: contains a number of lines which are remembered in the actual shell.
  • HISTTIMEFORMAT: contains an expression how an entry is formatted (see other answer)
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Setting timestamp for history:

  • By default, history do not append with timestamp, but it is easy to configure it to display timestamp, you just need to set one environment variable HISTTIMEFORMAT.

    export HISTTIMEFORMAT="%h/%d - %H:%M:%S "

  • Execute history again to see the result. alt text
  • If you dont want to save the commands in history,then

    export HISTSIZE=0

VARIABLES:

  • HISTFILE - Controls where the history file gets saved.
  • HISTFILESIZE - Controls how many history commands to keep in HISTFILE.
  • HISTSIZE - Controls how many history commands to keep in the history list of current session.
  • HISTIGNORE - Controls which commands to ignore and not save to the history list.

Note:

  • You will loss your settings once you close your terminal.So if you want it to have permanently then you should add the above command to ~/.bashrc or ~/.bash_aliases.
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You could add a line like

export HISTFILESIZE=5000

to your ~/.bashrc to increase the size of the history. By default commands started with a space are not saved. That is due to the export HISTCONTROL=ignoreboth that is globally enabled in ubuntu by default.

You can also ignore commands starting with l or which by using

export HISTIGNORE="l*:which*"
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There is a way to tell history NOT to remember a command: just start with a space. There is also a very easy way te retrieve a specific command: type CTRL+R and a word from the command you are searching for.

There is certainly a way to increase the default history which is 500 lines by defaults... but I don't know how, sorry!

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