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README.md

Histarc

histarc is an attempt to archive all my bash command history for later reference. I started this in 2014, and it has been useful on many occasions to recall obscure command options, or remember the context around certain commands.

This relieves me from worrying about remembering particular command invocations or writing them down. I know the history is there, and I can probably find what I need with a few simple queries in less than a minute, even if its something I did years ago.

Based on my nominal rate of command-line interaction, even if I had started such an effort in 1982 on my VIC-20, I should be able to fit my entire lifetime's worth of command-line interaction in tens or hundreds of MB.

C/Sqlite version

The main version of histarc is written in C and uses an sqlite database to record command history.

histarc.bash defines a shell function histarc_update which calls the histarc binary via PROMPT_COMMAND. In my bash interactive config files (.bashrc) I set it up like this,

# histarc support.
HISTARCBASH=${HOME}/projects/histarc/histarc.bash
if [ -f $HISTARCBASH ]
then
  source $HISTARCBASH
fi

histarc uses a few files from my CTI project. Clone that in an adjacent folder if you want to build histarc.

hq is a shell function convenience wrapper around histarc query. Note that it uses sqlite glob patterns and not regexes.

Minimal edition

The C version with its sqlite database has its advantages. It is robust, it includes a useful merge subcommand to merge databases from other systems, and there is no temptation to manually edit the database outside of sqlite.

But I realized that it a simpler version is possible. histarc-minimal.bash contains an alternative implementation that simply appends a text file in the users home folder. For this version, hq uses grep to query, so it uses regexes, which is different from the C version which uses glob patterns.

Common features

Both versions include a histarc_disable shell function to disable history saving and set the HISTFILE to /dev/null, which is useful in cases like entering passwords or other sensitive information. It might be a good idea to audit and scrub history archives periodically.

Similar efforts

"There is nothing new under the sun."

How (and Why) to Log Your Entire Bash History

BASH history forever.

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