Define shell variable HISTIGNORE so that comments (lines starting with #) appear in shell history

export HISTIGNORE=' cd "`*: PROMPT_COMMAND=?*?'
I was surprised to find that with RedHat bash, I could not find any comment lines (begining with #) in my bash shell history. Surprised because in Mageia Linux this works. It turns out that RedHat's bash will keep comment lines if in my .bashrc, I define: export HISTIGNORE=' cd "`*: PROMPT_COMMAND=?*?' Why have comment lines in shell history? It's a handy and convenient way to make proto-commands (to be completed later) and for storing brief text data that is searchable in shell history.
Sample Output
$ export HISTIGNORE=' cd "`*: PROMPT_COMMAND=?*?' ; exec bash
$ # store some text here
$ history | tail -3
 1000  export HISTIGNORE=' cd "`*: PROMPT_COMMAND=?*?' ; exec bash
 1001  # store some text here
 1002  history | tail -3

By: mpb
2011-10-18 19:58:39

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Randy45 · 13 weeks and 2 days ago

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Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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