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My home directory is mounted on an NFS mount. The commands I use on one machine are usually quite different to those on another. Is it possible to have easy host write to it's own history file?

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It certainly is. You just have to change the name of your history file on each host. In your .bash_profile put something like:

export HISTFILE="${HOME}/.bash_history.`hostname`"
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My bash wouldn't expand ~, so I had to use ${HOME} export HISTFILE="${HOME}/.bash_history.$(hostname)" – brianegge Dec 14 '09 at 23:16
Thanks, modified the answer. – Kamil Kisiel Dec 15 '09 at 23:35
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There is the environment variable HISTFILE, which controls where the history file is. You could try to create a login script that resets HISTFILE according to your hostname/IP.

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