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[Help-bash] `shopt -s histappend` vs `export PROMPT_COMMAND="history -a"

From: Peng Yu
Subject: [Help-bash] `shopt -s histappend` vs `export PROMPT_COMMAND="history -a"`
Date: Sat, 2 May 2015 22:32:53 -0500


I see the following two ways to update the history file. Are they
equivalent? Or they might be slightly different in some way?

- `shopt -s histappend`
- `export PROMPT_COMMAND="history -a"`

I have `shopt -s histappend` in ~/.bashrc in a machine whose home is
on an nfs. But I frequently encounter hanging on history related
commands upon long. (I have not got the time to try export
PROMPT_COMMAND="history -a"`).

Could `shopt -s histappend` cause NFS related problems?


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