On Tue, Jul 27, 2021 at 04:26:34PM +0200, Simon Richter wrote:
> Also, take care when moving shell commands from a shell script: the bash
> shell at least keeps a cache of commands to paths so it doesn't have to do a
> full path search every time. A shell script that calls
>
> mv /bin/cp /usr/bin/cp
> ln -s ../usr/bin/cp bin/cp
> mv /bin/ln /usr/bin/ln
> ln -s ../usr/bin/ln bin/ln
>
> could fall over because it cached the location of "ln" as /bin/ln in the
> beginning, then after the move cannot find it anymore. That needs at least a
> "hash -d ln".
This is why I said to use cp, not mv, when moving the file...
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