What does hash -r command do?

garage_greg

I recently switched to linux full time from windows and while I was trying to update my npm package using n , I got the new binaries in /usr/local/bin and previous version was in /usr/bin . So, it was always picking the previous version. As per recommendation by a fellow user, I used hash -r command and it worked. But, I don't know what it did. It would be very helpful if someone could explain its internals to me.

Originally asked by gschambial on Stack Exchange (askubuntu) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

hash is a built-in command of the bash shell. For a summary of what it does you can type help hash at the shell prompt: $ help hash hash: hash [-lr] [-p pathname] [-dt] [name ...] Remember or display program locations. Determine and remember the full pathname of each command NAME. If no arguments are given, information about remembered commands is displayed. Options: -d forget the remembered location of each NAME -l display in a format that may be reused as input -p pathname use PATHNAME as the full pathname of NAME -r forget all remembered locations -t print the remembered location of each NAME, preceding each location with the corresponding NAME if multiple NAMEs are given Arguments: NAME...

Full answer by steeldriver: https://askubuntu.stackexchange.com/a/952140 (CC BY-SA 4.0).

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