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When I execute a program without specifying the full path to the executable, and Bash must search the directories in $PATH to find the binary, it seems that Bash remembers the path in some sort of cache. For example, I installed a build of Subversion from source to /usr/local, then typed svnsync help at the Bash prompt. Bash located the binary /usr/local/bin/svnsync for "svnsync" and executed it. Then when I deleted the installation of Subversion in /usr/local and re-ran svnsync help, Bash responds:

bash: /usr/local/bin/svnsync: No such file or directory

But, when I start a new instance of Bash, it finds and executes /usr/bin/svnsync.

How do I clear the cache of paths to executables?

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3 Answers 3

up vote 106 down vote accepted

bash does cache the full path to a command. You can verify that the command you are trying to execute is hashed with the type command:

$ type svnsync
svnsync is hashed (/usr/local/bin/svnsync)

To clear the entire cache:

$ hash -r

Or just one entry:

$ hash -d svnsync

For additional information, consult help hash and man bash.

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Thank you very much! –  Daniel Trebbien Jan 10 '11 at 15:40
@Daniel It's worth adding that, in bash, you can use the command "type command" to find out what type of command it is - if your command is hashed, "type" will tell you. It's also useful to tell whether something's a shell builtin or an alias. –  lunchmeat317 May 11 '11 at 20:59
+1. I had not idea, but had a similar problem with the id command. –  deuberger May 17 '11 at 16:11
As an FYI, to change the cached PATH if running csh, the command is rehash. –  kurtm Oct 12 '13 at 0:21
In one command selective rehashing can be invoked by hash svnsync. –  Ioannis Filippidis Aug 9 '14 at 0:44

To clear just one entry you need a different flag:

hash -d svnsync

The -r flag doesn't take a parameter and will always delete the entire cache.
(At least in bash 3.2.39 on Debian Lenny)

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As user johntex has noted in a comment to the answer by user Tobu, the simplest practical action in Bash is to rehash just your program:

hash svnsync

That's all.

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