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which is a utility rather than a shell command in sh and sh-derived shells. As such, it knows nothing of the shell's aliases and such. It just searches the path.

To find out what bash will execute when you type perl, use type perl. It will tell you if it's an alias. It will tell you if it's "hashed", which is to say cached. The cache can be cleared using hash -r.

Update: Added "in sh and sh-derived shells".


In reply to Re: How to run perl5.21.3 as "perl" by ikegami
in thread How to run perl5.21.3 as "perl" by syphilis

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