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by 22c 1695 days ago
You can use command -v in any POSIX compliant shell. csh is not POSIX compliant. Your list of shells in inexhaustive to the point of being almost misleading. bash and zsh are "heavy-weight" shells, a lot of lightweight shells also support command.

If you're specifying your shebang as #!/bin/sh then you should not assume you have access to functions like type or binaries like which, but you can generally assume you have access to the command built-in.
2 comments
rascul 1695 days ago
> If you're specifying your shebang as #!/bin/sh then you should not assume you have access to functions like type

'type' is actually POSIX though. bash does extend it.

https://pubs.opengroup.org/onlinepubs/9699919799/utilities/t...

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throwaway09223 1695 days ago
Well the point is that it's a shell component, so it's not available from anything other than a shell which is undesirable.

I understand Bourne style (POSIX) shells have the vast majority of the market, but the point is breaking other environments. "command -v" is not available everywhere so it is not a viable replacement for /usr/bin/which.

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22c 1694 days ago
"which" is also not available everywhere, that's how I know about "command -v".
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