A mai Kérdések és válaszok munkamenetét a SuperUser - a Stack Exchange, a Q & A weboldalak közösség által irányított csoportosulásának részlegével - köszönheti.
A kérdés
A SuperUser olvasó Hendre azt szeretné megtudni, hogy mikor kell használni #! / Bin / bash ahelyett #! / Bin / sh a héj scriptekben:
When is it more appropriate to use #!/bin/bash rather than #!/bin/sh in a shell script?
Mikor jobb használni #! / Bin / bash ahelyett #! / Bin / sh egy shell parancsfájlban?
A válasz
A SuperUser közreműködő grawity-nek a választ számunkra:
In short:
- There are several shells which implement a superset of the POSIX sh specification. On different systems, /bin/sh might be a link to ash, bash, dash, ksh, zsh, etc. It will always be sh-compatible though, never csh or fish.
- As long as you stick to sh features only, you can (and probably even should) use #!/bin/sh and the script should work fine, no matter which shell it is.
- If you start using bash-specific features (i.e. arrays), you should specifically request bash because, even if /bin/sh already invokes bash on your system, it might not on everyone else’s system, and your script will not run there. The same applies to zsh and ksh, of course.
- Even if the script is for personal use only, you might notice that some operating systems change /bin/sh during upgrades. For example, on Debian it used to be bash, but was later replaced with the very minimal dash. Scripts which used bashisms but had #!/bin/sh suddenly broke.
However:
- Even #!/bin/bash is not that correct. On different systems, bash might live in /usr/bin, /usr/pkg/bin, or /usr/local/bin.
- A more reliable option is #!/usr/bin/env bash, which uses $PATH. Although the env tool itself is not strictly guaranteed either, /usr/bin/env still works on more systems than /bin/bash does.
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Képhitel: Wikipedia
