Bash Functions: Difference between revisions
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The function does not declare its arguments in the signature. They are available in the function's body as $1, $2, etc. | The function does not declare its arguments in the signature. They are available in the function's body as $1, $2, etc. | ||
== | ==Exit Code== | ||
A bash function does not return a value, it only allows to set an ''exit status'', which is a numerical value. 0 indicates success and a non-zero value indicates failure. The exit status is declared with the "return" keyword: | A bash function does not return a value, it only allows to set an ''exit status'', which is a numerical value. 0 indicates success and a non-zero value indicates failure. The exit status is declared with the "return" keyword: |
Revision as of 23:47, 15 July 2017
Internal
Defintion
Syntax
[function] function-name() { ... }
The "function" keyword is optional.
Arguments
The function does not declare its arguments in the signature. They are available in the function's body as $1, $2, etc.
Exit Code
A bash function does not return a value, it only allows to set an exit status, which is a numerical value. 0 indicates success and a non-zero value indicates failure. The exit status is declared with the "return" keyword:
function f() { ... return 0 }
The function's caller can retrieve the exist status with $?.