Sonntag, 2. August 2015

Bash syntax check

When automating your administrative tasks also shell scripts are checked in to a version control system. The built-in command line argument -n allows a syntax check of the shell script without executing it:

$ bash -n
$ echo $?
If the syntax check is successful nothing is displayed and the exit code is 0. However, if there is an error (like in the following case a missing parenthesis) an error message is printed and the exit code is 2:
$ bash -n
./ line 23: syntax error: unexpected end of file
$ echo $?
When checking your scripts in that way inside your continuous delivery pipeline it is easy to spot simple type errors.

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