checkbashisms script ...
checkbashisms, based on one of the checks from the lintian system, per-
forms basic checks on /bin/sh shell scripts for the possible presence
of bashisms. It takes the names of the shell scripts on the command
line, and outputs warnings if possible bashisms are detected.
Note that the definition of a bashism in this context roughly equates
to "a shell feature that is not required to be supported by POSIX";
this means that some issues flagged may be permitted under optional
sections of POSIX, such as XSI or User Portability.
In cases where POSIX and Debian Policy disagree, checkbashisms by
default allows extensions permitted by Policy but may also provide
options for stricter checking.
Show a summary of options.
Check for "echo -n" usage (non POSIX but required by Debian Pol-
Check for issues which are non POSIX but required to be sup-
ported by Debian Policy 10.4 (implies -n).
Force each script to be checked, even if it would normally not
be (for instance, it has a bash or non POSIX shell shebang or
appears to be a shell wrapper).
Highlight lines which, whilst they do not contain bashisms, may
be useful in determining whether a particular issue is a false
positive which may be ignored. For example, the use of
"$BASH_ENV" may be preceded by checking whether "$BASH" is set.
Show version and copyright information.
The exit value will be 0 if no possible bashisms or other problems were
detected. Otherwise it will be the sum of the following error values:
1 A possible bashism was detected.
2 A file was skipped for some reason, for example, because it was
unreadable or not found. The warning message will give details.
4 No bashisms were detected in a bash script.
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