NAME

       checkbashisms - check for bashisms in /bin/sh scripts

SYNOPSIS

       checkbashisms script ...
       checkbashisms --help|--version

DESCRIPTION

       checkbashisms, based on one of the checks from the lintian system, performs 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.

OPTIONS

       --help, -h
              Show a summary of options.

       --newline, -n
              Check for "echo -n" usage (non POSIX but required by Debian Policy 10.4.)

       --posix, -p
              Check for issues which are non POSIX but required to be supported by Debian Policy  10.4  (implies
              -n).

       --force, -f
              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).

       --extra, -x
              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.

       --version, -v
              Show version and copyright information.

EXIT VALUES

       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.

SEE ALSO

       lintian(1)

AUTHOR

       checkbashisms was originally written as a shell script by Yann Dirson <dirson@debian.org>  and  rewritten
       in Perl with many more features by Julian Gilbey <jdg@debian.org>.