man > checkbashisms(1)

CHECKBASHISMS(1)                       General Commands Manual                      CHECKBASHISMS(1)

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).

       --lint, -l
              Act  like  a  linter,  for  integration  into a text editor. Possible bashisms will be
              printed in stdout, like so:

              {filename}:{lineno}:1: warning: possible bashism; {explanation}

       --extra, -x
              Highlight lines which, whilst they do not contain bashisms, may be useful in determin‐
              ing 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.

       --early-fail, -e
              Exit right after a first error is seen.

       --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 AT debian.org> and
       rewritten in Perl with many more features by Julian Gilbey <jdg AT debian.org>.

DEBIAN                                    Debian Utilities                          CHECKBASHISMS(1)