1CHECKBASHISMS(1)            General Commands Manual           CHECKBASHISMS(1)
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NAME

6       checkbashisms - check for bashisms in /bin/sh scripts
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SYNOPSIS

9       checkbashisms script ...
10       checkbashisms --help|--version
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DESCRIPTION

13       checkbashisms, based on one of the checks from the lintian system, per‐
14       forms basic checks on /bin/sh shell scripts for the  possible  presence
15       of  bashisms.   It  takes the names of the shell scripts on the command
16       line, and outputs warnings if possible bashisms are detected.
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18       Note that the definition of a bashism in this context  roughly  equates
19       to  "a  shell  feature  that is not required to be supported by POSIX";
20       this means that some issues flagged may  be  permitted  under  optional
21       sections of POSIX, such as XSI or User Portability.
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23       In  cases  where POSIX and Debian Policy disagree, checkbashisms by de‐
24       fault allows extensions permitted by Policy but may  also  provide  op‐
25       tions for stricter checking.
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OPTIONS

28       --help, -h
29              Show a summary of options.
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31       --newline, -n
32              Check for "echo -n" usage (non POSIX but required by Debian Pol‐
33              icy 10.4.)
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35       --posix, -p
36              Check for issues which are non POSIX but  required  to  be  sup‐
37              ported by Debian Policy 10.4 (implies -n).
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39       --force, -f
40              Force  each  script to be checked, even if it would normally not
41              be (for instance, it has a bash or non POSIX  shell  shebang  or
42              appears to be a shell wrapper).
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44       --extra, -x
45              Highlight  lines which, whilst they do not contain bashisms, may
46              be useful in determining whether a particular issue is  a  false
47              positive  which  may  be  ignored.   For  example,  the  use  of
48              "$BASH_ENV" may be preceded by checking whether "$BASH" is set.
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50       --early-fail, -e
51              Exit right after a first error is seen.
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53       --version, -v
54              Show version and copyright information.
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EXIT VALUES

57       The exit value will be 0 if no possible bashisms or other problems were
58       detected.  Otherwise it will be the sum of the following error values:
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60       1      A possible bashism was detected.
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62       2      A  file was skipped for some reason, for example, because it was
63              unreadable or not found.  The warning message will give details.
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65       4      No bashisms were detected in a bash script.
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SEE ALSO

68       lintian(1)
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AUTHOR

71       checkbashisms was originally written as a shell script by  Yann  Dirson
72       <dirson@debian.org>  and  rewritten  in Perl with many more features by
73       Julian Gilbey <jdg@debian.org>.
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77DEBIAN                         Debian Utilities               CHECKBASHISMS(1)