Public bug reported:
The only reason showfsck uses #!/bin/bash instead of #!/bin/sh is
arithmetic evaluation.
The line NB=$(($MMC - $MC + 1)) in /usr/sbin/showfsck can be changed to
NB=$(expr $MMC - $MC + 1) to make the script shell-agnostic.
/usr/bin/expr is in coreutils package, which has priority 'required'
both in Ubuntu and Debian.
** Affects: showfsck (Ubuntu)
Importance: Undecided
Status: New
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No need to be bash-specific
https://bugs.launchpad.net/bugs/188070
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