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Top Forums Shell Programming and Scripting Newbie question: modulo operator with negative operand, bug or feature? Post 302951886 by jim mcnamara on Tuesday 11th of August 2015 11:32:33 AM
Old 08-11-2015
Code:
echo "(9-7) % 5 = $(( $(( 9 - 7 )) % 5 )) (should be 2)."
# and
echo "(9-7) % 5 = $(( ( 9 - 7 ) % 5 )) (should be 2)."

Note the spaces.

Both work in bash. /bin/sh does not have to always equal bash, it should a modern POSIX shell. I do not know how /bin/sh evaluates on busybox.
 

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shells(4)							   File Formats 							 shells(4)

NAME
shells - shell database SYNOPSIS
/etc/shells DESCRIPTION
The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser- shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root. A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by the routines which search the file. Blank lines are also ignored. The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/pfcsh, /bin/pfksh, /bin/pfsh, /bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/pfcsh, /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh. Note that /etc/shells overrides the default list. Invalid shells in /etc/shells may cause unexpected behavior (such as being unable to log in by way of ftp(1)). FILES
/etc/shells lists shells on system SEE ALSO
vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4) SunOS 5.10 4 Jun 2001 shells(4)
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