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Full Discussion: Operator test in bash
Top Forums Shell Programming and Scripting Operator test in bash Post 302811571 by AndreiM on Thursday 23rd of May 2013 05:04:15 PM
Old 05-23-2013
Operator test in bash

Hello, can you please help me because I am totally confused with a simple script:
#!/bin/bash
Code:
[[ ((5 > 9)) ]] || [[ ((7 > 10)) ]] && echo "Good Morning" 
[[ ((4 < 1)) ]] || [[ ((2 < 1)) ]] && echo "Good Night"

For me, these two strings are indentical: false || false and there is no point to execute echo command.

But the run result is confusing me:
It is displayed just one string "Good Morning".
Why is it displayed? Smilie

The used OS: Ubuntu 12.04 LTS
Thank you in advance, Best Regards

Last edited by Scott; 05-23-2013 at 06:35 PM.. Reason: Please use code tags
 

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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/ksh93, /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/ksh93, /usr/bin/pfcsh, /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh, and /usr/sfw/bin/zsh. /etc/shells overrides the default list. Invalid shells in /etc/shells could cause unexpected behavior, such as being unable to log in by way of ftp(1). FILES
/etc/shells list of shells on system SEE ALSO
vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4) SunOS 5.11 20 Nov 2007 shells(4)
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