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Full Discussion: starting programmer
Top Forums UNIX for Dummies Questions & Answers starting programmer Post 302582662 by ryran on Friday 16th of December 2011 06:57:38 PM
Old 12-16-2011
In addition to what they said, since you're starting out and already mentioned you're using BASH: Don't use the classic shell builtin '[ expression ]' ; use the shell keyword '[[ expression ]]'. Trust me, it's all-around better, unless you're coding for old busted bourne shell systems.
One benefit: you won't have to worry about putting quotes around your variables, which was part of your problem.

The conditional expression [Bash Hackers Wiki]
 

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let(1)                                                             User Commands                                                            let(1)

NAME
let - shell built-in function to evaluate one or more arithmetic expressions SYNOPSIS
ksh let arg... DESCRIPTION
ksh Each arg is a separate "arithmetic expression" to be evaluated. EXIT STATUS
The following exit values are returned: 0 The value of the last expression is non-zero. 1 The value of the last expression is zero. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
ksh(1), set(1), typeset(1), attributes(5) SunOS 5.10 15 Apr 1994 let(1)
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