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Top Forums Shell Programming and Scripting checking a variable is within range Post 302085368 by vino on Thursday 17th of August 2006 12:43:41 AM
Old 08-17-2006
This will validate a number between 0 and 100 both inclusive.

Code:
[/tmp]$ cat try.sh
#! /bin/sh

echo "Guess my secret number (0-100): "
read GUESS

if [[ $GUESS -ge 0 && $GUESS -le 100 ]] ; then 
  echo "good"
else
  echo "bad"
fi

 

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CONFIG.GUESS(1) 						   User Commands						   CONFIG.GUESS(1)

NAME
config.guess - guess the build system triplet SYNOPSIS
config.guess [OPTION] DESCRIPTION
The GNU build system distinguishes three types of machines, the `build' machine on which the compilers are run, the `host' machine on which the package being built will run, and, exclusively when you build a compiler, assembler etc., the `target' machine, for which the compiler being built will produce code. This script will guess the type of the `build' machine. Output the configuration name of the system `config.guess' is run on. Operation modes: -h, --help print this help, then exit -t, --time-stamp print date of last modification, then exit -v, --version print version number, then exit ENVIRONMENT VARIABLES
config.guess might need to compile and run C code, hence it needs a compiler for the `build' machine: use the environment variable `CC_FOR_BUILD' to specify the compiler for the build machine. If `CC_FOR_BUILD' is not specified, `CC' will be used. Be sure to specify `CC_FOR_BUILD' is `CC' is a cross-compiler to the `host' machine. CC_FOR_BUILD a native C compiler, defaults to `cc' CC a native C compiler, the previous variable is preferred REPORTING BUGS
Report bugs and patches to <config-patches@gnu.org>. Originally written by Per Bothner. Copyright 1992-2016 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
autoconf(1), automake(1), autoreconf(1), autoupdate(1), autoheader(1), autoscan(1), config.guess(1), config.sub(1), ifnames(1), libtool(1). GNU Autoconf 2.69 August 2017 CONFIG.GUESS(1)
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