checker

UNIX[1].shell范例精解(第4版)_code

#!/bin/bash
# Scriptname: checker
# Purpose: Demonstrate function and arguments 

function Usage { echo "error: $*" 2>&1; exit 1; }

if (( $# != 2 )) 
then
	Usage "$0: requires two arguments"
fi
if [[ ! ( -r $1 && -w $1 ) ]]
then
	Usage "$1: not readable and writeable"
fi
echo The arguments are: $*   
# <  Program continues here >