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#!/bin/bash
# file-comparison.sh
ARGS=2 # Two args to script expected.
E_BADARGS=85
E_UNREADABLE=86
if [ $# -ne "$ARGS" ]
then
echo "Usage: `basename $0` file1 file2"
exit $E_BADARGS
fi
if [[ ! -r "$1" || ! -r "$2" ]]
then
echo "Both files to be compared must exist and be readable."
exit $E_UNREADABLE
fi
cmp $1 $2 &> /dev/null
# Redirection to /dev/null buries the output of the "cmp" command.
# cmp -s $1 $2 has same result ("-s" silent flag to "cmp")
# Thank you Anders Gustavsson for pointing this out.
#
# Also works with 'diff', i.e.,
#+ diff $1 $2 &> /dev/null
if [ $? -eq 0 ] # Test exit status of "cmp" command.
then
echo "File \"$1\" is identical to file \"$2\"."
else
echo "File \"$1\" differs from file \"$2\"."
fi
exit 0
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