1 : mv-if-diff file1 file2
2 : move file1 to file2 if file1 and file2 are different.
4 if test $# -lt 2 ; then
5 echo "usage: $0 file1 file2"
6 echo "move file1 to file2 if file1 and file2 are different."
9 if cmp $1 $2 >/dev/null 2>&1; then
10 echo "File $2 not changed."