#!/bin/bashARGS=1        # Number of arguments expected.E_BADARGS=65  # Exit value if incorrect number of args passed.test $# -ne $ARGS && \echo "Usage: `basename $0` $ARGS argument(s)" && exit $E_BADARGS#  If condition 1 tests true (wrong number of args passed to script),#+ then the rest of the line executes, and script terminates.# Line below executes only if the above test fails.echo "Correct number of arguments passed to this script."exit 0# To check exit value, do a "echo $?" after script termination.