正确的参数数

Posted 2021-02-24

Tests whether the script has been invoked with the correct number of parameters.

E_WRONG_ARGS=85
script_parameters="-a -h -m -z"
# -a = all, -h = help, etc.
if [ $# -ne $Number_of_expected_args ]
then
   echo "Usage: `basename $0` $script_parameters"
   # `basename $0` is the script's filename.
   exit $E_WRONG_ARGS
fi