shell_script_repo/GETOPTS-SHELL-SCRIPT.txt at master · subhamproject/shell_script_repo · GitHub

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http://www.theunixschool.com/2012/08/getopts-how-to-pass-command-line-options-shell-script-Linux.html

https://www.lifewire.com/pass-arguments-to-bash-script-2200571


https://sookocheff.com/post/bash/parsing-bash-script-arguments-with-shopts/ --> IMP

https://www.shellscript.sh/tips/getopts/


https://sookocheff.com/post/bash/parsing-bash-script-arguments-with-shopts/

while getopts u:d:p:f: option
do
case "${option}"
in
u) USER=${OPTARG};;
d) DATE=${OPTARG};;
p) PRODUCT=${OPTARG};;
f) FORMAT=${OPTARG};;
esac
done


========================================


#!/bin/bash

usage()
{
  echo "Usage: $0 [-s|-r] [ -d DB_DUMP ] [ -f TARBALL ]"
  exit 2
}

set_variable()
{
  local varname=$1
  shift
  if [ -z "${!varname}" ]; then
    eval "$varname=\"$@\""
  else
    echo "Error: $varname already set"
    usage
  fi
}

#########################
# Main script starts here

unset DB_DUMP TARBALL ACTION

while getopts 'srd:f:?h' c
do
  case $c in
    s) set_variable ACTION SAVE ;;
    r) set_variable ACTION RESTORE ;;
    d) set_variable DB_DUMP $OPTARG ;;
    f) set_variable TARBALL $OPTARG ;;
    h|?) usage ;; esac
done

[ -z "$ACTION" ] && usage
[ -z "$DB_DUMP" ] && [ -z "$TARBALL" ] && usage

if [ -n "$DB_DUMP" ]; then
  case $ACTION in
    SAVE) save_database $DB_DUMP ;;
    RESTORE) restore_database $DB_DUMP ;;
  esac
fi

if [ -n "$TARBALL" ]; then
  case $ACTION in
    SAVE) save_files $TARBALL ;;
    RESTORE) restore_files $TARBALL ;;
  esac
fi