Shell Programming and Scripting

# sh script -h
calling help function.....

# sh script -f "2011-03-04 1"
Usage: 'sh script -f "<YYYY-MM-DD-HH> <number>"' [for function use]
       'sh script -h'                            [for help]

# sh script -f "2011-03-04-00 6"
processing function with 2011-03-04-00 6........

# cat script
## justdoit ##
 
#!/bin/bash
 
goto_fon () {
if [[ $(echo "$1" | grep -w '[0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}-[0-9]\{2\} [0-9]') ]] ; then
 echo "processing function with $1..."
 echo ".............................."
else
 goto_help ;
fi
}
 
goto_help () {
case "$1" in
   help) echo "viewing help menu....." ;;
   *) echo "Usage: 'sh $0 -f \"<YYYY-MM-DD-HH> <number>\"' [for function use]
       'sh $0 -h'                            [for help] " ;;
   esac
}
 
while getopts  "f:h" opt
do
  case "$opt" in
  f) goto_fon "$OPTARG" ;;
  h) goto_help "help" ;;
  *) goto_help "" ;;
  esac
done