Command/Subcommand Bash Script Template

command.sh

#!/bin/bash
VERSION="0.1"
DESCRIPTION="Command/Subcommand line script template"

usage() { 
  echo "Usage: $0 [ subcommand [-c num] ] [-v]" 1>&2; exit 1; 
}                                                                                                 

subcommand() {
  local OPTIND
  OPTIND=2
  while getopts ":c:" opt; do                                                       
    case "${opt}" in                                                                      
      c) 
        cl=${OPTARG}
        echo "${cl}"                                                                                                                         
        ;;                                                                                                                                                      
    esac                                                                                
  done
  shift $((OPTIND-1))
}


default() {
  local OPTIND
  while getopts ":v" opt; do                                                       
    case "${opt}" in                                                                      
      v)   
        echo -e "${DESCRIPTION}, Version v${VERSION}"                                                                                                                          
        ;;                                                                                                                                                      
    esac                                                                                
  done
  shift $((OPTIND-1))
  usage
}


case "$1" in                                                                                            
  validate)                                                                                     
    subcommand "$@"                                                                        
    ;;                                                                                                                                                            
  *)                                                                                     
    default "$@"                                       
    exit 1                                                                             
    ;;                                                                                 
esac