Bash Template

#/bin/bash
#set -x
set -e

usage()
{
cat <<EOF
Usage:
`basename $0` [OPTIONS] <non-option arguments>

Purpose:
　　xxxxxxxxxxxx

Description:
　　None

Parameters:

　　OPTIONS
　　　　-i image -- images, registry:2 by default
　　　　-p -- host port, 5000 by default

　　<non-option arguments>

Author:
　　anor@xxxx.com

Revision:
　　2016-07-04 Anor Initial Versiona

EOF
exit 1
}

############################################
#declare options string including optional
#argument names separated from withsapce.
#g_opt_name includs optional arg names
#g_opt_<g_opt_name>, just holds optional arg value
#for example,
# Given optional args, -i, -p,
# the option arg variables respectivly should be as,
# g_opt_i
# g_opt_p
############################################
declare -a g_opt_names=(i: p:)

############################################
#init_args()
#initialize arguments before set them with
#command line values
############################################
init_args()
{
g_opt_i="registry:2" # the registry image from hub.docker.com
g_opt_p=5000
}

############################################
#parse_non_option_args()
#parse non option arguments here
############################################
parse_non_option_args()
{
#//TODD add your code to parse non-option arguments here.

return 0;
}

############################################
#main()
#add business logics in this [main] function
############################################
main()
{
#//TODD add your bussiness code here

return 0;
}

#*******************************************************
########################################################
### Common functions here
########################################################
#*******************************************************
parse_args()
{

#check if showing usage
if [ "$1" ==  "--help" ]; then usage; fi

init_args

parse_options "$@"

parse_non_option_args "$@"
}
parse_options()
{
local opt_names="${g_opt_names[@]}"

local opt_string="$(echo -e "$opt_names" | tr -d '[[:space:]]')"

log "opt_string=$opt_string"

if [ -n "$opt_names" ]; then
while getopts $opt_string opt
do
for i in "${g_opt_names[@]}"
do
local opt_name=${i:0:1}
local opt_var_name=g_opt_$opt_name
case $opt in
$opt_name )
if [ -z "$OPTARG" ]
then
eval $opt_var_name=1
else
eval $opt_var_name=\"$OPTARG\"
fi
log "$opt_var_name=${!opt_var_name}"
;;
h ) usage ;;
\?) usage ;;
esac
done
done
fi
}

#Purpose:
#   echo log message
#
#Parameters:
#   @1.... -- log messages
#
log()
{
echo "[`date +'%Y-%m-%d %H:%M:%S'` $0]" "${@:1}"
}

_main()
{

#parse optional
parse_args "$@"

#main routine
main "$@"

#successful log
log "Done!"
}

_main "$@"