i am on learning path of unix, and yet to discover many things. I came across with this requirement where i need to pass parameters but the position of parameters is not fixed so after doing some google search got to know "getopts" can handle that. So here is my code:
Code:
function show_help {
echo "Usage: ${0} -b [bankname] -r [region] -w [windowdate]"
echo ""
echo " -b: BankName"
echo " -r: Region"
echo " -w: Windowdate"
exit 0
}
# A POSIX variable
OPTIND=1 # Reset in case getopts has been used previously in the shell.
# set -x
# Get parameters from command line
while getopts "h?b:r:w:f" opt; do
case "$opt" in
b)
BankName=${OPTARG}
;;
r)
Region=${OPTARG}
;;
w)
WindowDate=${OPTARG}
;;
f)
FilePattern=${OPTARG}
;;
h|\?)
show_help
exit 0
;;
esac
done
shift $((OPTIND-1))
[ "$1" = "--" ] && shift
# If required variables aren't setup, show help and exit
unset MISSING_PARAM
if [[ -z ${BankName} ]]; then
MISSING_PARAM="${MISSING_PARAM} b"
fi
if [[ -z ${Region} ]]; then
MISSING_PARAM="${MISSING_PARAM} r"
fi
if [[ -z ${WindowDate} ]]; then
MISSING_PARAM="${MISSING_PARAM} w"
fi
#if [[ -z ${FilePattern} ]]; then
# MISSING_PARAM="${MISSING_PARAM} f"
#fi
if [[ -n ${MISSING_PARAM} ]]; then
echo "Error: Missing required parameter(s)"
for PARAM in ${MISSING_PARAM}; do
echo " -${PARAM}"
done
echo ""
show_help
exit 0
fi
well, now my requirement is i want to pass optional parameter, kindly note i am not talkin about optional arguments that i am aware of if i dont use ":" after any option it will accept optional argument for that option, but what i need is optional parameter.. so if i call my scripts like:
it does not show any parameter passed to option "-f" because there is no ":" after -f... what i want is out of 4 parameters 3 are mandatory but last one should be non-mandatory so, both should work i.e
# Get parameters from command line
while getopts "b:r:w:f" opt; do
case "$opt" in
b)
BankName=${OPTARG}
;;&
r)
Region=${OPTARG}
;;&
w)
WindowDate=${OPTARG}
;;&
f)
FilePattern="$2"
;;&
b|r|w|f)
shift 2
OPTIND=1
;;
*)
show_help
exit 0
;;
esac
done
I don't think any options are mandatory (that's why they're called what they're called). Mandatory existence needs to be taken care of in the case ... esac construct.
# Get parameters from command line
while getopts "b:r:w:f" opt; do
case "$opt" in
b)
BankName=${OPTARG}
;;&
r)
Region=${OPTARG}
;;&
w)
WindowDate=${OPTARG}
;;&
f)
FilePattern="$2"
;;&
b|r|w|f)
shift 2
OPTIND=1
;;
*)
show_help
exit 0
;;
esac
done
thanks for the suggestion @ctac_
i tried that but it was not giving me desired result as if i give 4 parameters the last parameter i.e. "-f" was taking first parameter's argument so i made some changes and now its working for both cases: here is my final code
Code:
function show_help {
echo "Usage: ${0} -b [bankname] -r [region] -w [windowdate]"
echo ""
echo " -b: BankName"
echo " -r: Region"
echo " -w: Windowdate"
exit 0
}
# A POSIX variable
OPTIND=1 # Reset in case getopts has been used previously in the shell.
# set -x
# Default values
TRG=".TRG"
# Get parameters from command line
while getopts "b:r:w:f" opt; do
case "$opt" in
b)
BankName=${OPTARG}
echo ${OPTIND}
;;
r)
Region=${OPTARG}
echo ${OPTIND}
;;
w)
WindowDate=${OPTARG}
echo ${OPTIND}
;;
f)
FilePattern=$8 #$2 was giving me RBC so ichanged to $8
echo ${OPTIND}
;;
b|r|w|f)
shift 2
OPTIND=1
;;
*)
show_help
exit 0
;;
esac
done
shift $((OPTIND-1))
[ "$1" = "--" ] && shift
# If required variables aren't setup, show help and exit
unset MISSING_PARAM
if [[ -z ${BankName} ]]; then
MISSING_PARAM="${MISSING_PARAM} b"
fi
if [[ -z ${Region} ]]; then
MISSING_PARAM="${MISSING_PARAM} r"
fi
if [[ -z ${WindowDate} ]]; then
MISSING_PARAM="${MISSING_PARAM} w"
fi
#removed -f missing_param check to ignore it when no argument provided to case -f
if [[ -n ${MISSING_PARAM} ]]; then
echo "Error: Missing required parameter(s)"
for PARAM in ${MISSING_PARAM}; do
echo " -${PARAM}"
done
echo ""
show_help
exit 0
fi
so thanks for you reply i got the idea how OPTIND works..let me know if we can tweak it more?
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