>./jira -h

----------jira options----------
Required:
-d [data/issueID]
-u [username] -> [username] is your JIRA username
-p [password] -> [password] is your JIRA password

Optional:
-q -> quiet, i.e. no output to console
-h -> help menu

>./jira -u jsimmons

----------jira options----------
Required:
-d [data/issueID]
-u [username] -> [username] is your JIRA username
-p [password] -> [password] is your JIRA password

Optional:
-q -> quiet, i.e. no output to console
-h -> help menu

#!/bin/bash

#using getopts to parse options
while getopts ":hqd:u:p:" opt; do
        case $opt in
                h)
                        help="true"
                        ;;
                q)
                        quiet="true"
                        ;;
                d)
                        data=$OPTARG
                        ;;
                u)
                        username=$OPTARG
                        ;;
                p)
                        password=$OPTARG
                        ;;
                ?)
                        echo "Invalid option: -$OPTARG" >&2
                        ;;
                :)
                        echo "Option -$OPTARG requires an argument." >&2
                        ;;
        esac
done

#check if required options have been set
if [[ -n $data && -n $username && -n $password ]]; then

        wget -q
            --http-user=$username
            --http-passwd=$password
            --header="Content-Type: application/json" [URI]


        #placing issue info into variable

        response=$(< $data)


        #using heredoc to run python script
        #python script uses regular expressions to find the value of the field
        #customfield_10701 ie the branch version

        output=$(python - <<EOF
import re

matchObj = re.search(
     r'(?<=customfield_10701":").*(?=","customfield_10702)',
     '$response',
     re.I
)
if(matchObj):
        print(matchObj.group())

EOF
)


        #writes branch version in .txt file

        echo $output>branchversion.txt


        #prints the branch version if the quiet option hasn't been set
        if [ -z $quiet ]; then
                echo "-------------------------------------------"
                echo ""
                echo "The branch version for issue $data is:"
                cat branchversion.txt
                echo ""
        fi

        #removes file that wget creates containing all data members for the issue

        rm $data
elif [ -n $help ]; then
        #if help option has been set
        echo ""
        echo "----------jira options----------"
        echo "Required:"
        echo "-d [data/issueID]"
        echo "-u [username] -> [username] is your JIRA username"
        echo "-p [password] -> [password] is your JIRA password"
        echo ""
        echo "Optional:"
        echo "-q -> quiet, i.e. no output to console"
        echo "-h -> help menu"
        echo ""
        #http GET data members for issue
else
        #if not all required options or help have been set
        echo "Error: Missing argument(s)"
        echo "Usage: ./jira [option(s)] -d [data] -u [username] -p [password]"
        echo ""
        echo "Try: ./jira -h for more options"
fi

if [ ... ]; then #posix compliant condition tests

if [[ ... ]]; then #extended condition tests

> if [ -n $unsetVar ];then echo yes ; fi
yes
>

> if [ -n "$unsetVar" ];then echo yes ; fi
>

> if [[ -n $unsetVar ]];then echo yes ; fi
>

#!/bin/bash

URI='...whatever...'

usage() {
# print optional error message and help message and exit.

[ -z "$*" ] || printf "%snn" "$*"
# or, if you don't want help printed with every error message:
# [ -z "$*" ] || printf "%snnUse -h option for help.n" "$*" && exit 1

cat >&2 <<__EOF__
----------jira options----------
Required:
  -d [data/issueID]
  -u [username] -> [username] is your JIRA username
  -p [password] -> [password] is your JIRA password

Optional:
  -q -> quiet, i.e. no output to console
  -h -> help menu
__EOF__

exit 1
}

quiet=''

#using getopts to parse options
while getopts ":hqd:u:p:" opt; do
  case $opt in
     h) usage ;;
     q) quiet='true' ;;
     d) data="$OPTARG" ;;
     u) username="$OPTARG" ;;
     p) password="$OPTARG" ;;
    ?) usage "Invalid option: -$OPTARG" ;;
     :) usage "Option -$OPTARG requires an argument." ;;
  esac
done

# check for required options

[ -z "$data" ]     && usage '-d is required'
[ -z "$username" ] && usage '-u is required'
[ -z "$password" ] && usage '-p is required'

# your embedded python overkill could easily be done with `sed`
# or `awk`.   or maybe `jq` as the wget output is json.
# but without a sample of the input I can't provide a guaranteed
# working example.  The awk script below is a first attempt at
# extracting the value of `customfield_10701`

wget -q --http-user="$username"
        --http-passwd="$password"
        --header='Content-Type: application/json'
        -O -
        "$URI" |
  awk -F': ' '/"customfield_10701"/ {
                gsub(/[",]/,"",$2);
                print $2
              }' > branchversion.txt

# alternatively, if you have `jq` installed, try piping wget's
# output through something like `jq -r .customfield_10701` instead of awk.

#prints the branch version if the quiet option hasn't been set
if [ -z "$quiet" ]; then
  echo "-------------------------------------------"
  echo ""
  echo "The branch version for issue $data is:"
  cat branchversion.txt
  echo ""
fi