UNIX for Dummies Questions & Answers

awk -F: -v key="emailkey2" '
 BEGIN { addrlist=0 }
 $1 ~ key {
   addr=$2
   if (addrlist == 0) {
     addrlist=addr
   } else {
     addrlist=addrlist "," addr
   }
 }
 END { print addrlist }' abc.txt

#!/bin/ksh

key="${1}"

file='abc.txt'

while IFS=':' read keyCurrent addr
do
   if [ "${keyCurrent}" = "${key}" ]; then
      [ "${first}" -eq 0 ] && printf "${addr}" ||  printf ",${addr}"
      first=$(($first + 1))
   fi

done < "${file}"
printf "\n"

sMailGroup='grep ^emailkey1 abc.txt | awk -F":" '{print $NF}'`

$ grep emailkey1 abc.txt
emailkey1:sam@abc.com
emailkey1:tom@abc.com

$ grep emailkey1 abc.txt | cut -d: -f2
sam@abc.com
tom@abc.com

$ grep emailkey1 abc.txt | cut -d: -f2 | paste -s -d,
sam@abc.com,tom@abc.com

#!/usr/bin/python
input = raw_input("Enter email key:" )
all = open("abc.txt").readlines()
email = [items.strip().split(":")[-1] for items in all if input in items]
print "%s:" % input , ','.join(email)

/home:> python test.py
Enter email key:emailkey1
emailkey1: sam@abc.com,tom@abc.com