CODEWITHSUNDEEP
shellunixsh
user2347191
user2347191

Reputation: 99

How to find out duplicate arguments in shell script

I'm supporting below arguments to the script. I want to find out duplicate arguments when its passed and throw an error. Can you please help me. 

#! /bin/sh
VCFile=
gCFFile=
PW=xyzzy

while test $# -gt 0 
do
  option=$(echo $1 | tr a-z A-Z)
  case $option in

(-VO)    shift
          VCfile=$1
          ;;
(-CON)  shift
          gCFFile=$1
          ;;
(-PASSWORD) shift
          PW=$1
          ;;
(*)     
          print "\nerror -The command line argument $1 is invalid\n"
          print "Testscript has aborted.\n"
          exit 2  
          ;;
   esac
   shift
done

./Install.sh -VO abc.txt -CON tt.txt - pass
./Install.sh -VO abc.txt -CON tt.txt -ss

error -The command line argument -ss is invalid
Testscript has aborted.

if running with dup parameters like below

./Install.sh -VO abc.txt -CON tt.txt -CON ta.txt -PASSWORD ABC -PASSWORD non

--doesn't fail , Here I want to throw an error as duplicate options are entered.

Upvotes: 2

Views: 1189

Answers (2)

William Pursell
William Pursell

Reputation: 212248

Just check if the value has already been set.

#!/bin/sh
unset VCFile
unset gCFFile
unset PW  # set default below

die() { echo "$@"; exit 1; } >&2
while test $# -gt 0 
do
  option=$(echo $1 | tr a-z A-Z)
  case $option in

(-VO)    shift
          test "${VCFile+set}" = set && die -VO set twice
          VCfile=$1
          ;;
(-CON)  shift
          test "${gCFFile+set}" = set && die -CON given twice
          gCFFile=$1
          ;;
(-PASSWORD) shift
          test "${PW+set}" = set && die -PASSWORD given twice
          PW=$1
          ;;
(*)     
          die "error -The command line argument $1 is invalid
          ;;
   esac
   shift
done
: ${PW=xyzzy}  # if -PASSWORD was not given, set a default

Upvotes: 4

Shravan Yadav
Shravan Yadav

Reputation: 1317

You can use below code before while loop.

if [ `echo "$@" | grep -o "\-CON" | wc -l` -gt 0 ] || [ `echo "$@" | grep -o "\-PASSWORD" | wc -l` -gt 0 ] ||  [ `echo "$@" | grep -o "\-VO" | wc -l` -gt 0 ]
then
echo "  Duplicate set of parameter is passed. $# is invalid\n"
echo "Testscript has aborted.\n"
exit 0
fi

OR you can add in case statement to get which parameter is duplicate.

while  test $# -gt 0
do
  option=$(echo $1 | tr a-z A-Z)
  case $option in

(-VO)    shift
          VCfile=$1
          if  [ `echo "$@" | grep -o "\-VO" | wc -l` -gt 0 ]
          then
             echo "Duplicate set of parameter is passed for -VO . Parameters passed are invalid\n"
             echo "Testscript has aborted.\n"
          exit 0
          fi
          ;;
(-CON)  shift
          gCFFile=$1;
          if  [ `echo "$@" | grep -o "\-CON" | wc -l` -gt 0 ]
          then
             echo "Duplicate set of parameter is passed for -CON . Parameters passed are invalid\n"
             echo "Testscript has aborted.\n"
          exit 0
          fi
          ;;
(-PASSWORD) shift
          PW=$1
          if  [ `echo "$@" | grep -o "\-PASSWORD" | wc -l` -gt 0 ]
          then
             echo "Duplicate set of parameter is passed for -PASSWORD . Parameters passed are invalid\n"
             echo "Testscript has aborted.\n"
          exit 0
          fi
          ;;
(*)
          echo "\nerror -The command line argument $1 is invalid\n"
          echo "Testscript has aborted.\n"
          exit 2
          ;;
   esac
   shift
done

let me know if it is working.

Upvotes: 2

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