Shell script to take multiple user input in single file

Question

A shell script should take multiple condition in single line input and it should take one end of input character to perform next operation. ie.

#!/bin/bash
#Functions are defined here 1 2 3 4 5


echo "choice"
echo 
echo "[1] one"
echo "[2] two"
echo "[3] three"
echo "[4] four"
echo "[5] five"
echo
read -p "Enter choice:  " ch
        if [ "$ch" = "1" ]; then
        function_1
        else
        if [ "$ch" = "2" ]; then
        function_2
        else
        if [ "$ch" = "3" ]; then
        function_3
        else
        if [ "$ch" = "4" ]; then
        function_4
        else
        if [ "$ch" = "5" ]; then
        function_5
fi
fi
fi
fi
fi

now say end of input taking denoted by 'e' hence if I execute the .sh file and in "Enter choice"

$Enter choice: 1 3 5 e

it should execute 1 3 and 5th function one by one how to do that?

Maximiliano Padulo · Accepted Answer · 2014-09-15 12:42:09Z

6

You can iterate over all the choices until you find the 'end of input':

read -p "Enter choice:  " ch

for choice in $ch; do
    [ "$choice" == 'e' ] && break
    eval function_$choice
done

NOTE: eval will assemble a command from the arguments and then execute it through the shell

edited Sep 15, 2014 at 12:42

answered Sep 15, 2014 at 11:50

Maximiliano Padulo

1,52211 silver badges23 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Oni1 · Accepted Answer · 2014-09-15 12:02:04Z

1

You should iterate over your string ch until "e" appears:

#!/bin/bash
#Functions are defined here 1 2 3 4 5


echo "choice"
echo 
echo "[1] one"
echo "[2] two"
echo "[3] three"
echo "[4] four"
echo "[5] five"
echo
read -p "Enter choice:  " ch

for i in ${ch}
do
  if [ "$i" == "1" ]; then
    function_1
  else if [ "$i" == "2" ]; then
    function_2
  else if [ "$i" == "3" ]; then
    function_3
  else if [ "$i" == "4" ]; then
    function_4
  else if [ "$i" == "5" ]; then
    function_5
  else if [ "$i" == "e" ]; then
    break
fi
fi
fi
fi
fi
fi

but the answer of mxlian is "cleaner". i just corrent your code..

answered Sep 15, 2014 at 12:02

Oni1

1,5152 gold badges20 silver badges41 bronze badges

Comments

DS. · Accepted Answer · 2014-09-15 12:30:23Z

0

It would be better if you made each input parameter an option and used getopts ie

myProg.sh -a aArg -b bArg -c cArg

Inside myProg.sh:

while getopts "a:b:c" option
do
    case $option in
    a) function_1;;
    b) function_2;;
    c) function_3;;
    *) exitFunc "Incorrect argument";;   # You need to write exitFunc()
    esac
done

This way you can have a missing option ie only option a and c (no b). If you do it your way and one parameter is missing (or null) say paramater 3 then parameter 4 becomes parameter 3 etc.

edited Sep 15, 2014 at 12:30

answered Sep 15, 2014 at 12:14

DS.

6122 gold badges7 silver badges24 bronze badges

Collectives™ on Stack Overflow

Shell script to take multiple user input in single file

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related