Question

3

script skipping user input in nested case statement

rated 0 times [ 3] [ 0] / answers: 1 / hits: 2122 / 2 Years ago, fri, october 21, 2022, 8:06:26

I am trying to create a nested case statement in which user input is expected (Y/N). However, the system never waits for the input and always goes to the third option, "Please answer yes or no". Can anyone tell me what I am missing?

Here is the case statement

#!/bin/bash

STATUS=status



find /etc/init.d/* -name '*' -print0 | while IFS= read -r -d '' FILE;

do

if [ "$FILE" != "." -o "$FILE" != ".." ]; then

OUTPUT=$($FILE $STATUS)

case "$OUTPUT" in

    *disabled* )

        echo "Do you wish to start $FILE ?"

        read  yn

        case $yn in

         [yY] | [yY][Ee][Ss] )

                $FILE start

                ;;

         [nN] | [n|N][O|o] )

                ;;

        * )

        echo "Please answer yes or no.";;

        esac

        ;;

       * )

        echo "App $FILE is running"

;;

esac

fi

done

Running under Ubuntu 14.04 LTS

Sample output

App /etc/init.d/reboot is running

App /etc/init.d/resolvconf is running

App /etc/init.d/rsync is running

App /etc/init.d/rsyslog is running

App /etc/init.d/samba is running

App /etc/init.d/samba-ad-dc is running

Do you wish to start /etc/init.d/saned ?

Please answer yes or no.

Answers

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rontablis

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answered 2 Years ago tionverflow · Accepted Answer

You're piping find output to the while loop. The inner read command is reading a line from find's output, not from stdin.

You can restructure like this: send the find output to the while loop on a different file descriptor. This leaves stdin free for the inner read.

while IFS= read -u3 -r -d '' FILE; do

    if [ "$FILE" != "." -o "$FILE" != ".." ]; then

        OUTPUT=$($FILE $STATUS)

        case "$OUTPUT" in

            *disabled* )

                read -p "Do you wish to start $FILE ?" yn

                case $yn in

                    [yY] | [yY][Ee][Ss] ) $FILE start ;;

                    [nN] | [nN][Oo] ) ;;

                    * ) echo "Please answer yes or no.";;

                esac

                ;;

            * ) echo "App $FILE is running" ;;

        esac

    fi

done  3< <(find /etc/init.d/* -name '*' -print0)

This uses a process substitution, instead of a pipe, to read from find