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Bash to exit on no reponse

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# 1  
Old 08-31-2016
Bash to exit on no reponse
The below bash does not seem to exit if the user response is n N no No. Is the synatax incorrect? Thank you Smilie.

Bash
Code:
read -r -p "Is this correct? [y/N] " response
if [[ $response =~ ^([nN][oO)$ ]]
then
    echo "The files do not match"  && exit ;;
else
.... do something
fi

# 2  
Old 08-31-2016
Hello cmccabe,

Could you please try following.
Code:
read -r -p "Is this correct? [yes/No] " response
if [[ $response =~ ([no]||[NO]||[No]||[nO]) ]]
then
    echo "The files do not match"
        exit
else
        echo ".... do something";
fi

It sees for string entered from users like No,nO,NO,no too.

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
cmccabe
# 3  
Old 08-31-2016
Thank you very much, works great Smilie.
# 4  
Old 08-31-2016
Use a case statement:

Code:
read -r -p "Is this correct? [yes/No] " response
case $response in
    [yY] | [yY][Ee][Ss] )
        do something
        ;;

     [nN] | [n|N][O|o] )
        echo "The files do not match"
        exit
        ;;
esac

# 5  
Old 08-31-2016
Maybe the following would give you an example to work from:
Code:
#!/bin/bash
while [ 1 ]
do
	read -r -p "Is this correct? [y/N] " response
	if [[ $response =~ ^[nN][oO]?$ ]]
	then
		echo 'match'  && exit
	else
		echo 'no match'
	fi
done

The RE ^[nN][oO]?$ matches a one or two character string anchored at the start of the string (^) where the first character is a lowercase or uppercase n ([nN]), followed by zero or one (?) lowercase or uppercase o ([oO]), and anchored to the end of the string ($).
# 6  
Old 08-31-2016
or more easily, declare response as a low-case variable: typeset -l response and you don't have to permute all the possible combinations...
This User Gave Thanks to vgersh99 For This Post:
xbin
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