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Bourne Shell - OR operator correct usage

Posted on 2011-02-17
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Last Modified: 2012-05-11
hi me again.. gonna be here all night unfortunately.. I seem to be not using the | operator correctly.. i'm hoping someone can help me out


if the user answers with a "y" or "Y" i want it to do something.... well what I wrote works.. but obviously I would like to learn the correct and simplified way of doing it.  I tried it with "n" and "N" but that gives me an error of

line 10: [: missing `]'
line 10: n: command not found



i tried "N"|"n" with no spaces

i also tried [ $answer = "N" ] | [ $answer = "n" ]

couldn't get either to work..
#!/bin/sh
echo "Are you OK?"
read answer
if [ $answer = "y" ]
then
echo yes
elif [ $answer = "Y" ]
then
echo yes
elif [ $answer = "N" | "n" ]
then
echo no
else
echo BOO
fi

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Question by:nocturn4l
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4 Comments
 
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ozo earned 500 total points
ID: 34914017
if [ "$answer" = "N" -o "$answer" = "n" ]
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by:ozo
ID: 34914019
see
man test
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Author Closing Comment

by:nocturn4l
ID: 34914028
thank you... I try not to ask on here unless I've tried several things.. i'm following a book right now and I guess I misread it.. the OR operator | is for arithmetic only i guess?

thanks for the suggestion on looking up "man test". will do that right now
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Expert Comment

by:Tintin
ID: 34923016
The logical OR operator is || not |
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