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Shell Programming and Scripting

using OR in IF loop

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# 1  
Old 07-28-2011
Question using OR in IF loop
Hello,

Do we have an availability to use OR(|) in IF loop for comparision

Ex: I have script which will take one arugument..so while running i will give as
Code:
./example.sh one

In code I have taken this arugument in variable and have to compare this with another like

Code:
if( a = one | two)
then
a=fllower
else 
a=book
fi

I am unable to use the OR (|) in IF loop in shell script....can anyone help me please


Thanks in advance
Moderator's Comments:
Mod Comment Please start using [CODE] tags, and start a new thread if the question is not related to the original post
Last edited by pludi; 07-28-2011 at 08:43 AM..
# 2  
Old 07-28-2011
Posix shell:
Code:
if [ "$a" = one ] || [ "$a" = two ] ; then
...
fi

Last edited by yazu; 07-28-2011 at 09:51 AM..
# 3  
Old 07-28-2011
Another way with ksh or bash (with extglog option set) :
Code:
if [[ "${a}" == @(one|two) ]]

Jean-Pierre.
This User Gave Thanks to aigles For This Post:
clx
# 4  
Old 07-28-2011
Just to correct the typo, its extglob

You can enable it with shopt -s extglob and disable shopt -u extglob


Other useful options are:
Code:
?(pattern-list)
	Matches zero or one occurrence of the given patterns
*(pattern-list)
	Matches zero or more occurrences of the given patterns
+(pattern-list)
	Matches one or more occurrences of the given patterns
@(pattern-list)
	Matches one of the given patterns
!(pattern-list)
	Matches anything except one of the given patterns


Thanks to aigles for the post which forced me to dig more and learned something new :-)
# 5  
Old 07-28-2011
you can use -o for OR and -a for AND
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