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Help Requested regarding indirect acces of variable

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mirzaaur
 PostPosted: Thu May 26, 2011 12:27 pm   

Joined: Thu May 26, 2011 12:12 pm
Posts: 2
Hi all,
I am stuck :-/ ....!!
Question:

how to read value of a variable when a part of the name of variable is a another variable!!?

I need to access a variables set by different process with common name of variable with indexed extension.

for example:

"x" is a env variable set by process.
i=1 (i use for loop to increment from 1 to all possible values for example 5)
x1=5577
x2=5578
x3=5579
.....
can i use echo $x$i to get the value of 5577, 5578 ... ???

thanks in advance for any suggestion,

cheers,
Mirza
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Watael
 PostPosted: Thu May 26, 2011 1:42 pm   

Joined: Mon Mar 02, 2009 3:03 am
Posts: 534
Hi,

already seen here:
Code:
x1=5577
x2=5578
x3=5579
for i in {1..3}; do other="x$i"; echo "${!other}"; done
you can ask web search engine for 'indirection'
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mirzaaur
 PostPosted: Thu May 26, 2011 1:44 pm   

Joined: Thu May 26, 2011 12:12 pm
Posts: 2
Dear Watael,
thanks a lot for your reply. yes its exactly what i was looking for..... got it
thanks once again
cheers,
Mirza
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Patsie
 PostPosted: Thu May 26, 2011 2:09 pm   
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Joined: Sun Jun 27, 2010 12:57 am
Posts: 192
Personally I'd go for
Code:
for i in {1..3}; do eval echo \$x$i; done
But that must be a matter of opinion :)
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choroba
 PostPosted: Thu May 26, 2011 4:51 pm   
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Joined: Tue Apr 27, 2010 2:28 pm
Posts: 172
Location: Czech Republic
Also, if you are using just numbers as the changing part of variable names, you might find arrays more suitable:
Code:
x=([1]=5577 5578 5579)
for i in {1..3}; do echo ${x[i]}; done
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