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How to put output of one command into a variable

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# 1  
Old 03-31-2010
How to put output of one command into a variable
Hi,
Let say I have these 3 files (state, list and myscript). I want to be able get the sample output like below when I run myscript. Any one know how to fix the code? TIA.


~~~~~~~~~~~~~~~

Code:
> cat /home/state
CA
 
> cat /home/list
CA 100 50 20
AUS 120 61 10
 
> cat myscript
#!/bin/sh
st='cat /home/state'
grep $st /home/list
 
> ./myscript    # this is the output I want.
CA 100 50 20

Last edited by Franklin52; 03-31-2010 at 04:32 AM.. Reason: Please use code tags.
# 2  
Old 03-31-2010
Quote:
Originally Posted by joker_789us
Hi,
Let say I have these 3 files (state, list and myscript). I want to be able get the sample output like below when I run myscript. Any one know how to fix the code? TIA.


~~~~~~~~~~~~~~~

Code:
> cat /home/state
CA
 
> cat /home/list
CA 100 50 20
AUS 120 61 10
 
> cat myscript
#!/bin/sh
st='cat /home/state'
grep $st /home/list
 
> ./myscript    # this is the output I want.
CA 100 50 20

If your grep allows the -f flag, then you could do this

Code:
#!/bin/sh
grep -f /home/state /home/list

# 3  
Old 03-31-2010
How do I get/compare the $st value, in "if-then" statement?

Code:
> cat myscript1
#!/bin/sh
st='cat /home/state'
if [ $st == "CA" ]
then
   do_this
else
   do_that
fi

Last edited by pludi; 03-31-2010 at 05:57 AM.. Reason: code tags, please...
# 4  
Old 03-31-2010
Try this:

Code:
#!/bin/sh
st='cat /home/state'
if [ "$st" = "CA" ]
then
do_this
else
do_that
fi

Last edited by pludi; 03-31-2010 at 06:10 AM.. Reason: code tags, please...
# 5  
Old 03-31-2010
I tried that before. it will run the "do_that" part, instead of "do_this".
If I add a line after "do_that" e.g. echo "$st", I got "cat /home/state" (without the double quote).

Code:
> ./myscript1
cat /home/state
¨

Last edited by vbe; 03-31-2010 at 07:31 AM.. Reason: code tags
# 6  
Old 03-31-2010
Try this
st=`cat /home/state`
instead of
st='cat /home/state'
# 7  
Old 03-31-2010
Great! it works.
Thanks to Jairaj and Vino.
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