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How do i tell my bash shell script to test the output of a command against something


 
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# 1  
Old 10-23-2009
How do i tell my bash shell script to test the output of a command against something

How do i tell my bash shell script to test the output of the command i'm using?? I want this script to look for lines not equal to 1 then let me know..

Code:
$ cat blah ; echo ---- ; cat blah.sh
1 fe
1 fi
1 fo
0 fum
1 blahda
1 blah
0 blahh
1 bla
1 bl
1 blahhh 
----
#!/bin/bash 

while read LINE 
do
echo $LINE | grep 1 | cut -c 1
  if [ ??? -eq 1 ]; then
        echo > /dev/null  
  else
        echo "line is not 1"
fi
done<blah
$

# 2  
Old 10-23-2009
to do it your way, just put the result of your 'echo' line in a variable:
Code:
VAR=`echo $LINE | grep 1 | cut -c 1`
if [ $VAR -eq 1 ]

but depending on your requirement, it might be quicker to do this, which will return all the lines in 'blah' that don't contain '1':
Code:
grep -v 1 blah

 

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