Grep command


 
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# 1  
Old 08-08-2011
Grep command

Hi,

I tried different options -i -h and multiple combinations to fix below output while doing grep from a file

Usage: grep -hblcnsviw pattern file . . .

But it didnt work for me... getting same output again and again. Any idea how to fix this.


Thanks,
Ram
# 2  
Old 08-08-2011
could you show us what you actually tried and explain what you are hoping to find in the file...
This User Gave Thanks to Skrynesaver For This Post:
# 3  
Old 08-08-2011
Code:
var1=`cat userids.txt | grep  $id`
name=`echo $var1 | nawk -F"|" '{print $2 }'`

I am just checking whether user id is present in a file called userids.txt and if so, am getting the user name from that file. id and name are separated by delimiter (| )

Last edited by Franklin52; 08-08-2011 at 12:33 PM.. Reason: Please use code tags for data and code samples, thank you
# 4  
Old 08-08-2011
Debug your script with:
Code:
echo "$id"
echo ---------------
var1=`grep "$id" userids.txt`
echo "$var1"
echo ---------------
name=`echo $var1 | nawk -F"|" '{print $2 }'`
echo "$name"

And learn to use 'set -x'
# 5  
Old 08-08-2011
If you are getting a syntax error in that command I suspect that $id is null.

Check that with yazu's debug check above, echoing the command you think you have constructed is generally a good plan.
 
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