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removing lines without text

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# 1  
Old 12-15-2011
removing lines without text
How do I remove line that do not contain text, but that do contain tabs?

I have tried the command
Code:
cat file | awk NF

but that doesn't work when the lines contain tabs (and spaces).

I have also tried:
Code:
cat file | sed '/^$/d'

# 2  
Old 12-15-2011
Try sed '/^[:space:]*$/d'.
This User Gave Thanks to CarloM For This Post:
locoroco
# 3  
Old 12-15-2011
You want to remove empty lines?

Code:
awk '!/^[ \t]*$/' input_file

--ahamed
This User Gave Thanks to ahamed101 For This Post:
locoroco
# 4  
Old 12-15-2011
the "empty" lines are still there. They contain tabs and/or spaces. I have no idea how to remove them
# 5  
Old 12-15-2011
Code:
 
grep -v . inputfile > outputfile

This User Gave Thanks to itkamaraj For This Post:
locoroco
# 6  
Old 12-15-2011
Code:
perl -ne '(!/^\s+/)&&print' inputfile

Quote:
Originally Posted by locoroco
the "empty" lines are still there. They contain tabs and/or spaces. I have no idea how to remove them
@locoroco: ahmed101's solution works perfectly.

@CarloM: sed '/^[[:space:]]*$/d'
Last edited by balajesuri; 12-15-2011 at 06:51 AM..
This User Gave Thanks to balajesuri For This Post:
locoroco
# 7  
Old 12-15-2011
Paste the output of cat -A input_file

Are you telling that the file is unchanged? Of course it will not get modified.

Code:
awk '!/^[ \t]*$/' input_file > out_file
 
#or use sed -i to change the file inline
 
sed '/^[[:space:]]*$/d' input_file

--ahamed
Last edited by ahamed101; 12-15-2011 at 07:07 AM..
This User Gave Thanks to ahamed101 For This Post:
locoroco
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