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How Not to Delete Words that matches a PATTERN

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# 1  
Old 04-25-2012
How Not to Delete Words that matches a PATTERN
Hi,
I have a test file name test.txt with its contents
Code:
string
21345
qwee
strinn
strriin
striin

i need to delete all the words except the word STRING
I used the command
Code:
cat test.txt | sed 's/^.[^tr].*[^g]$/**/g'

but the output entries still contain
Code:
strinn
strriin
striin.

Plz Help me out.

Moderator's Comments:
Mod Comment How to use code tags
Last edited by Franklin52; 04-25-2012 at 06:25 AM.. Reason: Please use code tags
# 2  
Old 04-25-2012
careful with the mv command, you are overwriting the test.txt
Code:
 
grep "string" test.txt > output.txt
mv output.txt test.txt

# 3  
Old 04-25-2012
Are u looking for this ?
Code:
 
sed -n '/string/p' test.txt

# 4  
Old 04-25-2012
Try this,
Code:
awk '/string/{print}' test.txt

Regards,
Indu
# 5  
Old 04-25-2012
Quote:
Originally Posted by Indumathy
Try this,
Code:
awk '/string/{print}' test.txt

Regards,
Indu
just for a information.

no need to use {print}

Code:
 
awk '/string/' test.txt

# 6  
Old 04-25-2012
This will not match words like "stringent" or "outstring".

Code:
grep -xF "string" infile

The -F is not really necessary, here but it will speed up grep and allow for characters like "." to retain its usual meaning.


These will also allow for white space before and after the word:
Code:
grep -wF "string" infile

Code:
awk '$1==s' s="string" infile

Last edited by Scrutinizer; 04-25-2012 at 07:02 AM..
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