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find and replace

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# 1  
Old 05-07-2012
find and replace
Hi,
I have to grep value from one file, if that value is already present with "#" symbol. I have to remove that symbol in that file.

Ex:
file1.txt contains the following string

#value=15


I have to search for "Value". If I found the string with hash symbol, nee to remove the # in the file1.txt.

Please help on this.

Thanks,
Chelladurai.
# 2  
Old 05-07-2012
Code:
perl -i.bck -pe's/#value/value/' file1.txt

# 3  
Old 05-07-2012
Bug
Code:
cat file1.txt | sed 's/#//g' > temp_file
mv temp_file file1.txt

Moderator's Comments:
Mod Comment Video tutorial on how to use code tags in The UNIX and Linux Forums.
Last edited by radoulov; 05-07-2012 at 10:30 AM..
# 4  
Old 05-07-2012
Hi,
Thanks for your reply. But i need to apply this in my shell scrpt.

Because, I want to validat the string in the file then replace it. Every loop contains different string values.

Like
Code:
perl -i.bck -pe's/#$tempvar/$tmpvar/' file1.txt



Could you please assist on this.... ????
Last edited by Franklin52; 05-07-2012 at 10:54 AM.. Reason: Please use code tags
# 5  
Old 05-07-2012
Code:
# awk '/value/{if($0~/^#/)sub("^#","")}1' file

# 6  
Old 05-07-2012
Quote:
Originally Posted by ckchelladurai
Hi,
Thanks for your reply. But i need to apply this in my shell scrpt.

Because, I want to validat the string in the file then replace it. Every loop contains different string values.

Like
Code:
perl -i.bck -pe's/#$tempvar/$tmpvar/' file1.txt

Could you please assist on this.... ????
Use:

Code:
perl -i.bck -pe's/#$ENV{tempvar}/$ENV{tempvar}/' file1.txt

The variable tempvar must be exported.
# 7  
Old 05-08-2012
Thanks for the reply. Its working fine.... Smilie
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