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Appending # to the start of specific line in a properties file

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# 1  
Old 09-15-2011
Error Appending # to the start of specific line in a properties file
Hi,
I have the following file,

ABC.txt:
Code:
ABC=123
DEF=234
FGH=345

Based on my validation and conditional processing it is observed that i need to comment or append # before DEF=234

so the same file ABC.txt should look as follows
Code:
ABC=123
#DEF=234
FGH=345

Sorry if its a repost/wrong section... this is my first post.
Please help me out here...

Thanks in advance,
Mihir

Moderator's Comments:
Mod Comment Please use [code] and [/code] tags when posting code, data or logs etc. to preserve formatting and enhance readability, thanks. See also PM.
Last edited by zaxxon; 09-15-2011 at 08:42 AM.. Reason: code tags, see pm
# 2  
Old 09-15-2011
Everything is fine, just use code tags when you post code, data or logs etc. thanks Smilie

If "DEF=234" is the only identifier to match, you can try:
Code:
sed 's/^DEF=234/#&/' infile

# 3  
Old 09-15-2011
Error Appending # to the start of specific line in a properties file
I dont want starts with, i want it to be something like,
I want to search 234 value and append # to the same line which contains the string 234

for instance
Code:
ABC=123
DEF=234
EFG=2356
DFGT=234

should be updated to
Code:
ABC=123
#DEF=234
EFG=2356
#DFGT=234

Can you help me out on this?

Sorry for the confusion earlier... It seems i failed to phrase the proper query.
# 4  
Old 09-15-2011
Code:
$ nawk '{if ($0~/234/) {print "#"$0}else {print $0}}' infile

# 5  
Old 09-15-2011
No worries, I think I missed that point^^
Code:
sed 's/.*234.*/#&/' infile
ABC=123
#DEF=234
EFG=2356
#DFGT=234

Edit:
And the awk line a tad shorter:
Code:
awk '/234/ {print "#"$0; next}1' infile

# 6  
Old 09-15-2011
Code:
 
$ perl -lane 'if($_ =~ /234/){print "#$_";}else{print $_}' test
ABC=123
#DEF=234
EFG=2356
#DFGT=234

# 7  
Old 09-16-2011
Code:
sed '/234/s/^/#/' infile

Code:
awk '/234/{$0="#"$0}1' infile

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