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Remove leading "#" from a String

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# 1  
Old 05-20-2016
Remove leading "#" from a String
Hi Everyone, i am new to scripting and stuck in something.
Query is : I have a properties file eg. data.properties.
This data.properties have some values
example :
Code:
key1=value1
key2=value2
#key3=value3

as key3 is commented by #.
so i want to write a script , that will remove # from properties file and if i want to add # infront of any value in properties file.
My script should be able to remove # or add # from a particular string.

Thanks in Advance
Last edited by Scrutinizer; 05-20-2016 at 04:47 PM.. Reason: code tags
# 2  
Old 05-20-2016
Hello Raj87ng,

Welcome to forums, please use code tags as per forum rules for commands/codes/Inputs you are showing into your posts. Following may help you in your requirement.
To remove leading # from the Input_file:
Code:
awk '{gsub(/^#/,X,$0);print}' Input_file

To add # into starting of a string.
Code:
awk '{gsub(/^key3/,"#"&,$0);print}' Input_file

I haven't tested both, please do let me know if this helps you.

Thanks,
R. Singh
# 3  
Old 05-20-2016
Remove:
Code:
awk -F= -v key="key3" '$1=="#"key{$1=key}1' OFS='\=' file

Add:
Code:
awk -F= -v key="key3" '$1==key{$1="#"key}1' OFS='\='file


sed versions:
Code:
sed 's/^#\(key3=\)/\1/' file

Code:
sed 's/^key3=/#&/' file

Some sed version have a -i option which changes the file in-place..
Last edited by Scrutinizer; 05-20-2016 at 05:21 PM..
# 4  
Old 05-20-2016
Quote:
Originally Posted by Raj87ng
Hi Everyone, i am new to scripting and stuck in something.
Query is : I have a properties file eg. data.properties.
This data.properties have some values
example :
Code:
key1=value1
key2=value2
#key3=value3

as key3 is commented by #.
so i want to write a script , that will remove # from properties file and if i want to add # infront of any value in properties file.
My script should be able to remove # or add # from a particular string.

Thanks in Advance
With these two versions, using Perl, you could choose either key or value as the criteria.

The key or value goes inside the first set of /.../
Remove #:
Code:
perl -pe  '/value3/ and s/^#//' raj87ng.file
key1=value1
key2=value2
key3=value3

Prefix #:
Code:
perl -pe '/value2/ and s/^/#/' raj87ng.file
key1=value1
#key2=value2
#key3=value3

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