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sed not removing leading zeroes

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# 1  
Old 03-24-2010
sed not removing leading zeroes
I have th following file
Code:
 
0000000011
0000000001
0000000231
0000000001
0000000022

noow when i run the following command

Code:
 
sed  's/^0+//g' file name

I receive the same output and the leading zeroes are not removed from the file . Please let me know how to achieve this and also the reson for which the above command is not working
Last edited by pludi; 03-24-2010 at 08:34 AM..
# 2  
Old 03-24-2010
Code:
sed 's/^0*//' file

# 3  
Old 03-24-2010
Quote:
Originally Posted by asalman.qazi
...
[CODE]
sed 's/^0+//g' file name
[CODE]
... and also the reson for which the above command is not working
Well, the reason the command doesn't work is because POSIX recognizes just two regex flavors - BREs (Basic Regular Expressions) and EREs (Extended Regular Expressions), and POSIX programs support one flavor or the other.
sed supports BREs. The quantifiers "+" and "?" are metacharacters of EREs, and hence they are not supported by sed.

HTH,
tyler_durden
# 4  
Old 03-24-2010
Code:
$ sed '/0//g' filename

should do it in this case.
# 5  
Old 03-24-2010
Quote:
Originally Posted by agn
Code:
$ sed '/0//g' filename

should do it in this case.
But this will remove all occurence of 0's in the line, not the leading.
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