Replacing the Spaces

Amey Joshi · #1 (**permalink**) 11-10-2008

Hi,

i have a tab dilimeted file.The records are :header is having column names.I am facing the following issue :
I want to convert the spaces only for header file into "_" in the unix shell but the problem is that if i use sed command all the blank spaces are getting replaced by "_".
For example:head -1 samlpe.txt
EMP ID EMP NAME EMP DETAIL EMP CONTACT EMP LOCATION
Want to Convert into
EMP_ID EMP_NAME EMP_DETAIL EMP_CONTACT EMP_LOCATION

Can anybody help regarding this?
Thanks in Advance!

joeyg · #2 (**permalink**) 11-11-2008

Code:

echo $header | sed "s/EMP /EMP_/g"

Yogesh Sawant · #3 (**permalink**) 11-11-2008

using perl:

Code:

perl -pi -e 's/EMP /EMP_/g  if ($. == 1);' filename

sivakumar.rj · #4 (**permalink**) 11-11-2008

Can you explain in detail how perl works and what is the benefit of perl when compared to sed and awk commands.......

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