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Shell Programming and Scripting
Replace only if the keyword is the first word in every line
Post 302322507 by alexzubin on Thursday 4th of June 2009 02:34:55 AM
06-04-2009
For some reason the above code does not seem to work.
This is my code:
<--START
a = "This is a print statement
print a
b = "This contains print statement"
print b
END-->
DESIRED:
<--START
a = "This is a print statement
#print a
b = "This contains print statement"
#print b
END-->
Line 4 of the code (print b) should also be commented i.e tabs and space before the first word should be taken care of.
I'm trying to use:
sed 's/[^][pP][rR][iI][nN][tT]/#print/'
sed 's/^[pP][rR][iI][nN][tT]/#print/'
But nothing happens. No part of the code is commented.
If I use:
sed 's/[pP][rR][iI][nN][tT]/#print/'
The first occurence is commented correctly but I want it to be commented only if the line starts with the keyword.
This is my code:
<--START
a = "This is a print statement
print a
b = "This contains print statement"
print b
END-->
DESIRED:
<--START
a = "This is a print statement
#print a
b = "This contains print statement"
#print b
END-->
Line 4 of the code (print b) should also be commented i.e tabs and space before the first word should be taken care of.
I'm trying to use:
sed 's/[^][pP][rR][iI][nN][tT]/#print/'
sed 's/^[pP][rR][iI][nN][tT]/#print/'
But nothing happens. No part of the code is commented.
If I use:
sed 's/[pP][rR][iI][nN][tT]/#print/'
The first occurence is commented correctly but I want it to be commented only if the line starts with the keyword.
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LEARN ABOUT LINUX
git-stripspace
GIT-STRIPSPACE(1) Git Manual GIT-STRIPSPACE(1) NAME
git-stripspace - Remove unnecessary whitespace SYNOPSIS
git stripspace [-s | --strip-comments] < input DESCRIPTION
Clean the input in the manner used by Git for text such as commit messages, notes, tags and branch descriptions. With no arguments, this will: o remove trailing whitespace from all lines o collapse multiple consecutive empty lines into one empty line o remove empty lines from the beginning and end of the input o add a missing to the last line if necessary. In the case where the input consists entirely of whitespace characters, no output will be produced. NOTE: This is intended for cleaning metadata, prefer the --whitespace=fix mode of git-apply(1) for correcting whitespace of patches or files in the repository. OPTIONS
-s, --strip-comments Skip and remove all lines starting with comment character (default #). -c, --comment-lines Prepend comment character and blank to each line. Lines will automatically be terminated with a newline. On empty lines, only the comment character will be prepended. EXAMPLES
Given the following noisy input with $ indicating the end of a line: |A brief introduction $ | $ |$ |A new paragraph$ |# with a commented-out line $ |explaining lots of stuff.$ |$ |# An old paragraph, also commented-out. $ | $ |The end.$ | $ Use git stripspace with no arguments to obtain: |A brief introduction$ |$ |A new paragraph$ |# with a commented-out line$ |explaining lots of stuff.$ |$ |# An old paragraph, also commented-out.$ |$ |The end.$ Use git stripspace --strip-comments to obtain: |A brief introduction$ |$ |A new paragraph$ |explaining lots of stuff.$ |$ |The end.$ GIT
Part of the git(1) suite Git 1.8.5.3 01/14/2014 GIT-STRIPSPACE(1)