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Top Forums UNIX for Dummies Questions & Answers Check for empty line at end of a dynamic header in each file Post 302941435 by Don Cragun on Thursday 16th of April 2015 03:54:46 AM
Old 04-16-2015
Yes, sed writes the results it produces to its standard output. If you want the output saved in a file, you can redirect its output.

What operating system and shell are you using?

All of your sample files have some lines containing <carriage-return> characters. Some (maybe all) of your sample files have some lines that do not contain <carriage-return> characters. If these lines did not contain <carriage-return> characters, the standards would call these blank lines. Are you trying to create output files in DOS format (with all lines terminated by <carriage-return><newline> or are you trying to create output files in UNIX format (no <carriage-return>, just <newline> as the line terminator)?

What is your definition for empty line? The standards define an empty line to be a line that only contains one character (the <newline> character that terminates that line). Some of your files contain lines that only contain lots of <tab> characters terminated by a <carriage-return><newline> character pair. Do you consider that to be an empty line? Some of the DOS format blank lines appear as line 2 or 3 and are followed by other lines that still appear to be part of your headings. Some of your DOS format blank lines appear after what seems to be that file's heading and before that file's data.

Do you want add an empty line to your output file between the 5th and 6th input lines from your input files and also suppress copying all blank lines from your input (after removing <carriage-return>s)?
 

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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 1.8.3.1 06/10/2014 GIT-STRIPSPACE(1)
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