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Full Discussion: How to remove blank lines
Top Forums Shell Programming and Scripting How to remove blank lines Post 302524982 by bakunin on Wednesday 25th of May 2011 08:59:44 AM
Old 05-25-2011
Quote:
Originally Posted by mayursingru
I tried using
Code:
 sed '/^$/d' filename

but to no avail.

Regards,
Mayur
It might be that "empty" lines are not completely empty but filled with spaces (or other non-printable characters). Try the following:

Code:
sed '/^[<blank><tab>]*$/d' /path/to/input > /path/to/output

Replace "<blank>" and "<tab>" with literal blank/tabulator characters.

Still, the way you presented your expected output was a bit different: you wanted to retain a blank line before every paragraph starting with "Error". To accomplish this try:

Code:
sed '/^[<blank><tab>]*$/d
     /^Error.*$/ s/^/^M/' /path/to/input > /path/to/output

The "^M" is a literal newline. You get it (in vi) by switching to insert-mode, pressing CRTL-V and then ENTER.

I hope this helps.

bakunin
 

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fmt(1)							      General Commands Manual							    fmt(1)

NAME
fmt - format text SYNOPSIS
width] [file...] DESCRIPTION
The command is a simple text formatter that fills and joins lines to produce output lines of (up to) the number of characters specified in the width option. The default width is 72. concatenates the arguments. If none are given, formats text from the standard input. Blank lines are preserved in the output, as is the spacing between words. does not fill lines beginning with a period for compatibility with Nor does it fill lines starting with Indentation is preserved in the output and input lines with differing indentation are not joined (unless is used). can also be used as an in-line text filter for the command: reformats the text between the cursor location and the end of the paragraph. Options recognizes the following options: Crown margin mode. Preserve the indentation of the first two lines within a paragraph and align the left margin of each subsequent line with that of the second line. This is useful for tagged paragraphs. Split lines only. Do not join short lines to form longer ones. This prevents sample lines of code, and other such "formatted" text, from being unduly combined. Fill output lines to up to width columns. WARNINGS
The width option is acceptable for BSD compatibility, but it may go away in future releases. SEE ALSO
nroff(1), vi(1). fmt(1)
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