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Top Forums Shell Programming and Scripting Number some lines discard others? Post 302753235 by jeppe83 on Tuesday 8th of January 2013 09:33:41 AM
Old 01-08-2013
Number some lines discard others?

Hi,
I'd like to do an operation on text with a format like this

Code:
this line shall be numbered
     this line shall not be numbered
this line shall also be numbered
     this line shall not not be numbered

And I want an output like this
Code:
1 this line shall be numbered
     this line shall not be numbered
2 this line shall also be numbered
     this line shall not not be numbered

nl numbers each line, and I can't seem to find a way for nl to discard lines beginning with spaces/tabs or any other specified set of characteristics.

Any solution is much appreciated. Thank you for reading!
 

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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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