LinuxQuestions.org - programming

Any code I post here should be considered experimental and unfinished. Don't use it in a production environment. It is your own responsibility to evaluate the code's fitness for any purpose. Programming isn't done in a vacuum, so be prepared to do your own research and teach yourself to do better.

Most importantly, all your polite critiques, elaborations, and corrections are heartily welcomed.

programming my solutions to various problems in various languages

Selecting fields from a line using "sed"

Posted 12-25-2011 at 12:51 AM by Telengard (Here are some things which I hope will be helpful.)
Updated 12-26-2011 at 10:24 PM by Telengard

Tags sed

Yeah, sed ...

No matter how well I think I know sed, it still manages to bite me more often than serve me. Everything I do know about sed, manuals aside, I learned from other programs like ed, vi, and even awk. What I'm getting to is this: my sed-fu is weak, so don't take anything I say about it at face value. Do your own research and learn better for yourself (which you ought to do regardless).

About portability

I'll be using the --posix option with GNU sed...

Telengard

Member

Posted in newbie faqs, programming

Views 215 Comments 0 Telengard is offline

Selecting fields from a line using "cut"

Posted 12-22-2011 at 06:56 PM by Telengard (Here are some things which I hope will be helpful.)
Updated 12-26-2011 at 10:26 PM by Telengard

Tags cut

using cut to break down text

You can use cut to grab only the data you want from a line of text. Tell cut which groups of characters you are interested in and it will print them. By default cut uses tab characters to break down groups of text from the input file.

NOTE: In the example data files which follow, the strings <TAB> and <SPACE> shall be used to visually distinguish whitespace characters. A tab character is the character generated when you press the...

Telengard

Member

Posted in newbie faqs, programming

Views 355 Comments 0 Telengard is offline

How to kill lines before and after a pattern

Posted 12-21-2011 at 05:45 PM by Telengard (Here are some things which I hope will be helpful.)
Updated 12-21-2011 at 06:27 PM by Telengard

Tags awk

PHP Code:


			
#! /usr/bin/awk -f



# Deletes n lines before pattern and m lines after.

# Intended to be portable.

# It is your own responsibility to evaluate the fitness of this program.



BEGIN {

    # set the following initializers as you please

    # FS=" "

    # OFS=" "

    n=5

    m=3

}



/line 11/ { # insert your desired regex "pattern" between the slashes

    pattern_line=FNR

...

Telengard

Member

Posted in programming

Views 210 Comments 0 Telengard is offline