Awk examples !!

[Whitehorse_1]

Hi Admins,

Can somebody gimme good examples (not man pages) for 'awk' usage...

Thxs, WH

[Peter Godron]

Hi,
not clear what you are after, however...

Example of awk useage:
http://www.student.northpark.edu/pemente/awk/awk1line.txt

And for further study:
http://en.wikipedia.org/wiki/AWK_programming_language

[Piergiacomo Perini]

Hi WH,

a little example:

awk â Fâ â â { print $1, $2, $3 }â file_name


-F : Field Separator (in this case is â blankâ ).
So you can select first three column from "file_name" (in "file_name" data are formatted in columns).

Hth
regards
pg

[Piergiacomo Perini]

i beg your pardon, here the right command :

awk â F´ ` `{ print $1, $2, $3 }´ file_di_input

[Piergiacomo Perini]

_today is NOT a good day, for me_

awk -  F´ ` `{ print $1, $2, $3 }´ file_di_input

[OldSchool]

you might also try to get ahold of the book "sed & awk" published by o'reilly

[Pete Randall]

Attached are some examples.


Pete

[James R. Ferguson]

Hi:

I'm not convinced that examples in the abstract are going to be that helpful.

A nice tutorial (*with* examples *and* explanations) can be found here:

http://www.gnu.org/software/gawk/manual/gawk.html

Regards!

...JRF...

[A. Clay Stephenson]

Since you don't even bother to explain what you are trying to do, it's difficult to be very helpful. In any event, a simple search of the Forums for "awk" should yield hundreds (at least) of examples ranging from trivial one-liners to very complex awk scripts.

If you are learning from scratch, I might suggest a Plan B: learn Perl. The learning curve is steeper but the power is much greater.

The O'reilly "sed & awk" is hard to beat and it has a good sectio on regular expressions. RE's are really the key to effectively using awk, sed, or Perl. Perl's RE's are RE's on steroids and make things that might require several steps in awk doable in one step.

[IT_2007]

Here is if you want to grab only volume group names from /etc/lvmtab

strings /etc/lvmtab |grep vg |awk -F "\/" '{print $3}'

which will print only name of volume groups (excludes /dev path)

[Arturo Galbiati]

Hi,

# Show mount points over PCT
bdf|awk -v PCT=90 'NR==1||substr($5,1,index($5,"%")-1)+0>=PCT'
*

# Remove empty files
rm -f $(ll|awk '$9&&!$5 {print "rm -f " $9}')

# See all active Oracle databases info
awk -F: '!/^[#|*]/&&!/^$/&&$3="Y"' /etc/oratab

HTH,
Art

[sajeer_2]

Small one

To print user names from /etc/passwd file,

awk -F ":" '{ print $1 }' /etc/passwd

[Fred Martin_1]

I know you asked for no man pages, etc, however, the book called 'The AWK Programming Language' by AWK's authors is one of the best software manuals ever writtn. Everything you need to know and nothing more than you need.

And, happily, it starts with a simple example and builds to complex programs.

I expect by the time you finish page 30 will be writing just about anything you need, including the one-liners used so often in shell scripts.

Fred

The AWK Programming Language
by Aho, Kernighan and Weinberger
Addison-Wesley Publishing Company

[Geoff Wild]

google "awk examples" reveals over 2000 pages :)

This one has quite a few:

http://sparky.rice.edu/~hartigan/awk.html

Chapter 4 of "Unix Unleashed Internet" is my fav:

http://docs.rinet.ru/UNIXi/ch04.htm

Rgds...Geoff