sed and awk in shell script

bondoq · 07-03-2006, 03:54 AM

i want to understand and use

sed and awk in the shell script

acid_kewpie · 07-03-2006, 04:02 AM

uh huh. good for you. did you want to ask a question?

raskin · 07-03-2006, 04:09 AM

Well, it's not easy to express desire to have received advice to read man sed, man awk, info sed, info awk, man 7 regex.

titopoquito · 07-03-2006, 04:09 AM

Bash Beginner's Guide:
http://www.tldp.org/LDP/Bash-Beginners-Guide/

Advanced Bash Scripting Guide:
http://www.tldp.org/LDP/abs/html/

Sed oneliners:
http://www.student.northpark.edu/pem...d/sed1line.txt

cs-cam · 07-03-2006, 04:25 AM

I'd like a Double Cheeseburger, extra large Coke and some fri... hey, can you put that in a meal?

titopoquito · 07-03-2006, 04:30 AM

Sure, get it here: http://www.brackenstore.com/images/b...eeseburger.jpg

cs-cam · 07-03-2006, 05:18 AM

Oh man I'm hungry...

acid_kewpie · 07-03-2006, 06:38 AM

ok ok guys, let's get back on track. wasn't the best start to a thread ever, but this is their thread, not yours...

320mb · 07-03-2006, 12:45 PM

Quote:

Originally Posted by bondoq

i want to understand and use

sed and awk in the shell script

Code:

#!/bin/bash
#random-ogg: play a random file from jukebox
mount /dev/hdb8
cd /home/music

filename=$(find -type f | 
     gawk 'BEGIN{ 
     srand() 
}
{     
     names[NR]=$0
}
      END{ i=1+int(rand()*NR)
      print names[i]
} 
')
echo "$filename"
mplayer "$filename"

here is an example of awk/gawk in use......this script looks thru my ogg files and chooses one at random and plays it thru mplayer..........one can also edit it to use xine, xmms, etc and it can choose mp3 files also..........

onlynimal · 07-25-2007, 11:55 PM

hye,

since i'm not able to start a new thread, i'm raising my question here.
I have a variable saying $remaining="/etc /var /sns /vol"(which is assigned at runtime)
i want to check whether '/sns' is present in that. If it is, it should be removed and the string must be like $remaining="/etc /var /vol"
Can I use awk command to do that.
Plz help.Thnx in advance

chrism01 · 07-26-2007, 01:39 AM

Awk by example: http://www-128.ibm.com/developerwork...ry/l-awk1.html

onlynimal · 07-26-2007, 02:15 AM

thanks.
but i want to extract from a string. not from a file..
so i dont think that 'awk' will work for this. can u suggest some other command in shell

pixellany · 07-26-2007, 07:43 AM

Maybe a bit anticlimactic, but my favorite sed and awk tutorials are at:
http://www.grymoire.com/Unix/

frenchn00b · 07-26-2007, 07:58 AM

Quote:

Originally Posted by 320mb

Code:

#!/bin/bash
#random-ogg: play a random file from jukebox
mount /dev/hdb8
cd /home/music

filename=$(find -type f | 
     gawk 'BEGIN{ 
     srand() 
}
{     
     names[NR]=$0
}
      END{ i=1+int(rand()*NR)
      print names[i]
} 
')
echo "$filename"
mplayer "$filename"

here is an example of awk/gawk in use......this script looks thru my ogg files and chooses one at random and plays it thru mplayer..........one can also edit it to use xine, xmms, etc and it can choose mp3 files also..........

That's cool to embed the awk code into the bash. Too, can you do so with perl embeded into bash ?
nice script

btw, this is a nice tuto / book / pdf:
(not in english, sorry)
http://www.bamboo.hc.edu.tw/linux/document/awk.pdf

chrism01 · 07-27-2007, 01:52 AM

Re Perl, sure.
Normally all the Perl progs i write are self-sufficient, but there's no reason you can't call them from within a shell script.
After all, you call them from the cmd line (bash) anyway ...