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Old 04-29-2008, 06:14 AM   #1
ch4920
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help w/ homework


newbie here. i am writing a bash script and when i use wc -l filename to get a line count it returns the line count and the file name. i would like to get the line count only(not the filename) and store it in a variable. also i need to get the process id of the script and store that in a variable too. any help is greatly appreciated. thank you

sorry wrong forum. trying to figure out how to delete

Last edited by ch4920; 04-29-2008 at 06:18 AM.
 
Old 04-29-2008, 06:28 AM   #2
Tinkster
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Quote:
Originally Posted by ch4920 View Post
newbie here. i am writing a bash script and when i use wc -l filename to get a line count it returns the line count and the file name. i would like to get the line count only(not the filename) and store it in a variable.
We don't do homework here, but I'll give you a tip.
There's pipe or redirect as the first set of options,
and e.g. tools like cut or awk as a more brute-force
approach to the problem (removing the excess output).

Quote:
Originally Posted by ch4920 View Post
also i need to get the process id of the script and store that in a variable too. any help is greatly appreciated. thank you

sorry wrong forum. trying to figure out how to delete
Forum is fine ;}

Try
man bash
/\$\$



Cheers,
Tink
 
Old 04-29-2008, 06:28 AM   #3
pixellany
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Welcome to LQ---and thanks for acknowledging homework. You'll get some flak regardless, but your approach has the best chance of getting help.

After the wc command, you can use "cut" to select a specific field. "man cut" for details.

For process ID, try this:
ps -e|grep scriptname

Then use cut to get just the process ID

To put command outputs into variables, there are two forms:
var=`command` (those are backtics, not single quotes)
var=$(command)

to augment whatever text you are using, go to http://tldp.org and get "Bash Guide for Beginners"

Last edited by pixellany; 04-29-2008 at 07:32 AM. Reason: typo--text not test
 
Old 04-29-2008, 06:38 AM   #4
ch4920
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thank you very much
 
Old 04-29-2008, 08:22 AM   #5
Hko
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Quote:
Originally Posted by pixellany View Post
For process ID, try this:
ps -e|grep scriptname
There also is a special variable for this. Simpler, cleaner and faster.
 
Old 04-29-2008, 09:01 AM   #6
fancylad
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Quote:
also i need to get the process id of the script and store that in a variable too. any help is greatly appreciated.
There's also pgrep

Quote:
matt@matt-laptop:~$ sleep 1000 &
[1] 8272
matt@matt-laptop:~$ pgrep sleep
8272
 
  


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