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Top Forums UNIX for Dummies Questions & Answers 'awk' help for script to clean out wireless. Post 302931134 by Don Cragun on Saturday 10th of January 2015 10:49:22 PM
Old 01-10-2015
Quote:
Originally Posted by Lord Lien
Thank you for that Don Smilie You are a star Smilie Worked like a charm.

The reason I used "awk" as I have a script that removes printers (code below) & that worked fine. So I was kinda of scratching my head so to speak.

Code:
#!/bin/sh
# Removes ALL printers on that machine
for printer in `lpstat -p | awk '{print $2}'`
do
echo Deleting $printer
lpadmin -x $printer
done
exit 0

There is an extra space in line 3.
I'm not sure what "There is an extra space in line 3." is referring to.

Note that awk is a fairly expensive program to use this way. Since read is a shell built-in, it is usually faster and uses fewer system resources to do the above with something like the previous example:
Code:
#!/bin/sh
# Removes ALL printers on that machine
lpstat -p | while read junk printer junk
do	echo "Deleting $printer"
	lpadmin -x "$printer"
done
exit 0

Note that I use the name junk for variables used by read for fields that I won't be using later as a convention to make it clear that I don't care what is in those fields. Some people use a variable named ignore, x, or _ for this. The name isn't important; just use something that makes it clear to you (when you look at this code again a year from now) what is being done.
This User Gave Thanks to Don Cragun For This Post:
 

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