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Full Discussion: while loop output
Top Forums Shell Programming and Scripting while loop output Post 302642059 by neutronscott on Thursday 17th of May 2012 01:11:28 AM
Old 05-17-2012
it is going to read line-by-line the modified output of "df". Each line is read into variable "output" so that you can process them. Therefore it'll be executed for each line of output.


I'm not sure the usefulness of grep /, as I imagine every mount-point starts with / anyway. I see much room for improvement in this code. probably you'd want grep -Ev '^Filesystem|tmpfs|cdrom'. you can simplify so much into the awk process.. since you're not doing anything for entries under the alert level, you can let awk filter that out. read can also split the lines into variables, so you won't have to do echo $output | awk ...

Code:
$ df -h | awk -v "alert=70" '$1 !~ /cdrom|tmpfs/ && 0+$5>alert {print $5, $1 }' |
> while read usep partition; do echo "$partition is $usep full"; done

/dev/xvda2 is 99% full

 

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LEARN ABOUT OSF1

uudemon

uudemon(4)						     Kernel Interfaces Manual							uudemon(4)

NAME

       uudemon.admin,  uudemon.cleanu,	uudemon.hour,  uudemon.poll  -	Administrative shell scripts for polling remote systems, cleaning up spool
       directories, reporting status to the system administrator, and routine invocations of the uuxqt and uusched daemons

SYNOPSIS

       These shell scripts reside in the following directory:
	  /usr/lib/uucp

DESCRIPTION

       All the scripts can be run from the command line or can be run automatically by the cron daemon. To automatically run the  scripts,  remove
       the comment character (#) from the beginning of the relevant line in the /var/spool/cron/crontabs/uucp file.

       This  script  reports  status  to  the system administrator. It issues the uustat command to find out the status of uucp jobs. It mails the
       results to the uucp login ID. The script may be modified to send mail to any login ID such as the uucp administrative login ID  (uucpa)	or
       root.  This script cleans up the /var/spool/uucp and /var/spool/uucppublic directories by running the uucleanup command. The uucleanup com-
       mand is run with the following parameters: -C7, -D7, X2, -o2, -W1.  This script runs the uusched and uuxqt daemons in the background.  This
       script  polls  the  systems  listed  in	the  /usr/lib/uucp/Poll file.  The uudemon.poll script should be scheduled before the uudemon.hour
       script. This allows uudemon.poll to create any command files before cron runs the uudemon.hour script.

FILES

       Contains the uudemon.admin, uudemon.cleanu, uudemon.hour and uudemon.poll files.  Contains the uucp file.

RELATED INFORMATION

       Commands: cron(8), uucleanup(8), uusched(8), uuxqt(1)

       Files: /usr/lib/uucp delim off

																	uudemon(4)
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