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Shell Programming and Scripting
while loop output
Post 302642045 by prabhu_kumar on Thursday 17th of May 2012 12:26:35 AM
05-17-2012
while loop output
Hi I am a beginner to unix
In a shell script i see the below code
Code:
# set admin email so that you can get email
ADMIN=someone@somewhere.com
host=`hostname`
date=`date`
# set alert level 70% is default
ALERT=70
df -h | grep / | grep -v '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while read output;
do
echo $output;
usep=`(echo $output | awk '{ print $1}' | cut -d'%' -f1 )`
partition=`(echo $output | awk '{ print $2 }' )`
if [ $usep -ge $ALERT ]; then
echo "Running out of space \"$partition ($usep%)\" on "$host" as on "$date |
mailx -s "Alert: Almost out of disk space $usep" $ADMIN
fi
doneAs we can see the script is send an alert email to the user when disk space exceeds 70%.
what I could not under stand is below line
Code:
df -h | grep / | grep -v '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while read output;how many times the loop is executed?
please provide any guidance.
thanks
p.
Last edited by Scrutinizer; 05-17-2012 at 03:28 AM.. Reason: Code tags. Removed email address, spelling
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LEARN ABOUT ULTRIX
zgrep
ZGREP(1) General Commands Manual ZGREP(1) NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code: (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. EXIT CODE
2 - An option that is not supported was specified. AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1) ZGREP(1)