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April 05, 2004 (Computerworld) -- The following is excerpted from Wicked Cool Shell Scripts, published by No Starch Press, all rights reserved.
Wicked Cool Shell Scripts is "about making Unix a friendlier, more powerful, and more personal computing environment by exploiting the remarkable power and capabilities of the shell," says author Dave Taylor. "Without writing a single line of C or C++, without invoking a single compiler and loader, and without having to take any classes in program design and methodology, you [can] write dozens of wicked cool shell scripts, ranging from an interactive calculator to a set of scripts that make analyzing Apache log files a breeze."
The script below helps system administrators track down users who are exceeding their system storage limits, and will also automatically notify those users that they've maxed out their disk allocation.
Most system administrators seek the easiest way to solve a problem, and the easiest way to manage disk quotas is to extend the fquota script, Script #39, to include the ability to e-mail warnings directly to users who are consuming too much space.
The Code
#!/bin/sh
# diskhogs - Disk quota analysis tool for Unix; assumes all user
# accounts are >= UID 100. E-mails message to each violating user
# and reports a summary to the screen.
MAXDISKUSAGE=20
violators="/tmp/diskhogs0.$$"
trap "/bin/rm -f $violators" 0
for name in $(cut -d: -f1,3 /etc/passwd | awk -F: '$2 > 99 { print $1 }')
do
echo -n "$name "
# You might need to modify the following list of directories to match
# the layout of your disk. Most likely change: /Users to /home
find / /usr /var /Users -user $name -xdev -type f -ls | \
awk '{ sum += $7 } END { print sum / (1024*1024) }'
done | awk "\$2 > $MAXDISKUSAGE { print \$0 }" > $violators
if ¿ ! -s $violators Á ; then
echo "No users exceed the disk quota of ${MAXDISKUSAGE}MB"
cat $violators
exit 0
fi
while read account usage ; do
cat << EOF | fmt | mail -s "Warning: $account Exceeds Quota" $account
Your disk usage is ${usage}MB, but you have been allocated only
${MAXDISKUSAGE}MB.
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