[Shell script] Monitor Disk space

#!/bin/bash
USAGE_SPACE=20

USER=root@localhost

df | grep '[0-9]%' | egrep 'sd|hd' | \

while read line 

do

# if [ `echo $line | awk -F" " '{ print $5 }' | cut -d% -f1` -gt "$USAGE_SPACE" ]; then

# echo "Disk space of `echo $line | awk -F" " '{ print $6}'` belongs to `hostname` is over $USAGE_SPACE%" | mail -s "HD DISK is not enough" $USER

# fi

set -- $line

if [ `echo $5 | cut -d% -f1` -gt $USAGE_SPACE ]; then

echo "Disk space of `echo $6` belongs to `hostname` is over $USAGE_SPACE%" | mail -s "HD DISK is not enough" $USER

fi

done

Remark的部份是小弟以前的做法，利用awk去filter出硬碟使用的百分比與目錄名稱，但拜讀了新書"Linux 網路安全管理與監控"，學到了可透過set --$line方便取出某行的資料為引數使用，好用！