Linux Shell Scripting Cookbook - Third Edition

How to do it...

Here's the code:

 #!/bin/bash #Filename: disklog.sh #Description: Monitor disk usage health for remote systems logfile="diskusage.log" if [[ -n $1 ]] then logfile=$1 fi # Use the environment variable or modify this to a hardcoded value user=$USER #provide the list of remote machine IP addresses IP_LIST="127.0.0.1 0.0.0.0" # Or collect them at runtime with nmap # IP_LIST=`nmap -sn 192.168.1.2-255 | grep scan | grep cut -c22-` if [ ! -e $logfile ] then printf "%-8s %-14s %-9s %-8s %-6s %-6s %-6s %s\n" \ "Date" "IP address" "Device" "Capacity" "Used" "Free" \ "Percent" "Status" > $logfile fi ( for ip in $IP_LIST; do ssh $user@$ip 'df -H' | grep ^/dev/ > /tmp/$$.df while read line; do cur_date=$(date +%D) printf "%-8s %-14s " ...