Shell Programming and Scripting

#!/bin/bash
set -xv
#Current Time Stamp
CURR_TS=$( date +"%Y%m%d%H" )
FILE_TS=$( cat /tmp/curr_ts.txt 2> /dev/null ) # Time stamp in file
#admin email account
ADMIN=abc@test.com
# set usage alert threshold
THRESHOLD=60
#hostname
HOSTNAME=$(hostname)
#mail client
MAIL=/bin/mail
# store all disk info here
EMAIL=""
for line in $(df -hP | egrep '^/dev/' | awk '{ print $6 "_:_" $5 }')
do
        part=$(echo "$line" | awk -F"_:_" '{ print $1 }')
        part_usage=$(echo "$line" | awk -F"_:_" '{ print $2 }' | cut -d'%' -f1 )
        if [ $part_usage -ge $THRESHOLD -a -z "$EMAIL" ];
        then
                EMAIL="$(date): Running out of diskspace on $HOSTNAME\n"
                EMAIL="$EMAIL\n$part ($part_usage%) >= (Threshold = $THRESHOLD%)"
        elif [ $part_usage -ge $THRESHOLD ];
        then
                EMAIL="$EMAIL\n$part ($part_usage%) >= (Threshold = $THRESHOLD%)"
        fi
done
if [ -n "$EMAIL" ] && [ "$CURR_TS" -eq "$FILE_TS" ];
then
        echo -e "$EMAIL" | $MAIL -s "Alert: Partition(s) almost out of diskspace on $HOSTNAME" "$ADMIN"
 else
       echo $CURR_TS > /tmp/curr_ts.txt;
fi

if [ -n "$EMAIL" ] && [ "$CURR_TS" -ne "$FILE_TS" ];

#!/bin/bash
set -xv
#!/bin/sh

echo $CURR_TS > curr_ts.txt; # replace it with /tmp/curr_ts.txt