Update the script and add the logic to detect and warn the user if the disk usag

Question

Update the script and add the logic to detect and warn the user if the disk usage is above 80%

#! /bin/bash

LOGFILE="diskusage.log"

if [[ -n $1 ]]
then
   $LOGFILE=$1
fi

if [ ! -e $LOGFILE ]

then

   printf "%-10s %-14s %-10s %-6s %-6s %-6s %-6s " "Date" "IP Address" "Device" "Capacity" "Used" "Free" "Percentage" > $LOGFILE
fi

IP_LIST="10.10.10.2"
(
for ip in $IP_LIST;
do
   ssh client@$ip 'df -H' | grep ^/dev/ > /tmp/$$.df
   while read line;   
   do
   cur_date=$(date +%D)
   printf "%-10s %-14s" $cur_date $ip
   echo $line | awk '{ printf( "%-10s %-6s %-6s %-6s %-6s ", $1,$2,$3,$4,$5);}'
   done < /tmp/$$.df
done
) >> $LOGFILE

Explanation / Answer

*******************************************Script************************************************

#! /bin/bash

dt=`date +%D`

df -h > /tmp/$$.df
  
LOGFILE="diskusage.log"
if [[ -n $1 ]]
then
$LOGFILE=$1
fi
if [ ! -e $LOGFILE ]
then
printf "%-10s %-14s %-10s %-6s %-6s %-6s %-6s " "Date" "IP Address" "Device" "Capacity" "Used" "Free" "Percentage" > $LOGFILE
fi
IP_LIST="10.10.10.2"
(
for ip in $IP_LIST;
do
ssh client@$ip 'df -H' | grep ^/dev/ > /tmp/$$.df
while read line;   
do
//cur_date=$(date +%D)
printf "%-10s %-14s" $dt $ip

//code which is responsible to detect disk uses 80%+

echo -n "$dt $line ";;
echo -n "$dt "
echo $line | awk '{print $4}';;
echo -n "$dt "
echo $line | awk '{print $1,$5}';;
done < /tmp/$$.df
done
) >> $LOGFILE

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