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I am writing the bash script which will show the disk usage status. If the size of the filesystem is used more than 95% then that line should be highlighted only one time like below. Basically, I want my script to work same as command df -h but with highlighting maximum disk usage. And other filesystems also should be on output. Here is my script.

readarray -t disk <<< "$(df -h | awk '{print $5}' | tail -n +2 | tr -d %)" for i in "${disk[@]}" do if [ $i -gt 95 ] then df -h | grep --color -E "$i%|$" fi done 
 # df -h Filesystem Size Used Avail Use% Mounted on devtmpfs 3.9G 0 3.9G 0% /dev tmpfs 3.9G 140M 3.8G 4% /dev/shm tmpfs 3.9G 1.8M 3.9G 1% /run tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/mapper/centos-root 128G 107G 15G 96% / tmpfs 3.9G 15M 3.9G 1% /tmp /dev/sda1 453M 179M 247M 42% /boot tmpfs 789M 20K 789M 1% /run/user/42 tmpfs 789M 60K 789M 1% /run/user/1000 /dev/mapper/centos-home 100G 85G 16G 96% /mnt
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This is working for me. You can also color the output if you want.

#! /bin/bash - TXT_BLD=$(tput bold) TXT_RST=$(tput sgr0) IFS= mapfile -t disk < <(df -h | tail -n +2) for line in "${disk[@]}"; do USAGE=$(echo $line | awk '{print $5/1}') if [[ "$USAGE" -gt '95' ]]; then echo "${TXT_BLD}$line${TXT_RST}" else echo "$line" fi done

This will make the line yellow if greater than 85% and red if greater than 95%:

#! /bin/bash - TXT_BLD=$(tput bold) TXT_RED=$(tput setaf 1) TXT_YLW=$(tput setaf 3) TXT_WARN="${TXT_BLD}${TXT_YLW}" TXT_ERR="${TXT_BLD}${TXT_RED}" TXT_RST=$(tput sgr0) IFS= mapfile -t disk < <(df -h | tail -n +2) for line in "${disk[@]}"; do USAGE=$(echo $line | awk '{print $5/1}') if [[ "$USAGE" -gt '95' ]]; then echo "${TXT_ERR}$line${TXT_RST}" elif [[ "$USAGE" -gt '85' ]]; then echo "${TXT_WARN}$line${TXT_RST}" else echo "$line" fi done
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