Learning watch command with examples!

watch date

watch -d date

watch -n 10 df -h

watch -t date

watch echo "'"'$$'"'"

watch echo $$

watch -n 0.5 echo $$

watch -n 1 'ps -e -o pid,uname,cmd,pmem,pcpu --sort=-pmem,-pcpu | head -15'

watch -d -n 1 ifconfig

watch -n 1 tail /var/log/messages

watch -d=cumulative date

watch "du -h filename.txt && df -h"

watch -e "! date |grep -m 1 \"Dec\""

watch -n 1 sed 's/A/Ravi/g' file1.txt