time - run programs and summarize system resource usage
syntax $ time [options] [command]
Real: This is the actual time taken by the processor of the computer to execute the command from pressing the button to complete the command. User: CPU time that is taken by the user mode. SYS: This is the time taken by the system or the Kernel to execute the command.
To calculate execution time of commands $ time sleep 5 $ time free -h $ time df -Th $ time ping google.com
To display the time in portable POSIX format $ time -p sleep 5 $ time -p free -h $ time -p df -Th $ time -p ping google.com
To calculate the update time $ time sudo apt update
To save the time command output in the text file $ /usr/bin/time -o sleep_output.txt sleep 5 $ /usr/bin/time -o df_output.txt df -Th
To get detailed summary of the executed time $ /usr/bin/time -v sleep 5 $ /usr/bin/time -v df -Th $ /usr/bin/time -v free -h
regards, T.Dhanasekar