[unix] What do 'real', 'user' and 'sys' mean in the output of time(1)?

Real shows total turn-around time for a process; while User shows the execution time for user-defined instructions and Sys is for time for executing system calls!

Real time includes the waiting time also (the waiting time for I/O etc.)

Examples related to unix

Docker CE on RHEL - Requires: container-selinux >= 2.9 What does `set -x` do? How to find files modified in last x minutes (find -mmin does not work as expected) sudo: npm: command not found How to sort a file in-place How to read a .properties file which contains keys that have a period character using Shell script gpg decryption fails with no secret key error Loop through a comma-separated shell variable Best way to find os name and version in Unix/Linux platform Resource u'tokenizers/punkt/english.pickle' not found

Examples related to time

Date to milliseconds and back to date in Swift How to manage Angular2 "expression has changed after it was checked" exception when a component property depends on current datetime how to sort pandas dataframe from one column Convert time.Time to string How to get current time in python and break up into year, month, day, hour, minute? Xcode swift am/pm time to 24 hour format How to add/subtract time (hours, minutes, etc.) from a Pandas DataFrame.Index whos objects are of type datetime.time? What does this format means T00:00:00.000Z? How can I parse / create a date time stamp formatted with fractional seconds UTC timezone (ISO 8601, RFC 3339) in Swift? Extract time from moment js object

Examples related to benchmarking

Why is 2 * (i * i) faster than 2 * i * i in Java? ab load testing Why is reading lines from stdin much slower in C++ than Python? Execution time of C program How to use clock() in C++ Clang vs GCC - which produces faster binaries? How to Calculate Execution Time of a Code Snippet in C++ Which is faster: multiple single INSERTs or one multiple-row INSERT? What do 'real', 'user' and 'sys' mean in the output of time(1)? How do I write a correct micro-benchmark in Java?