Linux Note 1: Command Types and Frequently Used Commands
Internal Command and External Command Internal Command is a part of the Shell program, it consists of some simple Linux system command, which will be recognized by the Shell program and executed within the Shell program. Usually, Shell gets loaded into memory when a Linux system startup. Internal Command is written within bash’s source code, so it run faster than external command as interpreting an internal command does not need to create a new child thread. Some of most common internal command includes exit, history, cd, echo etc. ...