The Linux Command Line Chapter 5
Uncover the fundamentals of Linux commands through this comprehensive guide. Explore various types of commands such as executable programs, built-ins, functions, and aliases. Learn how to utilize tools like 'type,' 'which,' 'help,' 'man,' 'whatis,' 'info,' and 'alias' to enhance your command-line proficiency. Dive into creating composite commands and understanding the critical role commands play in navigating the Linux environment effectively.
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Presentation Transcript
The Linux Command Line Chapter 5 Working With Commands Prepared by Dr. Reyes, New York City College of Technology
What Exactly Are Commands? An executable program such as compiled binaries written in C and C++ or programs written in scripting languages such as the shell, python, ruby, etc. A command built into the shell itself o i.e. cd A shell function. (Covered later in the course) An alias. Commands that we can define ourselves, built from other commands.
type command type - displays the kind of command the shell will execute, given a particular command name
which command which - command used to determine the exact location of a given executable. Only works for executable programs, not built-ins nor aliases
help command help displays basic information about a command
man command man - displays the manual of a command. A manual is a comprehensive documents with all the details and options supported by the command. Very technical documents.
whatis command whatis - displays the name and a one-line description of a man page matching a specified keyword.
info command info - an alternative command to man pages that is more user friendly.
alias command Used to create your own composite commands o Usage: alias name= command1; command2; ; commandN Using alias:
