The Command PATH:
- Most common commands are located in your shell’s “PATH”, meaning that you can just
type the name of the program to execute it.
Example: Typing “ ls” will execute the “ ls” command.
- Your shell’s “PATH” variable includes the most common program locations, such as
/bin, /usr/bin, /usr/X11R6/bin, and others.
- To execute commands that are not in your current PATH, you have to give the complete
location of the command.
Examples: /home/bob/myprogram ./program (Execute a program in the current directory) ~/bin/program (Execute program from a personal bin directory)
- Commands can be run by themselves, or you can pass in additional arguments to make them do
different things. Typical command syntax can look something like this:
command [-argument] [-argument] [--argument] [file]
Examples: ls List files in current directory ls -l Lists files in “long” format ls -l --color As above, with colourized output cat filename Show contents of a file cat -n filename Show contents of a file, with line numbers