Fish

fish is a smart and user-friendly command line shell for OS X, Linux, and the rest of the family.

Syntax overview

Shells like fish are used by giving them commands. Every fish command follows the same simple syntax.

A command is executed by writing the name of the command followed by any arguments.

Example:

echo hello world

calls the echo command. echo is a command which will write its arguments to the screen. In the example above, the output will be 'hello world'. Everything in fish is done with commands. There are commands for performing a set of commands multiple times, commands for assigning variables, commands for treating a group of commands as a single command, etc.. And every single command follows the same simple syntax.

If you want to find out more about the echo command used above, read the manual page for the echo command by writing:

man echo

man is a command for displaying a manual page on a given topic. The man command takes the name of the manual page to display as an argument. There are manual pages for almost every command on most computers. There are also manual pages for many other things, such as system libraries and important files.

A big list of custom fish commands is available at the Commands page.

Futher documentation can be found at their website..