6 tty - A command line interface
tty is a simple command line interface program where keystrokes are collected and interpreted. Completed lines are sent to the shell for interpretation. There is a simple history mechanism, which saves previous lines. These can be edited before sending them to the shell.
tty is started when Erlang is started with the command:
tty operates in one of two modes:
normal mode, in which lines of text can be edited and sent to the shell.
shell break mode, which allows the user to kill the current shell, start multiple shells etc. Shell break mode is started by typing Control G.
In normal mode keystrokes from the user are collected and interpreted by tty. Most of the emacs line editing commands are supported. The following is a complete list of the supported line editing commands.
Note: The notation C-a means pressing the control key and the letter a simultaneously. M-f means pressing the ESC key followed by the letter f. Home and End represent the keys with the same name on the keyboard, whereas Left and Right represent the corresponding arrow keys.
|Home||Beginning of line|
|C-a||Beginning of line|
|End||End of line|
|C-e||End of line|
|C-g||Enter shell break mode|
|C-u||Backward kill line|
|C-n||Fetch next line from the history buffer|
|C-p||Fetch previous line from the history buffer|
|C-w||Backward kill word|
|C-y||Insert previously killed text|
tty enters shell break mode when you type Control G. In this mode you can:
Kill or suspend the current shell
Connect to a suspended shell
Start a new shell