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Spawn a TTY/Pseudo Shell
A terminal is a physical device with a keyboard and screen connected to a computer running various OS types.
A _**tty **_is the UNIX device name for a physical/virtual terminal.
A _shell _is the Unix command interpreter.
A _**console **is a generic term for a primary i/o device or interface. In UNIX, console is where the boot/startup messages are sent to. After bootup the console effectively becomes a _terminal.
//===========================\\
|| Terminal ||
|| |-----------| ||
|| Keyboard--->| Input |-++->|---| |-------|
|| |-----------| || |tty|<=>| shell |
|| |---------|<------++--|---| |-------|
|| Print<--| Output | ||
|| |---------| ||
|| ||
\\===========================//
When you SSH into the machine the SSH program is acting as the terminal, connecting with yet another tty:
//===========================\\
|| SSH ||
|| |----------| ||
|| STDIN------->| Network |-++->|---| |-------|
|| |----------| || |tty|<=>| shell |
|| |---------|<-----++--|---| |-------|
|| STDOUT<--| Network | ||
|| |---------| ||
|| ||
\\===========================//
When you open a terminal on linux a lot of the time you are opening a graphic program which comes with the environment you are. For gnome this would be gnome-terminal:
//===========================\\
|| gnome-terminal ||
|| |----------| ||
|| GDK_p------->| File Wrt |-++->|---| |-------|
|| |----------| || |tty|<=>| shell |
|| |---------|<-----++--|---| |-------|
|| Screen <-| File Rd | ||
|| |---------| ||
|| ||
\\===========================//
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Last modified 8mo ago
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