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Layer 3


PsychOS

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SKS Survival

PsychOS user guide

Useful key combinations:

ctrl-shift-c inside PsychOS will cancel text input or stop certain programs.

ctrl-shift-r will soft-reboot the machine, preserving the content of /tmp

The lush shell

lush is the default shell of PsychOS. It allows executing functions in memory, programs on disk and Lua typed directly into lush, in order of preference.

The default prompt is [<user>@<hostname> <current directory>]$

When you enter a command, lush will first check for functions with the given name.
If there's no function with the name, it will check for a files with the name in every directory in the PATH environment variable.
If lush can't find a file with that name, it will try to execute the line as Lua.

So, if one were to enter

ps

lush checks for a function called ps, which in this case, it finds, and executes:

PID User Name
3 superu logflushd
4 superu ncd
5 superu tty[randomstringabcd]: 8f01b7c7,89734f0
6 superu kbd: 1f46ed58
7 superu kbd-clibboard: 1f46ed58
8 superu login manager: randomstringabcd

Okay, but what if there was no function?
You enter

count

and there's no function called count, but there is a file called count.lua in the current directory:

for i = 1, 5 do
print(i)
end

lush will look for the function, not find it, see the file, and try to execute it:

1 2 3 4 5

And last, if you enter the Lua code:

for i = 1, 5 do print(i) end

lush will look for a function called for and not find it (magic is involved to make this sane), a file named for or for.lua, not find it, then fall back to executing Lua:

1 2 3 4 5

Last updated at 2018/02/17 00:02 for version ac27dc4