2.9 KiB
MOROS Shell
Commands
The main commands have a long name, a one-letter alias, and may have additional common aliases.
Delete file:
> d a.txt
> del a.txt
> delete a.txt
Copy file:
> c a.txt b.txt
> copy a.txt b.txt
Move file:
> m a.txt b.txt
> move a.txt b.txt
Print string:
> p "Hi"
> print "Hi"
Read file:
> r a.txt
> read a.txt
Write file:
> w a.txt
> write a.txt
Write dir:
> write /usr/alice/ # with a trailing slash to create a dir instead of a file
List files in dir:
> list /usr/alice
When executed without arguments, this command will list the files of the current directory.
Go to dir:
> goto /usr/alice
When executed without arguments, this command will print the current directory.
Combiners (TODO)
The & and | symbols are used only for combiners so there's no needs to
double them.
And combiner:
> r a.txt & r b.txt
Or combiners:
> r a.txt | r b.txt
Pipes (TODO)
The pipe symbol | from UNIX is replaced by a thin arrow ->, shortened to
>, and the redirection symbol > from UNIX is replaced by a fat arrow =>
(see below).
Piping the standard output of a program to the write command to emulate a
redirection for example would be -> write or > w in short.
An additional standard stream stdnull(3) is added to simplify writing to /dev/null.
Examples:
Read file A and redirect stdout(1) to stdin(0) of write file B:
> r a.txt > w b.txt
> r a.txt 1>0 w b.txt # with explicit streams
> r a.txt -> w b.txt # with thin arrow
Read file A and redirect stderr(2) to stdin(0) of write file B:
> r a.txt 2> w b.txt
> r a.txt 2>0 w b.txt
Suppress errors by redirecting stderr(2) to stdnull(3):
> r a.txt 2>3 w b.txt
Redirect stdout(1) to stdin(0) and stderr(2) to stdnull(3):
> r a.txt > 2>3 w b.txt
> r a.txt 1>0 2>3 w b.txt
Redirections
Redirecting standard IO streams can be done with a fat arrow, for example the output of the print command can be written to a file like so:
> print hello => /tmp/hello
Which is more efficient than doing:
> print hello -> write /tmp/hello
Variables
- Name of the shell or the script:
$0 - Script arguments:
$1,$2,$3,$4, ... - Process environment variable:
$HOME, ... - Shell environment variable:
$foo, ...
Setting a variable in the shell environment is done with the following command:
> foo = "world"
And accessing that variable is done with the $ operator:
> print $foo
world
> print "hello $foo"
hello world
The process environment is copied to the shell environment when a session is started. By convention a process env var should be in uppercase and a shell env var should be lowercase.