SEATURTLE(1) General Commands Manual SEATURTLE(1)
NAME
SeaTurtle - A simple shell built in python3.7.2
SYNOPSIS
python3 myshell.py [file]
DESCRIPTION
SeaTurtle is a simple command line shell written in Python3.7.2, which also has functionality allowing it to execute
batch commands. It features a number of built-in commands as well as being compatible with all other UNIX commands,
provided they are installed.
USAGE
Options
python3.7 myshell.py [file]
Executes the commands in the file and then exits the shell.
Shell Commands
dir [path/to/directory|< filename] [> filename|>> filename]
Returns the contents of the given directory, or prints the current directory if no argument is given.
clr
Clears the terminal
echo comment|< filename [> filename|>> filename]
Prints the comment back out to the terminal.
cd [path/to/directory|< filename]
Changes the current directory to the given one, or displays the current path if none is given.
environ [> filename|>> filename]
Returns all environment variables and their respective values.
pause
Pauses use of the shell until the return key is pressed.
quit
Closes the shell
Subprocesses
Process [< filename] [> filename|>> filename] [&]
If the given command is not a built-in function of the shell, it will be executed as a child process, for exam‐
ple python3 foo.py is perfectly valid and will execute as normal.
Using & at the end of the line will cause the process to be forked and the shell will return to the prompt after
executing said process.
I/O Redirection
command < <filename>
Uses the contents of the given file as input for the command.
command >> <filename>
Appends the output of the command to the given file, or, if the file doesn't exist, it will make one using the
name provided to it.
command > <filename>
Overwrites data in the given file with the output of the command, or, if the file doesn't exist, it will make
one using the name provided to it.
SOURCES
https://stackoverflow.com/questions/12495218/using-user-input-to-call-functions
http://www.jonwitts.co.uk/archives/896
https://docs.python.org/3/library/readline.html
https://docs.python.org/3/library/getpass.html
https://docs.python.org/3/library/subprocess.html
AUTHOR
Sean Moloney 17477122
V1.0 2019-3-27 SEATURTLE(1)