rarakira / minishell

Simple shell project for 21 school (42)

This is a 21 School/Ecole 42 Project. Worked in team with Cflorind

minishell

Coding a simple CLI shell with basic functionality. Subject can be found here.

Project goals

• Understand the way shells work
• Implement redirections, pipes, handle environment variables
• Practice signal handling
• Implement list of builtins

Features

Basics:

• History of previous entered commands
• Search and launch the right executable (based on the PATH variable, using a relative or an absolute path)
• Environment variables ($ followed by a sequence of characters) expand to their values
• Wildcards * in the current working directory
• ctrl-C, ctrl-D and ctrl-\ behave like in bash
• ’ (single quotes - prevent from interpreting meta-characters in quoted sequence)
• " (double quotes - prevent from interpreting meta-characters in quoted sequence except for $)
• $? expands to the last exit status
• | connect cmds or groups with pipes; output of a cmd is connected to the input of the next cmd via a pipe
• && and || with parenthesis for priorities

Builtins:

• echo with option -n
• cd
• pwd without options
• export without options
• unset without options
• env without options
• exit [exit_status] without options

Redirections:

[n] (optional) specifies the file descriptor, if not specified it is stdout/stdin

• [n]< file Redirecting Input
• [n]<< limiter Here Documents
• [n]> file Redirecting Output
• [n]>> file Appending Redirected Output

To compile and run

Run the following commands in Terminal:

# to build
> make

# to run
> ./minishell