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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

Preview

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