XShell

XShell is a simple shell implemented in C, supporting variable assignment, script execution, and environment expansion, all without relying on the system shell.

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Features

• Internal command: exit
• Execution of external commands with arguments
• Shell variable definition and substitution:
  • Assign: name=value
  • Use: $name
  • Remove: unset name
• Automatic export of shell variables to child processes (setenv)
• Execution of .sh scripts (custom format, not bash)
  • Supports arguments via $1, $2, ...
• Variable and argument substitution inside scripts

Buid Instructions

Make sure you have gcc installed, then:

make        # Compiles the shell
make run    # Runs the shell
make clean  # Cleans the executable

• The compiled shell is placed in XShell/bin/my_shell

Project Structure

project-root/
├── Makefile
└── XShell/
    ├── main.c        # Core shell logic
    ├── xvar.c        # Variable management (set, get, unset)
    ├── xvar.h        # Variable definitions & function declarations
    └── bin/          # Output directory for the compiled shell

Usage Example

XShell> myname=Matei
XShell> echo $myname
Matei