Simple Shell gsh

A beginner-friendly shell project implemented in C. This shell supports fundamental commands, output redirection, command repetition, and batch file processing.

Features

• Built-in Commands:

  • cd <path>: Change the current directory to <path>.
  • exit: Terminate the shell session.
  • path <dir1> <dir2> ...: Update the shell's search PATH with specified directories.

• Executable Commands: Run commands from directories listed in the PATH, defaulting to /bin/.

• Loop Command: Execute a command multiple times.

  • loop <number> <command>: Repeat <command> a specified <number> of times.

• Background Execution: Use & to run commands in the background.

• Batch File Mode: Execute commands from a file provided as an argument.

Usage Example

To compile and run the shell, use the following commands:

gcc -o gsh gsh.c
./gsh

gsh> path /bin /usr/bin /opt/bin
/bin
/usr/bin
/opt/bin
gsh> rm output.txt
gsh> ls -l > output.txt
gsh> loop 5 echo "Running in a loop"
"Running in a loop"
"Running in a loop"
"Running in a loop"
"Running in a loop"
"Running in a loop"
gsh> exit