cshell

Minimal Unix shell with pipes and redirection, in C.

A small, self-contained demo written in pure C — no external libraries, just the standard library and POSIX. Part of the Corg-Labs collection of single-file C programs.

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How It Works

1. A command line is split on the pipe character into stages
2. fork() + execvp() run each stage as a child process
3. pipe() and dup2() wire one stage's output to the next's input
4. < and > redirect a stage's input/output to files

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Build

gcc cshell.c -o cshell

Run

./cshell

Controls

Built-ins: cd, exit. Try ls | grep .c | wc -l or cat < in > out.