krishnan-r / a-linux-shell

A prototype linux shell.

Linux Shell - Operating Systems Lab Assignment

Features

• Uses GNU Readline for interactive input and history navigation.
• History Management
  • History is persisted to disk in ~/.oslab_history
  • History expansions and shell builtins.
• Job Management:
  • Running multiple jobs in background.
  • Killing Jobs based on job numbers
• Common shell builtins found in bash.
• Redirecting standard streams to files.

Building from source

gcc main.c -lreadline -Wall -o shell

Documentation

Shell Builtins

• exit - quit shell

exit

• cd - Change directory

cd [directory]

• jobs - List active jobs

jobs

• kill - Kill active Job/Process

kill %[jobid]
kill [pid]

• pwd - Display current directory

pwd

• type - Check type of command - builtin/executable

type [command]

• echo

echo Hello World

• history - List history

history
!!  # run previous command  
!n  # run nth command in history.  
!-n # run nth command from end in history.

• debug - Toggle debug output.

debug

Stream Redirection

Redirect stdin/stdout using > and < operators.

command < infiletxt > outfile.txt