laurells/c_simple_shell

Creation of a simple shell made up of few functions

Description Laurels and Hauwa's Shell is a simple UNIX command interpreter that replicates functionalities of the simple shell (sh). Additional functions are also included. This program was written entirely in C as a milestone project for Holberton School.

Installation Clone this repository into your working directory. For best results, files should be compiled with GCC and the following flags: -Wall -Wextra -Werror -pedantic -Wno-format.

Usage After compilation, the resulting program can run stand-alone, either in interactive or non-interactive mode.

Interactive Mode In interactive mode, simply run the program and wait for the prompt to appear. From there, you can type commands freely, exiting with either the "exit" command or ctrl-D.

Non-Interactive Mode In non-interactive mode, echo your desired command and pipe it into the program like this:

echo "ls" | ./shell In non-interactive mode, the program will exit after finishing your desired command(s).

Included Built-Ins Our shell has support for the following built-in commands:

Command Definition exit [n] Exit the shell, with an optional exit status, n. env Print the environment. setenv [var][value] Set an environment variable and value. If the variable exists, the value will be updated. unsetenv [var] Remove an environment variable. cd [dir] Change the directory. help [built-in] Read documentation for a built-in. The following built-in commands may be supported in future versions:

Command Definition alias Set an Alias. history View the history of the shell. Outside Programs Our shell can run outside programs by typing their absolute paths (/bin/ls) or the executable name (ls), IF their directory is included in the PATH.

Examples $ ls -l total 8 drwxrwxr-x 1 vagrant vagrant Apr 2 13:23 directory_1 drwxrwxr-x 2 vagrant vagrant Apr 2 20:30 directory_2 $ /bin/pwd /home/vagrant/shell $ hello world ./hsh: 1: hello: not found $ help env env: env Print the environment. Included Files main.c - functions for calling the shell and initializing the shell struct shell.c - functions for running the basic shell logic shell_helpers.c - functions for helping the shell run split_string.c - functions for splitting string from the user string_helpers1.c - functions for manipulating strings string_helpers2.c - functions for manipulating strings built_ins.c - functions for built-ins built_in_helpers.c - functions for helping the built-in functions help.c - functions for the help built-in help2.c - functions for the help built-in cd.c - functions for the cd built-in cd2.c - functions for the cd built-in _getenv.c - functions for getting elements from the environment env.c - functions for the env, setenv, and unsetenv built-ins llfuncs1.c - linked list functions llfuncs2.c - linked list functions expansions.c - functions for dealing with the $ expansions check_path.c - functions for checking the path of an executable error_handler.c - functions for dealing with errors free.c - functions for freeing allocated memory holberton.h - header file Credits All code written by Laurels Echichinwo and Hauwa Arogunmasa.