LinuxCommandImplementation

Description

Implementation of following linux commands from scratch in C:

• cut
• grep

This program runs on a terminal, with detailed instructions given below.

Requirements

• GCC compiler
• UNIX based terminal

Usage

scut (simplified version of Cut)

• Run make clean to remove all existing compiled files
• Run make to compile latest version of the scut executable.
• To run the executable, we have to give it input stream to cut from. It can be done by piping the output of some commands like cat, ls,etc.
• Command format: `[Piping input] | scut [feature] [range]
• feature:
• -l: columns for the cut selections are on a per-character basis
• -w: the cut selection columns will be separated by any whitespace (spaces or tabs)
• -c: cut selection columns will be separated by commas
• range:
• 1,3,4: Comma separated input implies individual colums
• 3-8: Hyphen seperated input implies range between the two numbers.
• This program supports mix of comma seperated input and hyphen separated input as long as they are in ascending order and not overlapping