POSIX Shell

shellFish

Installation

g++ shellFish.cpp -o shellFish && ./shellFish

Commands

echo $$

autocompetion using <tab> key.

echo HOST

root user (#) prompt, 
normal user (%) prompt.

PS1="=>"

PS1=DEFAULT

cd ..

cd HOME

cd ~

alarm 4 you are late

cat a.txt | head -4 | tail -3 | sort

cat a.txt > op.txt

cat a.txt | head -4 | tail -3 | sort > op.txt

cat a.txt  >> op.txt

./a.out < input

alias c = cat
### 1. alias: you should type like alias 'll = ls -la'(ignore the quotes, the space should be given as shown)

export a = string
export -p # print all
export -n keyname
### 2. export: type like 'export x = 3'(ignore the quotes, the space should be given as shown), export -p, export -n name

pwd

history

clear

open a.mp4

sleep 100 &

fg jobnumber

cat ok.txt | grep pattern

ls, echo, touch, mkdir, grep, pwd, cd, cat, 

head, tail, chmod, exit, history, clear, cp