YNZH/simple-shell

this is a simple shell for Linux

Simple-Shell

this is a simple shell for Linux.

Build:

make

Clean:

make clean

Usage:

cd ./bin
./smpsh

Examples:

NOTES : "$:" is the system shell's symbol, but "# :" is the simple-shell's symbol.

$:ls
Makefile  README.md  bin  src
$:cd ./bin/
$:ls
cat  ls  smpsh  wc

$:./smpsh                       # begin simple-shell
# :ls                           # "$:" is changed as "# :" ,then run custom ls command
   16984 ./cat
   21888 ./smpsh
   16976 ./wc
   17248 ./ls
   4096 .
# :ls | wc                      # test pipe 
5                               # line number of output of 'ls' just is 5, that's ok.
# :ls | wc | wc                 # test multi pipes
1                               # line number of the second pipe's output just is 1. that's ok.
# :ls > out.txt                 # test output redirect form stdout to out.txt.
# :cat out.txt                  # view out.txt 
0    16984 ./cat
1    21888 ./smpsh
2        0 ./out.txt
3    16976 ./wc
4    17248 ./ls
5     4096 .                    # redirect is ok.
6 # :exit                       # exit
$:                              # back to system shell	

Features:

1. support some redirect symbols: {'>', '<', '|'}
2. support run custom simple shell commands whose is implemented basically by me.
3. now just include { wc, cat, exit, quit} commands.

How to add new command:

for example, add a word count(wc) to simple-shell.

1. create a wc.c file.
2. complete wc.c as your interests.
3. move wc.c to src directory.
4. edit Makefile.
5. that's all.