HalfShell

Compile

gcc shell.c -o w4118_sh
./w4118_sh
别问makefile, 问了就是懒得写了

Function

1. The shell should run continuously, and display a prompt when waiting for input. e.g $/bin/ls -lha /home/w4118/my_docs
2. The shell should read a line from stdin one at a time
3. After parsing and lexing the command, your shell should execute it. A command can either be a reference to an executable OR a built-in shell command.

Examples

1. cd [dir]
2. history [-c] [number]
3. history (without arguments) displays the last 100 commands the user ran, with an offset next to each command
4. history -c clears the entire history, removing all entries.
5. !! executes the most recent command in history.
6. !string executes the most recent command in history starting with string.
   $cd /home/w4118
$/bin/ls
my_file.txt
$history
0 cd /home/w4118
1 /bin/ls
2 history
$!/
my_file.txt
$!his
0 cd /home/w4118
1 /bin/ls
2 history
3 /bin/ls
4 history
$history -c
$history
6 history
$

说明

OS的HW1，最后还是选了分布式，还剩下pipe功能没写，下学期选了的话再写吧。。。。。。