/*???????操作系統練習1：?myshell.c??
???????????姓名：?楊富強
???????????學院：通信工程?
???????????學號：01051312?
??????????在Ubuntu7.10和cygwin下已經測試通過
*/?

#include?“myshell.h“?

int?main?（int?argc?char?*argv[]）
{
????char?buf?[MAX_BUFFER]?pwd?[MAX_ARGS];????//?line?buffer
????char?shell_path[MAX_ARGS]=“shell=“;
????char?readme_path[MAX_ARGS]=“readme_path=“;
????char?newpath[MAX_ARGS*1000];
?????int?len;??
???strcpy（newpathgetenv（“PATH“））;
???strcat（newpath“:“）;
?????if（strcmp（argv[0]“./myshell“）&&strcmp（argv[0]“myshell“））?
?????????{?????????????????
??????????????len=strlen（argv[0]）;??
????????????while（len&&argv[0][len]!=‘/‘）???len--?;?
????????????argv[0][len]=‘\0‘;???????????
???????????strcpy（pwdargv[0]）;????
???????????get_fullpath（pwd?argv[0]）;??
?????????????printf（“%s\n“pwd）;??
????????????}
???
???????else??strcpy（pwd??getenv（“PWD“））;????
??????strcat（newpathpwd）;???//?strcat（newpathgetenv（“PWD“））;?????
?????setenv（“PATH“newpath1）;//?add?the?current?working?directory??in?the?“PATH“?environment?variable?to?search?for?the?filename?specified.
???
?????strcat（shell_pathpwd）;???//??strcat（shell_path?getenv（“PWD“））;
????strcat（shell_path“/myshell“）;
????putenv（?shell_path）;?//add?the?working?directory??of?myshell?in?the?environment?variables???????????
??????strcat（readme_path?pwd）;??//???strcat（readme_path?getenv（“PWD“））;//????
???????strcat（readme_path“/readme“）;?????????
??????putenv（readme_path）;?//???add?the?filepath?of?the?file?“readme“??in?the??environment?variables?see?function??my_help（?）?!?
??????
????if（argc>1）??//?也許用戶直接在終端輸入??./myshell?a.bat??>c.txt?
	{
	???strcpy（buf“myshell?“）;
	???int?i;
	???for（i=1;i	???{
		???strcat（bufargv[i]）;
	???????strcat（buf“??“）;
	???}
	???Execute（buf）;//?execute?this?command，??執行這個批處理命令
	}

	else??//?如果用戶在終端輸入?./myshell
	{
	???my_clear（?）;
???????????fprintf（stderr?“Welcome?Enter?myshell!\nType?\“help\“?to?see?the?help?information.\n“）;??????????
	???my_shell（stdinNULLNULL）;
	?}
????return?0?;?
}????//?end??function?“main“?

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????188??2008-06-17?12:39??myshell_for_linux\makefile

?????文件???????2118??2008-06-17?12:39??myshell_for_linux\myshell.c

?????文件???????2265??2008-06-17?12:39??myshell_for_linux\myshell.h

?????文件??????11840??2008-06-17?12:39??myshell_for_linux\readme

?????文件??????40643??2008-06-17?12:39??myshell_for_linux\utility.c

?????文件?????371200??2009-04-27?14:29??操作系統實驗報告.doc

?????目錄??????????0??2010-11-02?23:24??myshell_for_linux

-----------?---------??----------?-----??----

???????????????428254????????????????????7