Linux shell 中多个命令的源代码，如：CP,RM,SU ,UNAME ,mv ,pwd ,ln ,cut ,touch ,unlink, stat ,rmdir ,mkdir等终端命令的源代码-Linux shell commands in multiple source code, such as: CP, RM, SU, UNAME, mv, pwd, ln, cut, touch, unlink, stat, rmdir, mkdir and other terminal com