lab1
....\123
....\456
....\456456
....\789
....\a.out
....\cat
....\cat.c
....\chmod
....\chmod.c
....\date
....\date.c
....\echo
....\echo.c
....\hello
....\hello.c
....\help
....\help.c
....\history
....\history.c
....\kill
....\kill.c
....\ls
....\ls.c
....\makefile
....\mkdir
....\mkdir.c
....\more
....\more.c
....\readme.txt
....\rm
....\rm.c
....\rmdir
....\rmdir.c
....\time
....\time.c
....\wc
....\wc.c
....\who
....\who.c
....\wzl_mysh
....\wzl_mysh.c