有趣的rm -rf

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先放一段Bash记录在这里：

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root@enabling-clam:~# mkdir testdir && cd testdir && ls -la
total 0
drwxr-xr-x 1 root root  0 Jul  8 06:35 .
drwx------ 1 root root 52 Jul  8 06:35 ..

root@enabling-clam:~/testdir# mkdir mydir1 && echo "Test1" > myfile1 && echo "Test2" > mydir1/myfile2 && ls -la
total 4
drwxr-xr-x 1 root root 26 Jul  8 06:36 .
drwx------ 1 root root 52 Jul  8 06:35 ..
drwxr-xr-x 1 root root 14 Jul  8 06:36 mydir1
-rw-r--r-- 1 root root  6 Jul  8 06:36 myfile1

root@enabling-clam:~/testdir# echo "foolish rm" > "-rf" && ls -la
total 8
-rw-r--r-- 1 root root 11 Jul  8 06:37 -rf
drwxr-xr-x 1 root root 32 Jul  8 06:37 .
drwx------ 1 root root 52 Jul  8 06:35 ..
drwxr-xr-x 1 root root 14 Jul  8 06:36 mydir1
-rw-r--r-- 1 root root  6 Jul  8 06:36 myfile1

root@enabling-clam:~/testdir# rm * && ls -la
total 4
-rw-r--r-- 1 root root 11 Jul  8 06:37 -rf
drwxr-xr-x 1 root root  6 Jul  8 06:37 .
drwx------ 1 root root 52 Jul  8 06:35 ..

root@enabling-clam:~/testdir# rm -rf && ls -la
total 4
-rw-r--r-- 1 root root 11 Jul  8 06:37 -rf
drwxr-xr-x 1 root root  6 Jul  8 06:37 .
drwx------ 1 root root 52 Jul  8 06:35 ..

root@enabling-clam:~/testdir# rm "-rf" && ls -la
total 4
-rw-r--r-- 1 root root 11 Jul  8 06:37 -rf
drwxr-xr-x 1 root root  6 Jul  8 06:37 .
drwx------ 1 root root 52 Jul  8 06:35 ..

root@enabling-clam:~/testdir# rm "./-rf" && ls -la
total 0
drwxr-xr-x 1 root root  0 Jul  8 06:38 .
drwx------ 1 root root 52 Jul  8 06:35 ..
root@enabling-clam:~/testdir#