用命令ls-al显示出文件testfile的描述为-rwxr-xr--1 root root 599jun1017：12testfile，由此可知文件testfile的类型为()。

A.[ptname@localhost/~]$ls–a

B.[ptname@localhost/~]$ls–al

C.[ptname@localhost/~]$ls–ff

D.[ptname@localhost/~]$ls

A.`-rwxrwxrwx2hel-susers56Sep0911:05goodbey

B.`-rw-rw-rw-2hel-susers56Sep0911:05hello

C.drwxr--r--1helusers1024Sep1008:10zhang

D.lrwxr--r--1helusers2024Sep1208:12cheng

A.grep'？'TESTFILE

B.grep'….'TESTFILE

C.grep'^？$'TESTFILE

D.grep'^….$'TESTFILE

A.ls–a

B.ls–t

C.ls–l

D.ls–R

A.ls

B.hadoop -ls

C.hadoop ls

D.hadoop fs -ls

A.-rwxrwxrwx 2 hel-s users 56 Sep 09 11:05 goodbey

B.lrwxr--r-- 1 hel users 2024 Sep 12 08:12 cheng

C.`-rw-rw-rw- 2 hel-s users 56 Sep 09 11:05 hello

D.drwxr--r-- 1 hel users 1024 Sep 10 08:10 zhang

A.Isattr；chattr

B.ls；chmod

C.ls；chattr

D.lsattr；chmod

A.ls

B.touch

C.cat

D.vi/vim