[ec2-user@ip-172-31-19-78 c_test]$ ls
!           sample.txt  test10  test12  test14  test16  test18  test2   test21  test3  test5  test7  test9
do_test.sh  test1       test11  test13  test15  test17  test19  test20  test22  test4  test6  test8  test_dir
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 1
Test1(open-O_APPEND): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 2
Test2(open-O_ASYNC): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 3
Test3(open-O_CLOEXEC): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 4
Test4(open-O_CREAT): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 5
Test5(open-O_DIRECT): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 6
Test6(open-O_DIRECTORY): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 7
Test7(open-O_DSYNC): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 8
Test8(open-O_EXCL): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 9
Test9(open-O_LARGEFILE): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 10
Test10(open-O_NOATIME): OK
[ec2-user@ip-172-31-19-78 c_test]$ ls /nfs_dir/
sample.txt
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 11
Test11(open-O_NOCTTY): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 12
Test12(open-O_NOFOLLOW): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 13
Test13(open-O_NONBLOCK): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 14
Test14(open-O_PATH): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 15
Test15(open-O_SYNC): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 16
Test16(open-O_TMPFILE): NG
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 17
Test17(open-O_TRUNC): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 18
Test18(read): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 19
Test19(write): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 20
Test20(lseek): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 21
Test21(remove): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 22
Test22(rename): NG
[ec2-user@ip-172-31-19-78 c_test]$ ls /nfs_dir/
sample.txt
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 1
Test1(open-O_APPEND): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 2
Test2(open-O_ASYNC): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 3
Test3(open-O_CLOEXEC): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 4
Test4(open-O_CREAT): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 5
Test5(open-O_DIRECT): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 6
Test6(open-O_DIRECTORY): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 7
Test7(open-O_DSYNC): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 8
Test8(open-O_EXCL): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 9
Test9(open-O_LARGEFILE): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 10
Test10(open-O_NOATIME): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 11
Test11(open-O_NOCTTY): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 12
Test12(open-O_NOFOLLOW): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 13
Test13(open-O_NONBLOCK): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 14
Test14(open-O_PATH): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 15
Test15(open-O_SYNC): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 16
Test16(open-O_TMPFILE): NG
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 17
Test17(open-O_TRUNC): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 18
Test18(read): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 19
Test19(write): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 20
Test20(lseek): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 21
Test21(remove): OK
[ec2-user@ip-172-31-19-78 c_test]$ sh do_test.sh 22
Test22(rename): NG
[ec2-user@ip-172-31-19-78 c_test]$ umount /nfs_dir/
umount: /nfs_dir: umount failed: Operation not permitted.
[ec2-user@ip-172-31-19-78 c_test]$