linux - 如何正确循环这个 BASH 语句？

Question

在我编写的这行代码中，最好的循环是什么，它遍历日志文件并找到 $6 中失败的行？对 BASH 和 LINUX 很陌生，无法使任何循环正常工作。

Sep 13 12:09:39 icarus sshd[14043]: Failed none for invalid user 55659
Sep 13 12:09:43 icarus sshd[14043]: pam_unix(sshd:auth): check pass; user unknown
Sep 13 12:09:43 icarus sshd[14043]: pam_unix(sshd:auth):
Sep 13 12:09:44 icarus sshd[14043]: Failed password for invalid user 55659
Sep 13 12:09:48 icarus sshd[14043]: pam_unix(sshd:auth): check pass; user unknown
Sep 13 12:09:50 icarus sshd[14043]: Failed password for invalid user 55659 from

示例命令

cat auth.log | sed -e 's/,//g' | awk -F" " '{print $6}'

Answer 1

$ grep Failed auth.log
Sep 13 12:09:39 icarus sshd[14043]: Failed none for invalid user 55659
Sep 13 12:09:44 icarus sshd[14043]: Failed password for invalid user 55659
Sep 13 12:09:50 icarus sshd[14043]: Failed password for invalid user 55659 from