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root@oracledb ~]# ps -aux | grep 100
Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.7/FAQ
root 2969 0.0 0.0 61092 708 pts/0 S+ 12:15 0:00 grep 100
根据/usr/share/doc/procps-3.2.7/FAQ文件所述
[root@oracledb ~]# more /usr/share/doc/procps-3.2.7/FAQ
Why does "ps -aux" complain about a bogus '-'?
According to the POSIX and UNIX standards, the above command asks to display
all processes with a TTY (generally the commands users are running) plus all
processes owned by a user named "x". If that user doesn't exist, then ps will
assume you really meant "ps aux". The warning is given to gently break you of a
habit that will cause you trouble if a user named "x" were created.
正确格式为：
[root@oracledb ~]# ps aux | grep 100
root 2579 0.0 0.0 61088 704 pts/0 S+ 12:08 0:00 grep 100
