Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.7/FAQ

以前一直在AIX系统下玩,今天无意在linux下运行一个命令,出现如下错误:

[root@erpdemo ~]# ps -aux

Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.7/FAQ

USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND

……

奇怪?这个命令在AIX下运行一点也没有问题,提示语法错误? 看来命令书写有错误,ksh和bash的区别吗?然后换一种方式

[root@erpdemo ~]# ps aux

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.0  0.0  10344   684 ?        Ss    2010   1:33 init [3]                            
root         2  0.0  0.0      0     0 ?        S<    2010   0:01 [migration/0]

我们继续去分析问题,man ps

EXAMPLES
To see every process on the system using standard syntax:
   ps -e
   ps -ef
   ps -eF
   ps -ely

To see every process on the system using BSD syntax:
   ps ax
   ps axu

a               Lift the BSD-style "only yourself" restriction, which is imposed upon the set of all processes when some BSD-style (without "-")
                options are used or when the ps personality setting is BSD-like. The set of processes selected in this manner is in addition to
                the set of processes selected by other means. An alternate description is that this option causes ps to list all processes with a
                terminal (tty), or to list all processes when used together with the x option.

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