linux如何查看当前系统都有哪些进程？

ps -aux 或者ps -elf

[root@centos6 ~ 13:20 #56]# ps -aux
Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.8/FAQ
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.0  0.0   2900  1428 ?        Ss   10:43   0:01 /sbin/init
root         2  0.0  0.0      0     0 ?        S    10:43   0:00 [kthreadd]
root         3  0.0  0.0      0     0 ?        S    10:43   0:00 [migration/0]
root         4  0.0  0.0      0     0 ?        S    10:43   0:00 [ksoftirqd/0]
……
[root@centos6 ~ 13:21 #57]# ps -elf
F S UID        PID  PPID  C PRI  NI ADDR SZ WCHAN  STIME TTY          TIME CMD
4 S root         1     0  0  80   0 -   725 -      10:43 ?        00:00:01 /sbin/init
1 S root         2     0  0  80   0 -     0 -      10:43 ?        00:00:00 [kthreadd]
1 S root         3     2  0 -40   - -     0 -      10:43 ?        00:00:00 [migration/0]
1 S root         4     2  0  80   0 -     0 -      10:43 ?        00:00:00 [ksoftirqd/0]
1 S root         5     2  0 -40   - -     0 -      10:43 ?        00:00:00 [migration/0]