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add `ps -l' support for openwrt


1 description

As default, when we run `ps', we can only see the following sections: 

root@a:~# ps
PID USER       VSZ STAT COMMAND
    1 root      1416 S    /sbin/procd
    2 root         0 SW   [kthreadd]
    3 root         0 SW   [ksoftirqd/0]

It's far from enough.

2 add ps -l

2.1 set by `make menuconfig'

do 

make menuconfig

then select `Enable long output option' 

Base system  --->
  busybox  --->
    Process Utilities  --->
      [*] ps
      [*]   Enable long output option (-l)

when -l enabled, save the configuration. we can find `CONFIG_BUSYBOX_CONFIG_FEATURE_PS_LONG=y' in .config.

2.2 quick test

For quick test, compile busybox is enough:

  • compile busybox 
$ make package/busybox/compile V=s
  • copy to board

    Use ssh or tftp to replace the /bin/busybox in our board by using the new compiled one.

    The compiled `busybox' loacated in: 

build_dir/target-mips_34kc_uClibc-0.9.33.2/busybox-1.23.2/
  • Grant the execute privilege. 
root@a:~# chmod +x /bin/busybox
  • Then test it on board: 
root@a:~# ps
S   UID   PID  PPID   VSZ   RSS TTY   STIME TIME     CMD
S     0     1     0  1416   644 0:0   May26 00:00:07 /sbin/procd
S     0     2     0     0     0 0:0   May26 00:00:00 [kthreadd]
S     0     3     2     0     0 0:0   May26 00:11:13 [ksoftirqd/0]