/etc/inittab

 经常修改/etc/initab文件,其实也就是修改启动的runlevel而已.其实
    1:2345:respawn:/sbin/mingetty tty1
    2:2345:respawn:/sbin/mingetty tty2
    3:2345:respawn:/sbin/mingetty tty3
    4:2345:respawn:/sbin/mingetty tty4
    5:2345:respawn:/sbin/mingetty tty5
    6:2345:respawn:/sbin/mingetty tty6
 我们不需要这么多的terminal,可以注释掉一些我把tty4到6给注释了,可以提高点性能^_^.

 /sbin/telinit is linked to /sbin/init.  It takes a one-character argument and signals init  to
       perform the appropriate action.  The following arguments serve as directives to telinit:

       0,1,2,3,4,5 or 6
              tell init to switch to the specified run level.

       a,b,c  tell init to process only those /etc/inittab file entries having runlevel a,b or c.

       Q or q tell init to re-examine the /etc/inittab file.

       S or s tell init to switch to single user mode.

       U or u tell  init to re-execute itself (preserving the state). No re-examining of /etc/inittab
              file happens. Run level should be one of Ss12345, otherwise request would  be  silently
              ignored.

觉得init q有点小意思,就记载这里了,也算点小小的心得体会把