运行级别对于系统使用来说应该是一个很重要的基本概念，原来一直使用Linux，现在又用Solaris和AIX，一下模糊了，他们对runlevel的定义有些许不同，现本人搜集了哈，做个比较。
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runlevel
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Linux
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Solaris
|
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0
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halt (Do NOT set initdefault to /etc/inittal "initlevel" entry)
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halt
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1
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Single user mode
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Single user mode
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2
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Multiuser, without NFS (The same as 3, if you do not have networking)
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multiuser, unshare net
|
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3
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Full multiuser mode
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multiuser, deafult
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|
4
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unused
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unused
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5
|
X11
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halt, power off
|
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6
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reboot (Do NOT set initdefault to this)
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reboot to level 3
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|
S
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None
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equal “init 1”, “boot -s”
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AIX:
"AIX does not follow the System V R4 (SVR4) run level specification, with run levels from 0 to 9 available, as well as from a to c. 0 and 1 are reserved, 2 is the default normal multiuser mode and run levels from 3 to 9 are free to be defined by the administrator. Run levels from a to c allow the execution of processes in that run level without killing processes started in another."
本来想把上个表格做得更全些的，结果在google上一搜，晕！人家
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