linux命令学习(66 67)-chsh dmesg

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chinalscxc 2013-02-28 23:59:52 博主文章分类：linux ©著作权

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【命令名称】chsh

【使用权限】所有人

【命令语法】chsh [-ls]

【功能说明】更换shell

【常用参数】l 列出当前系统上shell

s 设置shell

【命令实例】

1,更换shell

[cxc@cxcserver ~]$ sudo chsh -l

[sudo] password for cxc:

/bin/sh

/bin/bash

/sbin/nologin

[cxc@cxcserver ~]$ chsh -s /bin/sh

Changing shell for cxc.

Password:

Shell changed.

[cxc@cxcserver ~]$ grep cxc /etc/passwd

cxc:x:500:500::/home/cxc:/bin/sh

[cxc@cxcserver ~]$ chsh -s /bin/bash

Changing shell for cxc.

Password:

Shell changed.

[cxc@cxcserver ~]$ grep cxc /etc/passwd

cxc:x:500:500::/home/cxc:/bin/bash

[cxc@cxcserver ~]$

【命令名称】dmesg

【使用权限】root

【命令语法】demsg [c]

【功能说明】分析内核产生的信息

【常用参数】c 在打印出来后清除内核信息

【命令实例】

1.显示内核信息

[cxc@cxcserver ~]$ dmesg

Initializing cgroup subsys cpuset

Initializing cgroup subsys cpu

Linux version 2.6.32-279.el6.x86_64 (mockbuild@c6b9.bsys.dev.centos.org) (gcc version 4.4.6 20120305 (Red Hat 4.4.6-4) (GCC) ) #1 SMP Fri Jun 22 12:19:21 UTC 2012

Command line: ro root=UUID=98d3c7a3-7c1c-472e-8883-2d3b63f6400f rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet

KERNEL supported cpus:

Intel GenuineIntel

AMD AuthenticAMD

Centaur CentaurHauls

BIOS-provided physical RAM map:

BIOS-e820: 0000000000000000 - 000000000009f800 (usable)

BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)

BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)

BIOS-e820: 0000000000100000 - 000000007f5e0000 (usable)

BIOS-e820: 000000007f5e0000 - 000000007f5e3000 (ACPI NVS)

BIOS-e820: 000000007f5e3000 - 000000007f5f0000 (ACPI data)

BIOS-e820: 000000007f5f0000 - 000000007f600000 (reserved)