linux小命令

本文主要记录了我在工作中用到的一些linux命令

 

1、查询linux系统是32位还是64位

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-->zhaolei@zhaolei :~# file /usr/bin/whoami
/usr/bin/whoami: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, stripped

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2、自动登入SSH

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-->zhaolei@zhaolei:~$ ssh-keygen -t rsa
zhaolei@zhaolei:~$ ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.1.100
zhaolei@zhaolei:~$ ssh root@192.168.1.100

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3、修改用户登入名

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-->zhaolei@zhaolei:~$ sudo usermod -l flyingzl zhaolei

下次登入后，zhaolei就无法登入了，改用flyingzl登入，登入后的命令行效果如下：

代码

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-->flyingzl@zhaolei:~$ finger flyingzl
Login: flyingzl                   Name: zhaolei-linux
Directory: /home/zhaolei-linux          Shell: /bin/bash
On since Mon Nov 15 16:21 (CST) on tty7 from :0
    3 days 16 hours idle
On since Mon Nov 15 16:21 (CST) on pts/0 from :0.0
No mail.
No Plan.
flyingzl@zhaolei:~$ 

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4、MySQL编码修改

修改/etc/mysql/my.cnf文件，在[mysql]和[mysqld]下增加default-character-set utf8

 

5、任务计划

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-->root@one-desktop:~# crontab -e
root@one-desktop:~# crontab -l

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crontab -e 命令表示编辑任务计划，crontab -l 表示显示已有的任务计划，看截图：

解释一下，m表示minute，可选值为0～59；h表示hour，可选值为0～23；dom即Day Of Month,可选值为1～31；month表示月份，可选值为1～12；down即Day Of Week，表示星期几，可选值为0～6，0表示周日；command表示要执行的命令。

根据上面的解释，0 9 * * 1-5 就表示每周一～周五的9点执行命令。

 

6、提示 NO_PUBKEY 6AF0E1940624A220

输入命令 sudo gpg --keyserver keyserver.ubuntu.com --recv 0624A220 ，然后再sudo apt-get update即可

 

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-->oot@ubuntu:~# gpg --keyserver keyserver.ubuntu.com --recv 0624A220 
gpg: requesting key 0624A220 from hkp server keyserver.ubuntu.com
gpg: key 0624A220: "Launchpad PPA for TualatriX" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1

root@ubuntu:~# apt-key list  
/etc/apt/trusted.gpg
--------------------
pub   1024D/437D05B5 2004-09-12
uid                  Ubuntu Archive Automatic Signing Key <[e-mail]>
sub   2048g/79164387 2004-09-12

pub   1024D/FBB75451 2004-12-30
uid                  Ubuntu CD Image Automatic Signing Key <[e-mail]>

pub   1024R/0624A220 2009-01-19
uid                  Launchpad PPA for TualatriX

root@ubuntu:~# 

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7、访问windows共享文件夹

 

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-->flyingzl@zhaolei:~$ smbclient //10.4.68.14/www -U zhaolei%password
Domain=[PLATFORM] OS=[Windows 7 Ultimate 7600] Server=[Windows 7 Ultimate 6.1]
smb: \> dir
  .                                   D        0  Tue Mar  9 09:49:04 2010
  ..                                  D        0  Tue Mar  9 09:49:04 2010
  phpinfo.php                         A       65  Wed May 27 08:48:56 2009
  phpMyAdmin                          D        0  Tue Mar  9 09:49:04 2010
  ext-3.1.1                           D        0  Tue Feb  9 07:22:00 2010
  two.html                            A      712  Thu May 20 16:04:26 2010
  dojo-release-1.5.0rc1               D        0  Fri Jun 11 14:26:14 2010
  飞秋.exe                          A  3305472  Sat Feb 20 11:57:52 2010
  django-docs                         D        0  Thu Jun 17 17:14:30 2010
  statusnet-0.9.3                     D        0  Wed Jun 30 03:09:48 2010
  demo.php                            A       32  Thu Oct 28 14:41:38 2010
  hyk-proxy-install_0.9.0.exe         A  2146018  Wed Oct 20 20:36:28 2010
  charts                              D        0  Wed Oct 27 09:15:54 2010
  demo1.php                           A      111  Thu Oct 28 14:44:04 2010
  HQ.SQL                              A     1947  Tue Nov  2 14:37:48 2010
  ajaxplorer-core-3.1.0               D        0  Mon Nov 15 18:46:14 2010
  FusionWidgets_Developer             D        0  Mon Jul 19 10:30:32 2010
  java-linux.bin                      A 83790617  Wed Nov 24 18:23:08 2010

        49558 blocks of size 524288. 19119 blocks available
smb: \> 

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也可以直接用命令 smbclient -c "dir" //10.4.68.14/www -U zhaolei%password

8、同步服务器时间

 

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-->suo cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

#设置utc为no
sudo vim /etc/default/rcS

sudo ntpdate cn.pool.ntp.org

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9、通过apt-get安装sun-jdk

    在/etc/apt/sources.list中增加"deb http://archive.canonical.com/ lucid partner",然后apt-get update、apt-get install sun-java6-jdk即可

 

10、删除某个系统服务

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-->#删除mysql服务
#/etc/init.d/mysql start将不可用
sudo update-rc.d -f mysql remove

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11、查看可用内存、硬盘大小

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-->#显示可用内存大小
root@flyingzl:~# free -m

#显示可用磁盘大小
root@flyingzl:~# df -h

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来源：http://www.cnblogs.com/flyingzl/articles/1877747.html