1.top --查看进程

2.su --临时切换用户命令

[root@tomato2 ~]# sudo su gongxijun

[gongxijun@tomato2 root]$

3.whoami ---我是谁 查看自己目前的用身份

[gongxijun@tomato2 root]$ whoami

gongxijun

4.exit ---退出当前用户

[gongxijun@tomato2 root]$ exit

exit

[root@tomato2 ~]#

5.ifconfig ---查看用户的ip信息 mac,eth0 ,ip 等等信息

[gongxijun@tomato2 root]$ ifconfig

eth0 Link encap:Ethernet HWaddr D0:50:99:17:37:1F

inet addr:192.168.0.155 Bcast:192.168.0.255 Mask:255.255.255.0

inet6 addr: fe80::d250:99ff:fe17:371f/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:1529804 errors:0 dropped:0 overruns:0 frame:0

TX packets:1549053 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:369566501 (352.4 MiB) TX bytes:1376257841 (1.2 GiB)

lo Link encap:Local Loopback

inet addr:127.0.0.1 Mask:255.0.0.0

inet6 addr: ::1/128 Scope:Host

UP LOOPBACK RUNNING MTU:16436 Metric:1

RX packets:31 errors:0 dropped:0 overruns:0 frame:0

TX packets:31 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:2130 (2.0 KiB) TX bytes:2130 (2.0 KiB)

6.which --搜索命令(用于查找相关命令的位置)

[gongxijun@tomato2 root]$ which cat

/bin/cat

如果想要验证：

[gongxijun@tomato2 root]$ dir /bin/

alsaunmute dnsdomainname lsblk rview

arch domainname lscgroup sed

awk dumpkeys lssubsys setfont

basename echo mail setserial

bash ed mailx sh

cat egrep mkdir sleep

cgclassify env mknod sort

cgcreate ex mktemp stty

cgdelete false more su

cgexec fgrep mount sync

cgget find mountpoint tar

cgset findmnt mv taskset

cgsnapshot gawk nano tcsh

chgrp gettext netstat touch

chmod grep nice tracepath

chown gtar nisdomainname tracepath6

cp gunzip ping traceroute

cpio gzip ping6 traceroute6

csh hostname plymouth true

cut ipcalc ps umount

dash iptables-xml pwd uname

date iptables-xml-1.4.7 raw unicode_start

dbus-cleanup-sockets kbd_mode readlink unicode_stop

dbus-daemon keyctl red unlink

dbus-monitor kill redhat_lsb_init usleep

dbus-send link rm vi

dbus-uuidgen ln rmdir view

dd loadkeys rnano ypdomainname

df login rpm zcat

dmesg ls rvi

7.locate ---文件搜索命令

查找一个 iptables的文件 ，然后就可以搜索出这么多文件。

[gongxijun@tomato2 root]$ locate iptables

/bin/iptables-xml

/bin/iptables-xml-1.4.7

/etc/alternatives/bin-iptables-xml.x86_64

/etc/alternatives/iptables.x86_64

/etc/alternatives/man-iptables-restore.x86_64

/etc/alternatives/man-iptables-save.x86_64

/etc/alternatives/man-iptables-xml.x86_64

/etc/alternatives/man-iptables.x86_64

/etc/alternatives/sbin-iptables-multi.x86_64

/etc/alternatives/sbin-iptables-restore.x86_64

/etc/alternatives/sbin-iptables-save.x86_64

/etc/rc.d/init.d/iptables

在使用locate查找文件是，也可以使用星号表示所有字符，点号表示所有单字符。

举列子： 要查找所有以字母ca开头的文档

[gongxijun@tomato2 root]$ locate *a

/var/lib/yum/yumdb/z/b8019061884a679c3b9b867b44c7b9c64182240d-zip-3.0-1.el6-

x86_64/checksum_data

/var/log/sa

/var/log/samba

[gongxijun@tomato2

8. 手动更新数据库 --- updatedb

9. whereis ----特殊文件搜索命令

[gongxijun@tomato2 root]$ whereis cat

cat: /bin/cat /usr/share/man/man1/cat.1.gz /usr/share/man/man1p/cat.1p.gz

10. apropos --- 关键字搜索命令

[gongxijun@tomato2 root]$ apropos process