Cac Lenh Ca ban trong CentOS 6

Posted by admin On April 21, 2014 5 Comments

l.useradd - Lenh tao User hoac chinh siia thong tin User.

Cu phap useradd <user name>

Cac lenh tuy chon voi useradd

-s the login shell for the new user account

# useradd -s /sbin/nologin user

-d home directory for the new user account

# useradd -d /home/user user

-g force use GROUP for the new user account

# useradd -g group user

phan 1-e set account expiration date to EXPIRE_DAT

-uforce use the UID for the new user account # useradd

-u 550 user

-mcreate home directory for the new user account #

useradd -m user

-Mdo not create user's home directory(overrides

/etc/login.defs) # useradd -M user

2. passwd - dung d§ tao password chfrng th^c cho user

Cu phap passwd<usernam>

Cac len tuy chon voi passwd

This is a quick way to disable a password for

an account # passwd -d user

This option is used to lock the specified account and it is

available to root only # passwd -l user

This is the reverse of the -l option - it will unlock the account password by removing the ! prefix

# passwd -u user

This will set the maximum password lifetime, in days, if the user's account supports password life-times

# passwd -x 10 user

This will set the minimum password lifetime, in days, if the user's account supports password life-times. Available to root only

# passwd -n 10 user

This will set the number of days which will pass before an expired password for this account will be taken to mean that the account is inactive and should be disabled, if the user's account supports pass-word lifetimes

# passwd -i 10 user

-w This will set the number of days in advance the user will begin receiving

warnings that her password will expire, if the user's account supports password lifetimes

# passwd -w 10 user

-S This will output a short information about the status of the password for a

given account

# passwd -S user

user PS 2009-09-12 0 99999 7 -1 (Password set, MD5 crypt.)

3. exit- dung de kit thuc phien lam viec

4. su-dung de chuyen toi user cu

phap us - <user name>

5. usermod- dung de tuy chinh user account. cu

phap usermod -<tuy chon><user name>

-d new home directory for the user account

-g force use GROUP as new primary group

-G new list of supplementary GROUPS

-s new login shell for the user account

-u new UID for the user account

-L lock the user account

-U unlock the user account

6. vi- lenh cho phep chinh siia cu

phap vi <file> tuy chon voi lenh vi.

chuyen doi Command mode/Input Mode

Luu va thoat.

Biiu khien con tro

Bilu khien thanh cuon

Bilu khien chinh sua

V , , ,

Dieu khien tlm kiem.

7. Newaliases- lenh dung de clu hlnh thay doi

8. chkconfig- truy vln va cap nhat

thong tin services. cu phap chkconfig

<services>

Cac Lenh Ca ban trong CentOS 6 - phan 2

Posted by admin On April 22, 2014 10 Comments

1. yum-tuy chon update

cu phap yum <option command package>

command

install Install a package or packages on your system

# yum install package

update Update a package or packages on your system

# yum update package

remove Remove the packages

# yum remove package

groupinstall Install the packages in a group on your system

yum groupinstall "X Window System" groupupdate Update the packages in a group on your systemyum groupupdate "X Window System"

Remove the packages in a group from your

system

# yum groupremove "X Window

System"

List a package or groups of packages

# yum lis t

=> display packages that is possible to install

# yum list installed

=> display installed packages

Check for available package updates

# yum check-update

Display details about a package or group of packages

# yum info package

Search package details for the given string

# yum s earch keyword

List a package's dependencies

groupremove

list

check-update

info

search

deplist

yum deplist package

option

answer yes for all questions # yum -y

install package

enable one or more repositories (wildcards allowed)

# yum -enablerepo=repo install

package

disable one or more repositories (wildcards

allowed)

# yum -disablerepo=repo

install package exclude

package(s) by name or glob

-y

-enablerepo=repo

-disablerepo=repo

-exclude=package

-noplugins

yum -exclude=package update disable Yum plugin

s# yum -noplugins update

2. wget - The non-interactive network

downloader [SYNOPSIS] wget URL

option

-c resume getting a partially-

downloaded file

3. rpm - quan ly Package RPM

[Cu phap ] rpm <OPTION PACKAGE>

option

This installs a new package

# rpm -i package

This will upgrade packages, but only if an earlier version currently exists

# rpm -F package

-V

This upgrades or installs the package currently installed to a newer version

# rpm -U package erase

(uninstall) package

# rpm -e package query

packages

# rpm -q package verify

installed packages

-F -U -e

-q

rpm -V package

-V

verify package signature

# rpm -K package

rebuild the database indices from the installed package headers

# rpm -rebuilddb

create a new database if one doesn't already exist

# rpm

-initdb

import

PUBKEY

# rpm -import /usr/share/rhn/RPM-GPG-KEY

show package name

-rebuilddb

-initdb

-import

options with i, U

rpm -iv package

display progress

# rpm -ivh package

Print lots of ugly debugging information

# rpm -ivv package

Don't do a dependency check before installing or upgrading a package

# rpm -ivh -nodeps package

Don't really uninstall anything, just go through the motions

# rpm -ivh -test package

Query all installed packages

# rpm -qa

Display package information, including name, version, and description. This uses the -queryformat if one was specified

-nodeps

-test

options with q

rpm -qi package List files in packag

erpm -ql package

-c List only configuration files (implies -l)

# rpm -qc package

-d List only documentation files (implies -l)

# rpm -qd package

-f Query package owning FILE

# rpm -qf /bin/bash

-R List packages on which this package depends

# rpm -qR package

-s Display the states of files in the package (implies -l)

# rpm -qs package

-last Orders the package listing by install time such that the latest

packages are at the top

# rpm -q -last package

-changelog Display change information for the package

# rpm -q -changelog package

4. source

Doc va thyc hien lenh tiU ten file trong ciia so lenh hien tai ,tra vi trang thai sau khi da

thyc hien lenh

5. visudo- chinh siia sudoers file

[cu phap] visudo

OPTION

option

-c Enable check-only mode

-f FILE Specify and alternate sudoers file location

-q Enable quiet mode

-s Enable strict checking of the sudoers file

6.shutdown -tit he thing

[cu phap] shutdown OPTION TIME MESSAGE

7.sudo - sudoedit - execute a command as

another user [SYNOPSIS] sudo OPTION

COMMAND

option

-u USER causes sudo to run the specified command as a user other than

root

-s runs the shell specified by the SHELL environment variable if it is

set or the shell as specified in passwd(5)

-H sets the HOME environment variable to the homedir of the target

user (root by default) as specified in passwd(5)

-l The -l (list) option will list out the allowed (and forbidden)

commands for the invoking user on the current host

-h show help

-v sudo will update the user's timestamp, prompting for the user's

password if necessary

-k The option to sudo invalidates the user's timestamp by setting

the time on it to the Epoch

-K The option is like -k except that it removes the user's timestamp

entirely

-b The option tells sudo to run the given command in the

background

8.userdel - xoa user account hoac file lien quan

[cu phap] userdel OPTION USER

option

-r

remove home directory and mail spoo

lCac Lenh Co ban trong CentOS 6 - phan 3

Posted by admin On April 23, 2014 4 Comments

l.echo - hien thi dong cua text

[Cu phap] echo OPTION STRING

option

-n do not output the trailing newline

-e enable interpretation of backslash escapes

2. dig - DNS lookup utility

[cu phap] dig OPTION (HOST NAME/IP ADDR)

option

typical invocation

# dig yahoo.com

-x reverse invocation

# dig -x 111.222.333.444

3.ls - Liet ke danh sach noi dung cua directory

[Cu phap] ls OPTION FILE/DIRECTORY

option

-X sort alphabetically by entry extension with -l,

4.rndc - Bilu khien server [cu phap] rndc

COMMAND

command

5.Ismod-chuong trinh cho chep hien thi trang thai cua modules trong Linux

Kernel [cu phap] lsmod

6.grep-xult ra phien phan cua kvm

[Cu phap] grep OPTION

PATTERN FILE opition

-i Ignore case distinctions in both the PATTERN and the input files

-n Prefix each line of output with the 1-based line number within its

input file

-v Invert the sense of matching, to select non-matching

lines

-w Select only those lines containing matches that form

whole words

-r(R) dir Read all files under each directory, recursively; this is

equivalent

to the -d recurse

option # grep -r 'word'

dir

7. cd-thay doi directory [cu phap] cd DIRECTORY

8.cp-copy file va directories.

[cu phap] cp OPTION(SOURCE FILE/DIRECTORY)[DEST FILE/DIRECTORY]

OPTION

# cp -R dir /etc

8. mkdir-tao directories

[cu phap] mkdir OPTION DIRECTORY

otion

-p no error if existing, make parent directories as needed

# mkdir /home/dir1/dir2

-m set permission mode (as in chmod), not rwxrwxrwx -

umask

# mkdir -m 700 dir

9. modprobe-la chuong trlnh dung de add hay remove mot modul tij Linux Kernel

[cu phap]modprobe OPTION

MODULE option