CentOS Basic Command Daquan

1. Commands for shutdown (System shutdown, restart, and logout)

SHUTDOWN-H now shut down system (1)

Init 0 Shutdown System (2)

Telinit 0 Shutdown System (3)

Shutdown-h Hours:minutes & Shutdown system at scheduled times

Shutdown-c Cancel the system at a predetermined time

Shutdown-r now restart (1)

Reboot restart (2)

Logout logoff

2. Commands to view system Information

The processor architecture of the Arch Display machine (1)

UNAME-M Display the processor architecture of the machine (2)

Uname-r displaying the kernel version in use

DMIDECODE-Q Display hardware system components-(SMBIOS/DMI)

Hdparm-i/DEV/HDA lists the architecture characteristics of a disk

HDPARM-TT/DEV/SDA performing a test read operation on the disk

Cat/proc/cpuinfo displaying information for CPU info

Cat/proc/interrupts Display Interrupt

Cat/proc/meminfo Verifying memory usage

Cat/proc/swaps shows which swap is used

Cat/proc/version version of the kernel is displayed

Cat/proc/net/dev Display network adapter and statistics

Cat/proc/mounts displaying the loaded file system

Lspci-tv List of PCI devices

LSUSB-TV Display USB Device

Date Displays the system date

Cal 2007 Displays the 2007 calendar table

Date 041217002007.00 sets the day and time of day-the year of the month. seconds

Clock-w saving time changes to the BIOS

3. File and Directory operation commands

Cd/home Enter '/home ' directory '

Cd.. Return to the top level directory

Cd.. /.. Return to the top level two directory

CD into the personal home directory

CD ~user1 into the personal home directory

CD-Return to the last directory

PWD Display work path

ls to view the files in the directory

Ls-f viewing files in a directory

Ls-l displaying details of files and directories

Ls-a Show hidden files

mkdir dir1 Create a directory called ' Dir1 '

mkdir dir1 DIR2 Create two directories at a time

Mkdir-p/tmp/dir1/dir2 Create a directory tree

Rm-f file1 Delete a file called ' File1 '

RmDir dir1 Delete a directory called ' Dir1 '

RM-RF Dir1 Delete a directory called ' Dir1 ' and delete its contents at the same time

RM-RF dir1 DIR2 Delete two directories and their contents at the same time

MV Dir1 New_dir Renaming/Moving a directory

CP file1 file2 Copy a file

CP dir/*. Copy all files under a directory to the current working directory

Cp-a/tmp/dir1. Copy a directory to the current working directory

Cp-a dir1 dir2 Copy a directory

Ln-s file1 lnk1 Create a soft link to a file or directory

ln file1 lnk1 Create a physical link to a file or directory

Touch File1 Create a file

4. File Search command

Find/-name file1 from '/' to the root file system to search for files and directories

Find/-user User1 search for files and directories belonging to user ' User1 '

Find/home/user1-name \*.bin in directory '/home/user1 ' search for files with '. Bin '

Find/usr/bin-type f-atime +100 Search execution files that have not been used in the last 100 days

Find/usr/bin-type f-mtime-10 search for files created or modified within 10 days

Locate \*.ps looking for files ending with '. ps '-run the ' updatedb ' command first

Whereis file Displays the location of a binary, source, or man

Which file displays the full path of a binary or executable file

5. View the contents of a file

Cat File1 Viewing the contents of a file starting from the first byte

TAC File1 To reverse view the contents of a file from the last line

More File1 View the contents of a long file

Less file1 is similar to the ' more ' command, but it allows a reverse operation in the same way as a forward operation in a file

Head-2 File1 View the first two lines of a file

Tail-2 File1 View the last two lines of a file 5. Mount command

MOUNT/DEV/HDA2/MNT/HDA2 mount a disk called hda2 (note: OK directory '/mnt/hda2 ' already exists)

Umount/dev/hda2 unloading a disk called HDA2 (first from Mount point '/mnt/hda2 ' exit)

Fuser-km/mnt/hda2 force unload when the device is busy

Umount-n/mnt/hda2 Run an unload operation without writing to the/etc/mtab file (useful when the file is read-only or when the disk is full)

Mount/dev/fd0/mnt/floppy mount a floppy disk

Mount/dev/cdrom/mnt/cdrom mount a disc

Mount/dev/hdc/mnt/cdrecorder mount a CDRW or dvdrom

Mount/dev/hdb/mnt/cdrecorder mount a CDRW or dvdrom

Mount-o Loop File.iso/mnt/cdrom mount a file or ISO image file

Mount-t Vfat/dev/hda5/mnt/hda5 to mount a Windows FAT32 file system

Mount/dev/sda1/mnt/usbdisk mount a USB drive or flash device

Mount-t Smbfs-o Username=user,password=pass//winclient/share/mnt/share to mount a Windows network share

6. Commands for disk space operations

DF-H displays a list of the partitions that are already mounted

LS-LSR |more arranging files and directories in size

Du-sh dir1 estimate directory ' Dir1 ' already used disk space '

Du-sk * | SORT-RN display the size of files and directories in terms of capacity size

7. User and group related commands

Groupadd group_name Create a new user group

Groupdel group_name Delete a user group

Groupmod-n new_group_name old_group_name Renaming a user group

Useradd-c "Name Surname"-G admin-d/home/user1-s/bin/bash user1 create a user who belongs to the "admin" user group

Useradd User1 create a new user

Userdel-r User1 Delete a user ('-R ' at the same time delete the home directory)

passwd User1 Modify a user's password (root only allowed)

Chage-e 2005-12-31 user1 setting the expiration period for user passwords

LS-LH Display Permissions

chmod 777 Directory1 Set directory owner (U), Group (g), and others (O) to read (R), write (w), and execute (x) permissions

chmod directory1 Delete Group (g) Read and write execution permissions to the directory with others (O)

Chown user1 File1 Change the Owner property of a file for use1.

Chown-r User1 Directory1 Change the owner property of a directory and change the properties of all files in the directory to use1 all

CHGRP group1 file1 Changes the file to a group of group1

Chown user1:group1 File1 Change the owner and group properties of a file, the owning group is group1 and the user is use1.

Find/-perm-u+s lists all files in a system that use SUID control

chmod U+s/bin/file1 sets the SUID bit of a binary file-the user who runs the file is also given the same permissions as the owner

chmod u-s/bin/file1 Disables the suid bit for a binary file

chmod G+s/home/public sets the Sgid bit of a directory-similar to suid, but this is a directory-specific

chmod g-s/home/public Disable SGID bit of a directory

chmod O+t/home/public Set the STIKY bit of a file-allow only legitimate owners to delete files

chmod o-t/home/public Disable STIKY bit of a directory

8. The command to package and decompress files

BUNZIP2 file1.bz2 Extract a file called ' file1.bz2 '

bzip2 file1 compress a file called ' File1 '

Gunzip file1.gz Extract a file called ' file1.gz '

gzip File1 compress a file called ' File1 '

gzip-9 file1 Maximum Compression

RAR a File1.rar test_file create a package called ' File1.rar '

RAR a file1.rar file1 file2 dir1 packaging ' file1 ', ' file2 ' and directory ' Dir1 '

rar x file1.rar rar Package

Unrar x File1.rar extract rar Package

TAR-CVF Archive.tar File1 Create a non-compressed tar package

TAR-CVF Archive.tar file1 file2 dir1 Create a package containing ' file1 ', ' file2 ' Dir1 '

TAR-TF Archive.tar Display the contents of a package

TAR-XVF Archive.tar Release a package

TAR-XVF ARCHIVE.TAR-C/TMP releases the compressed package to the/tmp directory (-c is the specified directory)

TAR-CVFJ archive.tar.bz2 Dir1 Create a compressed package in BZIP2 format

TAR-XVFJ archive.tar.bz2 extract a compressed package in BZIP2 format

TAR-CVFZ archive.tar.gz Dir1 Create a zipped package in gzip format

TAR-XVFZ archive.tar.gz Unzip a compressed package in gzip format

Zip file1.zip file1 Create a zip-format compression Package

Zip-r file1.zip file1 file2 Dir1 compresses several files and directories into a zip-format package at the same time

Unzip File1.zip unzip a zip-format tarball

9. Commands for RPM packages

RPM-IVH package.rpm Installing an RPM package

RPM-IVH--nodeeps package.rpm Install an RPM package and ignore dependency warnings

Rpm-u package.rpm Update a RPM package without changing its configuration file

Rpm-f package.rpm update one to determine which RPM package is installed

Rpm-e package_name.rpm Delete an RPM package

RPM-QA display all installed RPM packages in the system

Rpm-qa | grep httpd shows all RPM packages with the words "httpd" in their names

Rpm-qi Package_name get special information for an installed package

RPM-QL Package_name displays a list of files provided by an already installed RPM package

RPM-QC Package_name Displays a list of configuration files provided by an already installed RPM package

Rpm-q package_name--whatrequires shows a list of dependencies that exist with a RPM package

Rpm-q package_name--whatprovides shows the volume of a RPM package

Rpm-q package_name--scripts Show scripts executed during installation/removal L

Rpm-q package_name--changelog shows the revision history of a RPM package

rpm-qf/etc/httpd/conf/httpd.conf confirm which RPM package is provided for the given file

RPM-QP package.rpm-l displays a list of files provided by a RPM package that has not been installed

RPM--import/media/cdrom/rpm-gpg-key Import Public key digital certificate

RPM--checksig package.rpm confirming the integrity of a RPM package

RPM-QA Gpg-pubkey confirm the integrity of all RPM packages that have been installed

Rpm-v package_name Check file size, license, type, owner, group, MD5 check, and last modified time

Rpm-va Check all installed RPM packages in the system-use with care

RPM-VP package.rpm confirm that an RPM package is not installed

Rpm2cpio package.rpm | Cpio--extract--make-directories *bin* Run executable from an RPM package

rpm-ivh/usr/src/redhat/rpms/' arch '/package.rpm install a built-in package from a RPM source

Rpmbuild--rebuild package_name.src.rpm Build a RPM package from one RPM source

10.YUM Package Upgrade

Yum install package_name download and install a RPM package

Yum Localinstall package_name.rpm will install a RPM package and use your own software repository to resolve all dependencies for you

Yum Update package_name.rpm updates all installed RPM packages in the current system

Yum Update package_name updates a RPM package

Yum Remove package_name Delete an RPM package

Yum list lists all packages installed in the current system

Yum search package_name searching for packages in RPM repositories

Yum Clean Packages cleanup rpm cache to delete downloaded packages

Yum Clean headers Delete all header files

Yum Clean all deletes all cached packages and header files

CentOS Basic Command Daquan