Shulou(Shulou.com)06/01 Report--

This article mainly introduces the compression and packaging commands of files and file systems in linux. It has certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. Let Xiaobian take you to understand it together.

====gzip compression command ===

# gzip [-cdtv#] filename-> files that can be unzipped by compress, zip, gzip software

-c: Output compressed data to screen, which can be handled by data redirection

-d: decompression parameter

-t: Verify the consistency of a compressed file to see if the file has errors

-v: Display information such as compression ratio of source file/compressed file

-#: Compression rating,-1 fastest but worst compression ratio,-9 slowest but best compression ratio. Default-6

====bzip2 Compression Command ====

# bzip2 [-cdkzv#] filename

-c: Output the data generated during compression to the screen

-d: decompression command

-k: Keep the original file, do not delete the source file

-z: compression parameter

-v: Display information such as compression ratio of source file/compressed file

==== Compress/decompress and pack command tar===

# tar -jcvf file.tar.bz2 file1 file2 file3…-> Compression and packaging with bzip2

# tar -jxvf file.tar.bz2 -C directory-> Extract to specified folder with bzip2

# tar -jtvf file.tar.bz2-> View compressed file contents of bz2

---------------------------

# tar -zcvf file.tar.gz file1 file2 file3…-> Compression and packaging with gzip

# tar -zxvf file.tar.gz -C directory-> Use gzip to extract to specified folder

# tar -ztvf file.tar.gz-> View compressed file contents of gz

--------------------------–

-p: Keep original permissions and attributes of backup data backup (-c) important configuration files

-P: Keep absolute path, i.e. allow backup data to contain root directory existence (rarely used)

- exclude=FILE: Do not package FILE during compression

If you only want to unpack a single file, you can use the command:

# tar -jtvf file.tar.bz2| grep ‘myfile’

# tar -jxvf file.tar.bz2 File name to be solved

====dump backup complete file system ====

# dump -S /dev/sda1-> Just list how much disk space is needed to backup

# dump -0u -f /root/boot.dump /boot-> Backup level 0 means full backup, -u means and record dump time to/etc/dumpdatas file

If it is a directory rather than a single file system, it can only be backed up completely and cannot use the-u parameter, and the data that needs to be backed up is in this directory:

# dump -0j -f /root/etc.dump.bz2 /etc

===restore restore dump backup ===

# restore [-tir] -f dumpfile

# restore -C -f dumpfile -D mount point-> compare dump with actual file

-t: View dump file contents

-i: Enter interactive mode

-r: Restore of the entire file system

==== CD Writer ====

* First, build the data you need to backup into an image file (ISO), using the mkisofs command.

* Burn the image file to a CD or DVD using the cdrecord command

# mkisofs -o image file-rv -m file to backup file… -v vol -graft-point isodir=systemdir

For example: # mkisofs -r -v 'linux_file'-o /tmp/system.img -m /home/lost+found -graft-point /root=/root /home=/home /etc=/etc

Next, let's talk about the CD burning tool cdrecord

# cdrecord -scanbus dev=ATA

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.