Linux Common Operations Command (ii)

Source: Internet
Author: User
Tags rsync

View a few lines of Linux logs

Display commands in reverse order tail view

Command format: Tail [-R] [-N number] [File]

"One" starts at line No. 3000 and displays 1000 rows. The 3000~3999 line is displayed

Cat FileName | Tail-n +3000 | Head-n 1000

Show file//display top 1000 lines starting from 3000 lines

"Two" displays 1000 rows to 3000 rows

Cat filename| Head-n 3000 | Tail-n +1000

* Note the order of the two methods

Decomposition:

Tail-n 1000: Show last 1000 rows

Tail-n + 1000: Starting from 1000 lines, showing 1000 rows later

Head-n 1000: Show front 1000 lines

Used in a log-slicing scenario. such as 1 logs a day, if used Tail-f, after 0 points in the console will not see the print log. (because the original log file will be stale finle.20151022 format)

If you use Tail-f, you can still see the printed log in the console after 0.

"Three" with sed command

Sed-n ' 5,10p ' filename so you can only view lines 5th through 10th of the file.

Linux installation software# sudo apt-get install rsync Note: In Debian, Ubuntu and other online installation methods;
# yum Install rsync Note: Fedora, Redhat and other online installation methods;
# RPM-IVH rsync Note: Fedora, Redhat and other RPM package installation method;
 Source Package Installation
Tar xvf rsync-xxx.tar.gz
CD rsync-xxx
./configure--prefix=/usr; make and make install Note: You have to install GCC and so on before compiling the installation with the source package;

CPU information for Linux 1. View the number of physical CPUs
#cat/proc/cpuinfo |grep "Physical id" |sort |uniq|wc-l

2. View the number of logical CPUs
#cat/proc/cpuinfo |grep "Processor" |wc-l

3. View CPU is a few cores
#cat/proc/cpuinfo |grep "Cores" |uniq

4. Check the CPU frequency
#cat/proc/cpuinfo |grep Mhz|uniq

Linux Common Operations Command (ii)

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.