Shell

Nginx log will increase with the amount of traffic, the larger log will affect the analysis log when the analysis and processing, we can use the shell to the Nginx log timing segmentation, to weeks or days, for a long time log can be deleted

Exercise 1: Counting Memory usageRequirements: Write a script that calculates the amount of memory that is consumed by all processes in the Linux system. (Hint: use PS or top command)Reference Answer:#!/bin/bash# date:2018 February 6 # using top to

Shell script simulates Nginx service startup and shutdownNote: 3 slashes////is followed by a representation of the interpretation of the current statement, which must be removed in the actual script#!/bin/bash///defines which scripting language

Shell Script Basics脚本: 一个可以执行的文件,实现某种功能 – 需要提前设计、智能化难度大 – 批量执行、效率高 – 方便在后台静悄悄地运行Standardize the general composition of shell scripts? #! Environmental Declaration (what procedure to translate the following command)? # comment Text? Executable code

One, pipe and operation control1, the pipe symbol "|", is to put the results of the previous command run to the following command.LS |wc-l; LS |grep test2, how we are editing a file, want to pause this operation and exit can enter Ctrl Z Pause task3.

Using shell functions to develop the Rsync service startup script, previously unprofessional#!/bin/bash#chkconfig: 2345  20 80                         #这两行加入kconfig #description:  saves and restores system entropy  poolsource /etc/init.d/functions   

[TOC] Shell programming (i) a shell introduction 1 concept? Command interpreter2 common shellsbash linux标准shellsh 早期shell，较简单csh ksh tcsh unix shellvi /etc/shells linux支持的shell3 shell scriptsExample 1:#!/bin/bashecho "hello

The article is for personal opinion, please correct me. Before we introduce the shell script, let's begin by understanding some basic concepts. What is a program? Process? The program is a set of instructions plus data, the following diagram

The issue cannot be removed after using HBase shell entry in Xshell:In the HBase shell, the wrong input instructions can not be deleted using backspace and delete, the use of the people know that this is a lot of pits, there is much distress!OK,

1. Execution style of the programProgram Programming Style:Past: Command-centric, data-serving instruction.Object type: Data-centric, instruction serves data.Program programming has the following characteristics:1) Sequential execution: refers to

For statementBasic format:For variable name in condition; Do ...; DoneExample: Traversing a directory or file#!/bin/bashcd/etc/# #脚本中如果查询的目录在多级目录下, first go to the directory, or directly with the absolute path for a in ' ls/etc/' # #遍历目录do if [-D $a

Reference: http://cn.linux.vbird.org/linux_basic/0320bash_1.phpShell variable function : A variable is a set of words or symbols, etc., to replace some configuration or a string of reserved data! Echo This command to take the variable: Echo $PATH,

1. View the currently supported Shell (Linux)$ cat/etc/shells2. Change the shell currently in use$ chsh-s/bin/zsh$ chsh-s $ (which zsh)3. Compare the available zsh have oh my zshAutomatic installation$ wget

The Shell's loop structure has while and for two typesWhile loopWhile following the judgment condition, the judging condition can be more than one, but each judgment condition should be enclosed in a separate [], and then multiple judgments are used

8.6 Pipe symbol and job controlThe effect of a pipe character is to drop the result preceding the symbol to the command following the symbol. Not all commands are available after the pipe character, and generally commands for document operations are

Five week fourth session8.6 Pipe symbol and job control8.7/8.8 Shell variables8.9 environment variable configuration file8.6 Pipe symbol and job controlPipeline compliance with Job controlTasks to stop: jobsMove the task to the front desk: FGTask is

Format: echo "/033[word background color; font color m string/033[control code"If you simply display the font color can be fixed control code bit 0m.Format: echo "/033[word background color; font Color m string/033[0m"Word background color range: 40-

Shell Basics What is a shell? Shell is a command-line interpreter The shell is also a very powerful programming language that can invoke Linux commands directly in the shell How the script executes

Note: If you are the factory of children's shoes, write homework to find this article, I hope you do not copy ^_^, in fact, try to knock on your own will help you a lot.The title requirement is to student.txt the results of each stage of the

The Shell file containsLike other languages, the Shell can also contain external scripts. This makes it easy to encapsulate some common code as a standalone file.The Shell file contains the following syntax format:. FileName # Note number (.)