Shell

SQL statement OptimizationI. General steps for SQL optimization(1), through the show status command to understand the frequency of execution of various SQL.(2), positioning execution Less efficient SQL statement-(key Select)(3) Explain analysis of

Ubuntu14.04Given a text, count the number of occurrences of the word# solution 1grep is used in conjunction with AWK and is written as a sh script fre. SH SH fre.sh wordfretest.txt#! /bin/Bash# solution 1if[$#-eq0 ] ThenEcho "usage:$0 args

1. Download the Wordfile extension package from the UE official website: http://www.ultraedit.com/files/wf/wf.zip2. Open the UltraEdit and click on the menu "advanced"-"Configure" To open the Configuration dialog box. Click "Editor

#!/bin/sh# Describe:check the real server status# history:2015-08-25 22:21:38# Author:timPath=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/binExport PATHvip=192.168.1.121dip=192.168.1.112rip= ("192.168.1.122" "192.168.1.123")Vport=8

Emptying files with shell scriptsIn recent projects, a lot of log files are generated, so you need to write a script to empty them manually, here are a few typical ways.Method 1 Code#!/bin/bash##方法1echo "" > $1echo "$1 cleaned up."RunDescriptionI

Talk about the function call, I believe that everyone will not be unfamiliar, but for the beginner shell of me, Shell function call Way is a bit let me not very accustomed to, I also go a lot of detours, because the transfer of parameters when a

1. Write the shell script, calculate 1-100 's and;650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/71/B2/wKiom1XWy-eBa3uqAAENi2u4ldc587.jpg "title=" 1.jpg " alt= "Wkiom1xwy-eba3uqaaeni2u4ldc587.jpg"/>2. Write the shell script, ask for a

#！ /bin/bashAction () {#1, get SVN update output/OPT/SVN/SVN/BIN/SVN update/opt/lampz/apache/web > File_out#2, gets the number of rows through the output file File_outline=$ (wc-l File_out|awk ' {print $} ')#3, if the number of rows is greater than 2

There are a number of ways to intercept strings in the shell, ${expression} There are 9 ways to use them. ${parameter:-word}${parameter:=word}${parameter:?word}${parameter:+word} The above 4 alternatives can be used for default values. ${#parameter}

最近在windows上编辑一些shell脚本后上传到交换机框体上后，这些shell脚本无法执行，每一行结尾都有‘^M‘，同时框体上又没有dos2unix工具，这么多脚本也不可能一行一行来修改，于是就自己写了一个脚本来把当前目录下所有文件中的‘^M‘去掉。#!/bin/shFilename=' ls ' forFinch ${filename}; Do if[- F ${f}]; Then Echo "Delete ' ^m ' and rename file to ${f}1

SIGHUP: This signal is generated to the control process when the terminal disconnects. 1Sigint:ctrl-c or delete is pressed, generated by the terminal driver and sent to all processes in the foreground process group. 2SIGKILL: Causes the program to

grep Basic Usagegrep [Options] [mode] [file:]Options-C outputs only the number of matching rows-I ignore case when searching-H does not display file names when querying multiple files-L searches only for matching file names, not specific matching

Idea: After Nginx starts, there will be a nginx.pid file in the specified location, by judging whether the file exists. Determine if Nginx has been started.#!/bin/bash#this is my first try to test write a shell to control nginx Daemon#History 2015-08

Open a text editor, create a new file, the extension sh (sh for Shell), the extension does not affect the execution of the script, see the name is good, if you write a shell script in PHP, the extension is good with PHP.Enter some

Several key words in the Shell control loop break continue exit#!/bin/bash#在1-loop in the 10 sequence, if the sequence equals 5, the number is not displayed and the loop is interrupted to continue with the successor task.For i in ' SEQ 1 10 'DoIf

1. Write a shell procedure named Xunhuan (with a looping statement), as shown in the results of the operation.0102103210432105432106543210765432108765432102. Write a shell process called Cala, which functions as a small calculator that allows you to

Writing one:#!/bin/bashWhile Read lineDoEcho $lineDone Two:#!/bin/bashCat file (file to be read) | While Read lineDoEcho $lineDoneThree:For line in ' cat file (files to be read) 'DoEcho $lineDoneThe above three kinds of writing are my excerpt from

The Shell also supports functions. The shell function must be defined before use.Definition and invocation of a functionThe Shell functions are defined in the following format:Function_name () { List of commands [return value]}function return

The Linux shell is much more powerful in programming than Windows batch processing, both in loops and operations. Data types are not comparable. Here's a summary of some of the things that an individual does when it comes to working with arrays.1.

A brother in the forum to toss two variables at the same time, do not know how to toss. Later learned that you can use an arrayAll forget the shell and the array.wrote a test program. Record it. I also have an impression in the