Shell

1. Install the necessary packages forPkginch 'binutils' 'Compat-libcap1' 'compat-libstdc++-33' 'GCC' 'gcc-c++' 'glibc' 'Glibc-devel' 'Ksh' 'Libaio' 'Libaio-devel' 'LIBGCC' 'libstdc++' 'Libstdc++-devel' 'Libxi' 'libxtst' ' Make' 'Sysstat' Dorpm-qa

Save a copy of the template, then use it for simple parameter processing#!/bin/Bash whilegetopts h:ms option #选项后面的冒号表示该选项需要参数 Do Case "$option" inchh)Echo "option:h, Value $OPTARG"#参数存在 the $optargEcho "Next arg index: $OPTIND";; m)Echo "option:

Alias gives the command a nickname$ C= ' Clear 'CD changes the current path$ cd/etc Change the current path to/etc $ CD back home directory $ CD. Go back to the previous level directory $ CD-back to the directory you just went toCP Copy files or

#1, total number of statistical characters#统计系统中不允许登录的用户数Grep-c ' Nologin '/etc/passwd#2, case-insensitive lookup of all lines of the specified character;Grep-i ' Good ' 9.txt#3, print the line and line number of the specified character;Grep-n "Good"

#!/bin/bash#2017 -07-21 by Max#config PXE#config Yumif [!-D ~/yum.bak];Thenmv/etc/yum.repos.d/* ~/yum.bakElsemkdir ~/yum.bakmv/etc/yum.repos.d/* ~/yum.bakFiCat

Used to write scripts often worried about the big paragraph of the text to My line with "#" to comment, I think the shell is not as smart as C, there are two different ways to annotate. Today I know that I am not smart, I do not see the use of

Environment variables in Linux include system-level and user-level, system-level environment variables are system variables to be read by every user logged into the system, and user-level environment variables are the environment variables that are

Three types of quotes in the shellDouble quotation marks (""): the characters in double quotation marks, except $, "," and \ Nonalphanumeric, are interpreted as characters themselves.1 [email protected]:~#echo"$PATH"2 /usr/local/sbin:/usr/ Local/bin:

Like the rigor of the thought logic of the first few linesThe logic is to learn the code creation is own#!/bin/bash#判断两个整数的大小Read-p "Please enter two integers a B:" A B#或者使用a =$1[-Z "$a"]| | [-Z "$b"]&&{echo "The number you entered is zero"Exit

Advantages: You can run the corresponding *.sh file in other folders, for example, through the putty will default into the folder, you can put the link file there, you can call directly!Method: Very simple1. Right click on the file to create the

transcoding# Dos2unix./test.shPermissions#chmod a+x./test.shGrammarVariableVar= "111"Echo $varEcho ${var}Operationno1=4;no2=5;Let Result=no1+no2echo $result;Self-increment self-reductionLet no++Let no--[] and let similarresult=$[No1 +

In Lua, Os.execute can execute DOS commands, but returns the system status code, which is the default output.Io.popen () can also execute DOS commands, but returns a file. egCopy the Code code as follows:Local T = Io.popen (' svn help ')Local A =

Add the appropriate user account to the Linux service and the initial password is "123456". You can specify a list file for all users, and then write a script named uadduser.sh.[[email protected] ~]# vim/root/users.txt //Create a new list file that

-eq equals, such as: if ["$a"-eq "$b"]-ne not equal to, such as: if ["$a"-ne "$b"]-GT greater than, such as: if ["$a"-gt "$b"]-ge greater than equals, such as: if ["$a"-ge "$b"]-lt less than, such as: if ["$a"-lt "$b"]-le less than equals, such as:

Create a two shell script file. The test1.sh code is as follows:#!/bin/bashurl= "Http://www.cnblogs.com/freescience"The test2.sh code is as follows:#!/bin/bash# use. To reference the test1.sh file. ./test1.sh# or use the following include file code #

The test command in the shell is used to check if a condition is true, and it can be tested in three aspects of numeric, character, and file.Num1=100num2=100if Test $[num1]-eq $[num2]then echo ' two numbers equal! ' Else Echo ' two numbers are

Built-in judgment, when successful returns 0, does not successfully return nonzeroTest-judging expression[Judgment expression] Note must be left blank before and afterNumeric operations-eq equals-ne Not equal to-GT Greater than-ge greater than or

Want to write a script, found that all forget, egg pain, while recalling the side of the writing, finally finished, affixed to the following:1#!/bin/Bash2 #Program:3 # can help you quickly redeploy the project4 #History:5# ./ ,/TenShichaogeng First

The hill sort was proposed by D.l.shell in 1959, and the relative direct ranking has been greatly improved. Hill sort is also called narrowing the incremental sortBasic idea:First, the entire sequence of records to be sorted into a number of

The code is as follows:public class Shellsort {public static void Sellsort (Datawrap [] data) {System.out.println ("start sort:"); int length = Data.lengt The h;//h variable holds the variable increment int h = 1;//The maximum value of the increment