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

Linux--Shell programming one, regular expression 1, regular expression PK wildcard　　　　　　　　2.Basic Regular Expressions1),*The previous character matches 0 or more times~ grep "A *" Test_rule.txt # matches all content, including blank lines~ grep "aa*"

Previously review:File management, user management, rights Management, Bash's basic featuresFile Management: CP,MV,RMUser

^ matches only the beginning of the line$ matches end of line only* A single character immediately after the *, matching 0 or more of this single characters, it can also be a sequence. You can use-to represent a range of character sequences within []

First, condition testThe command test or [can test whether a condition is true, if the test result is real, the exit status of the command is 0, if the test result is false, the exit status of the command is 1 (note the exact opposite of the logical

1-100 the sum of the natural numbers: Law one: For Loop #!/bin/bash#declare-i sum=0for ((i=0;i" | awk "{print $NF}");d o if ["$state" = = ' established '];then let estab++ elif [ "$state" = = ' LISTEN '];then let listen++ else let other++ Fidoneecho

1/etc/profile2 ~/.bash_profile3 ~/.BASHRC4 $PATHWhere/etc/profile is the global environment variable that takes effect for all users, while. Bash_profile only works on the current user.~/.bash_profile: Each user can use this file to enter shell

1. Find the contents of the file (e.g. account number: zh123456): Grep;lsMode 1 Find all Files: grep zh123456 *Mode 2 recursive lookup: ls | Xargs grep zh123456Mode 3 Recursive lookup: Find. -name ' apf44_zswmpay* ' |xargs grep applog|awk-f ": '

1) Use if, case, readExample 1:#!/bin/bash#读取终端输入的字符Read-p "Please input a number:" NN1= ' echo $n |sed ' s/[0-9]//g '#使用if语句进行判断if [!-Z $n 1]Thenecho "Please input a number."Exit 1elif [$n-lt 0] | | [$n-GT 100]Thenecho "The number Ranger is

#!/bin/bash#20170905 input parameter formatecho "displays" Backup Files "Date_0=$1date_1= ' expr $date _0 + 1 'date_2= ' expr $date _0 + 2 '#定义时间段touch-d $date _0/tmp/tm-0.file #开始时间touch-d $date _1/tmp/tm-1.file #结束时间1touch-d $date _2/tmp/tm-2.file

#!/bin/shEcho-n "Login:"Read nameEcho-n "Password:"Read passwdIf ["$name" = "AA"-a "$passwd" = "AAA"];thenecho "right!"else echo "Error"FiOne. the problem with [: missing '] in the running process is ["$name" = "AA"-a "$passwd" = "AAA"] "$name"

ll command to view file informationThe first root represents the creator of the file, and the 2nd root represents the group root that the file belongs toRWX delegate Rights R (read) permission, W (write) write permission, x Execute permission,

Delete the first line in the file file1 to the line containing word characters and redirect to the file File2:Sed ' 1,/word/d ' file1 > File2Keep the lines in the file file1 that contain word characters and redirect to the file File2,-n to indicate

Shell Branch Statement Case inch mode 1) Command1 command2 command3 ; Mode 2) Command1 command2 command3 ;; *) Command1 command2 command3 ;; EsacDescription: After the case is taken, the value is the keyword in,

$# the number of arguments passed to the script$* Displays all parameters passed to the script in a single string. Unlike positional variables, this option parameter can be more than 9 $$ The current process ID number for the script to run $!

What is a function? 1) Basic concept of function functions:function, refers to the code of a separate function as a whole and take a name for it, that is, named code snippet, also known as function; function is an important component of

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

Task required: When I need to compress the files in a folder separately:The original code:1 #!/usr/bin/shell2 function Getdir () {3 forElementinch' LS $`4 Do5 #Echo $element6Dir_or_file=$1$element7 8 #Echo $dir _or_file9

There are several places in the recent new project where you need to invoke the shell script, which records a simple shell script invocation method. The code is as follows:private void Callsh () {InputStreamReader STDISR = null;InputStreamReader

One or one-D arraysBash supports one-dimensional arrays (which do not support multidimensional arrays) and does not limit the size of arrays.Similar to the C language, the subscript of an array element is numbered starting with 0.Second, define the