Shell

File22924 183.136.221.76 20020747 119.146.204.15 20019563 61.182.133.37 20019150 112.85.218.29 20018002 113.106.128.3 200123 113.106.128.3 200 File B113.106.128.31.1.1.161.182.133.37 Ladies and gentlemen, how can we print out all the records of

Simple shell scripts for tasks without variables are generally competent. However, when executing some decision-making tasks, it is necessary to include the IF/then condition judgment. Shell script programming supports such operations, including

The case expression can be used to match a given string, not a number (do not confuse switch... case in C ). Case... in...) do something here esac The file command can identify the file type of a given file, for example, file lf.gz. The output

FTP-I-v-n FTP download, open IP port is the connection server, User Username Password is the login, CD/admin is the CD to the Admin directory under the FTP server, LCD D: /Shell/data is used to change the local working directory to the

Compare shell strings and determine whether the string is a numberBinary comparison operator, which compares variables or numbers. Note the difference between numbers and strings. ◆ Integer comparison -EQ equals to, for example, if ["$ A"-EQ "$

InShellProgramming.You can use parameters.ShellLocation and Internal Parameters 1 ,Location parameters The parameters provided by the system are called location parameters. The value of the location parameter can be used $ N Get, N Is a

Introduction: for some programs that need to run for a long time (such as server programs), it is necessary to write a monitoring program to enable automatic restart upon unexpected exit. This function can be implemented through a simple shell

ShellColor in   1) Concept ANSIEscape code to control the display format ToCSI(Control sequence indicator). Select graphicRendition, Select image reproduction   2) Csin [; k] m N/KDefine the selected display control,MTableSGREscape

Command line parameters, Positional Parameter $0Complete program name(BasenameCommand to remove the path) $1The first parameter, exceeding9Hour$ {10} $ #Number of parameters $ *All parameters in the command line, as a word $ @All parameters in the

1 If #!/bin/bashecho "Please chose your favourite fruit:";select fruit in "apple" "orange" "banana" "none";dobreak;done;if [ $fruit == "apple" ] then echo "you like apple!"elif [ $fruit == "orange" ] then echo "you like orange!"elif [ $fruit ==

Awk uses shell variables, and shell obtains the variable values in awk. 09:36:28 | category:Linux | font size subscription Original article: http://renyongjie668.blog.163.com/blog/static/16005312011829102025222/ I think inLinuxLowerAwkIt is a good

Method 1: (take the copy and generate key after OpenSSH compilation as an example) #! /Bin/bashdir_path = $ home/sshdfilecp sshd $ dir_path/sbincp scp sftp ssh-add ssh-Agent ssh-keygen ssh-keyscan $ dir_path/bincp sftp-server ssh-keysign $ dir_path/

1. Read options Read can have eight options:-A,-D,-E,-N,-P,-R,-T, and-s. -: Read the content into the value echo -n "Input muliple values into an array:"read -a arrayecho "get ${#array[@]} values in array" -D: Delimiter, that is, the delimiter.

In awk programming, do not forget that awk processes regular expressions. There are many internal functions, especially string processing functions. Calling these functions can reduce the workload. 1. Format // Note \ There cannot be spaces behind

// Shellsort (shell sorting) // PC/Ultraviolet IDs: 110407/10152, popularity: B, success rate: average level: 2 // verdict: accepted // submission date: 2011-05-27 // UV Run Time: 0.656 S // copyright (c) 2011, Qiu. Metaphysis # Yeah dot net /// how

Under the current path Ls-altr Space and sky are both folders, and the rest are files. The directory structure is as follows: 1. List all folders in the current path Ls-L | grep ^ d 2. count the number of folders in the

Chapter 9: Use the editor 1. Vim Editor (For more details, see #1, #2, #3) Start:Vim or Vim File Two editing modes:Normal Mode and insert mode. Normal Mode is enabled by default. Move the cursor: H: 1 character left J: move down a row K: Move up a

1. condition test Two formats: test condition or [condition] (Note that spaces are added on both sides)Condition can be a logical operation of multiple sub-conditions. The logical operator numbers include: -A logic and -O logic or ! Logic No &, | 2.

Shell scripts are used to record some exercise questions and shell scripts I have actually written here for learning and querying. User input y or y ends While Mode#! /Bin/bashRead-P "input you choice:" CWhile ["$ C "! = "Y"-a "$ C "! =

The case statementthe case statement is good alternative to multilevel if-then-else-fi statement. It enable you to match several Values against one variable. Its easier to read and write. Syntax: case $variable-name in