Shell

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:40-49

#read Onefile Line by line forLineinch$(Cattest1.txt); Do Echo$line; Done;# whileReadSplitLine by Space whileRead Line Do forWordinch$line Do Echo$word Done; Donetest1.txt#string Splitor substring input=type=ABCDEFGEcho$input, #get

1. Historical Order (History,↓, ↑,!) )The default value for history is 1000, which is specified in/etc/profilecommand history, which is used to query recent command histories;Use the arrow keys (↑) to query the previous command;Use the arrow keys (↓)

Today, write an incremental backup system file using shell scripts, and review the shell script related commands, which can be used to back up different files or folders for full backups and incremental backups, depending on your needs. Directly on

Recently encountered a problem in the work, want to add a flag bit after the specified location of a file, required to be implemented in the shell script.Problem Description:Want to add a flag after a string of sys_config.fex textFor example, there

Requirements DescriptionIn bash, we can easily split the text using the split command. Now add two points of demand:1. Insert title at the head of each split file for easy viewing.2. The name of the split file is numbered before the source file name,

This is a magical command.TR's whole spell is translate, that is, translation. The interesting thing is that we can make rules for translation. Use the following:TR [option] set1 [Set2]TR accepts input from the standard input and prints the result

There is no millisecond unit of time in a Linux shell, and only seconds and nanoseconds are actually sufficient, since the unit range of nanoseconds is (000000000). 999999999), so the nanosecond is also available from nanoseconds to

Special characters in shell pattern matching * Matches any string (including an empty string). ? matches any single character . [...] Matches any character that is contained.

CCat Zdd Browse the contents of a ZDD fileCat Zdd1 Zdd2 Browsing the contents of multiple filesCat-n ZDD Browse the contents of a file Zdd and display line numbersCD back to the start directory, that is, just logged into the system directory, CD

Variable assignment, substitution, etc. #!/bin/bash#1. Assigning values to a single variableVariable1=33 #将变量variable1赋值为33Echo ${variable1} # #第一种显示方法为 ${variable1}echo $variable 1 # #第二种显示方法为 $variable 1variable2= "Hello World"

#!/bin/bash#1. Integer comparison operators#整数变量和整数常量比较Num1=15["$num 1"-eq] #测试num1是否等于15echo $? # #退出状态为0, means NUM1 equals 15["$num 1"-eq] #测试num1是否等于20echo $? # #退出状态为1, means num1 is not equal to 20["$num 1"-lt] # #测试num1是否小于15echo $? # #退出状态为1,

Http://blog.sina.com.cn/s/blog_6d09b5750100x6zg.htmlThe first is the shell sort implementation of multi-column sorting, here to add a vertical line to split, the following file

This article references: Shell Scripting Learning GuideThis article reads as follows: Know the shell directive, but do not know how to complete an automated shell script.Because when editing this article, the author is also a novice. So, in some

The Cut command extracts text columns from a text file or text stream.Cut grammar[[email protected] ~]# cut-d ' delimited characters '-f fields [[email protected] ~]# cut-c character range Options and Parameters:-D: followed by delimited characters.

#!/bin/sh# desc:setup Linux system security# powered by Www.lvtao.net#account setuppasswd-L XFSPASSWD-L NEWSPASSWD-L NSCDPASSWD-L DBUSPASSWD-L VCSAPASSWD-L GAMESPASSWD-L NOBODYPASSWD-L AVAHIPASSWD-L HALDAEMONPASSWD-L GOPHERPASSWD-L FTPPASSWD-L

Linux series-shell learning notes (Continued 1) process user input,-shell learning notes 1. Run the program with Parameters $0 indicates the program name, $1 indicates the first parameter, $2 indicates the second parameter, and so on until the ninth

Here documentation in Shell, We know thatlinuxCommand Line operations can all be placed in the file. After the executable permission is granted, the file can be changed toshellScript. But if we talk to some programsInteraction,shellScripts cannot

Run the system command and write the shell script that writes the output to the specified log file (2 ), The previous article was a simple script that can be executed and written into logs. However, if it is placed in the production environment, it

Shell exits and returns a summary. Common Responses in shell: exit, breakm, return Exit: In fact, after each command is executed, an execution state is returned! If the execution is successful, 0 is returned. If the execution limit is not