Shell

Shell Basicsfirst, what is the shell1. is a command interpreter that provides interaction between the user and the machine2. Support for specific syntax, such as logical judgment, looping3. Each user can have their own specific shell4. Default to

nlShow file line numbernl myscriptPrintfformatting text%[-+]m.nx-The starting position from the beginning of the linem represents the width of the field and N indicates the maximum width of the fieldS: String.C: Character.D: number.X:1 6 binary

Original: http://blog.csdn.net/timchen525/article/details/76474017Problem Scenario:Develop the shell script to determine the size of the system's remaining memory, if less than 100MB, the message to the system administrator, and the script into the

The requirements background is:A business, with 3 servers (A,B,C) Doing load balancing, because the scale is too small to use a professional automated maintenance tool at this time. When there is a new requirement, the development colleague changes

Shell Script Programming Summary (i)Text Processing tool awkAWK is a column-based text Processing tool. It's powerful and has a wide range of applications in shell programming. Here's an example of how awk's common operations are explained.To better

echo commandThe echo command for the Shell is the output for the string.#!/bin/shread name #读取标准输入的行echo "$name It is a test" echo-e "yeah! \c "#-E Open escape \c No Line echo" It is a test "printf commandprintf is used as a formatted string, as

Shell Concept :The shell is a command-line interpreter that provides users with an interface system-level program that sends a request to the Linux kernel to run the program, and the user can start with the shell, suspend, stop, or even write some

Requirements: A total of more than 300 machines, write a script to automatically clean up these two types of machine log files. In the Fortress machine batch release, also want to batch publish to crontab inside.Class A machine log storage path is

BasisThe shell of Spark, as a powerful interactive data analysis tool, provides an easy way to learn the API. It can use Scala (a good way to run an existing Java library on a Java Virtual machine) or Python. Start running in the Spark directory

The task to be done is to process files of a similar format and extract each month and day to the end of each line (cleaned)The idea is to first use the cut command to each line of the month and day of the hour to extract, give a variable, and then

1. Count the number of files in the current folderLs-l |grep "^-" |wc-l2 . Count the number of directories under the current folderLs-l |grep "^d" |wc-l3. count the number of files in the current folder, including subfoldersLs-lr|grep "^-" |wc-l4.

The basic control statement of the if...fi statement, which allows the shell to conditionally make a decision and execute the statement.GrammarIf[]thenStatement(s)ifistruefi Shell expression evaluation. If the result value is true, the given

Enterprise Face question 11:The shell scripts were developed to compare 2 integer sizes in the same way as script arguments and read reads. Alerts users to compare results in a screen-out manner.Note: Altogether is the development of 2 scripts. When

In this article we learned about the use of conditional selection statements in the shell. The next step is to learn the looping statements. In the shell, loops are implemented through the for, while, until commands. Let's take a look at each one

　　 1 #!/bin/bash 2: 　　Shell Common Sense

Recently in the design of a Linux system scenario, write a configuration and log management of the upgrade service program.A total of 4 files, Server a updateserver.conf configuration file and a updateserver script, a updateclinet.conf configuration

Interactive commands: Variable content is determined by the userRead [-PT] Variable-P: Can be followed by a prompt-T: The number of seconds to wait afterecho [-ne] Stringecho [--help] [--version]-N: Do not wrap in the last line-E: If the following

"Must be finished this time" series? Section--linux SHELL script Raiders. (Manual cover face ...) ）1, the simple start. -"The only way to learn a new programming language is to use it to program"Don't think too much, just tap the code:[Email

1.if statements(1) If statement of two-way branch(2) If statement of the multi-path conditional Judgment Branch2. Test statements(1) file test(2) String test(3) Numerical test(4) Test statements combined with logical operators3.case statements4.for

You unity3d developers, you also for your code is anti-compilation headache, confusion and encryption has been invalidated, for memory dump code and worry? Is the hard-to-make game a problem of piracy being copied? Is it feared that the algorithm