shell scripting books

) values in the script after the end of the script, still exist in the current shell, and SH and bash are not, so when doing shell scripting development. If there is a requirement in the script to refer to the contents of other scripts, or to configure the file, use the "." Dot or source to load the script or configuration file at the beginning of the script, and

]shell]#catfun1.sh#/bin/bashread-p "Please enter the network card:" networkip () {ifconfig $network |head-2|tail-1|awk -F ': ' ' {print$2} ' |awk ' {print$1} '}case $network ineth* ) echo "This is the Ethernet NIC," ipaddr= ' ip $network ' echo ' $network IP is: $ IPAddr ";; lo) echo "This is the loopback network card" ipaddr= ' ip $network ' echo "$network IP is: $ipaddr" ;; *) echo "You entered the incorrect, please new input!" ";; EsacExtended

overwrite, the original number of filesAccording to LostC: Append the standard output to the file with >> attached to the program >> files to the endD: Piping "|", PROGRAM1 | Program2 the standard output of the PROGRAM1 as a standard input for PROGRAM2More than two programs can be linked together, but also greatly improve the speed of implementationEg:tr-d ' \ r ' Output to a file in the final sequence.(12) Special documents/DEV/NULL and/dev/tty 46This article is from the "Tabsang Growth Histor

9641716 1% /mysdcComplete.Shell Scripting AutomationAbove, we are using the Fdisk tool to interactively partition the hard disk. So how do we write it into Shell scripting automation. Look back at the sequence of operations that we just entered when we were interactively partitioning, and then read the following script yourself, too simple, nothing to say.#!

Basics of Linux Shell scripting here we first talk about the shell of the basic syntax, the beginning, comments, variables and environment variables, to do a basic introduction, although not related to specific things, but lay the foundation is to learn easily after the premise. 1. Linux Scripting Basics Basic Introduc

Some good habits of shell scripting 1. Naming rules The script name ends with. SH, and names are as famous as possible. Here are a few of the script naming styles that are available for reference. Through the following fresh and refined style, readers can easily understand the role of the script.clearlog.sh clearlog.sh clearsql.sh snmp_install.sh monitor.sh 2.

Bash's script preliminaryShell script: Another form of preserving historical commands;Shell script Programming:What do you mean by programming?Write the program source code.In order to enable users to use the computer, you can let the computer do some tasks in a non-interactive way, you need to make these tasks called a file, so that the computer read sequentially, so as to achieve the function;Programming Languages:Advanced Language:Depending on how

First, using the For loop structureTarget:This case requires writing a shell script chkhosts.sh that uses a for loop to detect the surviving status of multiple hosts, with the following requirements and instructions:1> Ping Detection of 192.168.4.0/24 network segments2> Ping Detection can refer to the pinghost.sh script of the preceding dayThe 3> script can traverse the ping hosts and feed back the surviving statusAfter the test script is executed, th

makefile compiled files./configure--prefix=/usr/local/apache--with=/aa/cc--prefix Specify installation directory,--with specify dependent file directory2.make Compiling makefile FilesMake also needs to be installed, yum install Make,makec,makeg3.make InstallMake install copies the compiled files to the directory specified by--prefix, if not specified, is the current directoryLinux related directory file storage content:The bin is stored in a normal program and can be used by all usersBoot stora

used with variable names, and if the loop body does not include a variable name, a dead loop may occurHow the list is generated:1) Give a direct2) List of pure integersSEQ: Output An integer listseq [First [INCREMENT]] Last3) curly braces unfold{first.. Last}4) return value of the execution result of the command5) GLOBBING6) references to certain variables: [email protected], $*Features of the For loop:1. There is almost no cycle of death;2. The entire list needs to be loaded into memory during

Tags: scripting shell OracleCopy the daily EXPDP export file of an Oracle database to a remote server using shell scriptingZhao Full Text Network name: GuestartWe have a production environment Oracle database, although the daily Rman backup, but also overwhelmed by the developer go out said to restore a few days before the table data into the production environme

process control blocks are recycled and the resources are recycled. Such as: The process is dynamic.Here is the concept of programming language: The programming language is divided into high-level and low-level language, the language is not to say that the higher the better, low-level means that the closer to the bottom, the higher the higher the closer the human natural language, lower-level language execution efficiency will be relatively high. Such as As we can see,

command. You can use Echo to print any variable value in any place where you suspect it is wrong. That's why most shell programmers spend 80% of their time debugging programs. of the Shell programThe advantage is that there is no need to recompile, and it does not take much time to insert an echo command.The shell also has a real debug mode. If there is an error

overwritten.Syntax for input redirection: directives Example: For example, we have a file Test.txt with 3 lines of content. We want to count his number of rows, which can be counted by executing commands: Wc-l Result output: 3Well, through the content of section four, we have mastered the basic use of the shell, can write some simple shell program, but there is a gap between the real coding, so we have to

, The interpreter (interpreter) needs to read the source code that we wrote and convert it to the target (object), which is then run by the computer. Because each execution of the program is more than the compilation process, so efficiency has decreased.The advantage of using scripting languages is that they are mostly run at a higher level than the compiled language and can easily handle objects such as files and directories, and the disadvantage is

be output to the monitor while redirecting files, but generally overwrite the original file content, you can use the-a append contentCode 5-23[Email protected]:/data# date | Tee Textmon Dec 5 06:18:04 CST 2016[email protected]:/data# cat text Mon Dec 5 06:18:04 CST 2016[email protected]: /data# who | Tee text root pts/0 2016-12-05 04:26 (122.90.143.21) [email protected]:/data# cat text root pts/0 2016-12-05 04:26 (122.90.143.21) [Email protected]:/data# date | Tee-a text

Shell script is similar to batch processing under Windows/dos, that is, the use of various commands pre-placed into a file, convenient one-time execution of a program file, mainly for the convenience of administrator settings or management. The advantage of scripting languages over Perl and Python is that it handles the underlying business because there are a lot of Linux commands to support, such as "Alarm

The experience of Shell scripting in developmentThis period of time in the development of a program, program output has a lot of logs. Sometimes you need to log to analyze the problem of the error. Separate viewing efficiency is too low to analyze anything. So I thought of the shell. Log files are on Android's phone!Development environment Fedora, MacOS.Mobile ph

$# The number of arguments passed to the script or function $*/[email protected] All parameters passed to the script or function. When enclosed by double quotation marks (""),[email protected] is slightly different from $* $$ The current shell process ID, which is the process ID for the shell script, which is where these scripts are located

the exponentiation is ^ implementation arithmetic: (1) Let var= arithmetic expression (2) var=$[arithmetic expression] (3) VA r=$ (arithmetic expression)) (4) var=$ (expr arg1 arg2 arg3 ...) when multiplying to translate *, i.e. \* (5) declare–i var = value (6) echo ' Arithmetic expression ' | BcPractice:1. Write script/root/bin/sumid.sh, calculate the sum of the 10th user and 20th user ID in the/etc/passwd file [[email protected] bin] #vim sumid.sh #!/bin/bash u10= ' CA　　　　T-n/etc/passwd |grep