Shell

Writing shell code in makefile is a bit weird, unlike shell syntax, and if you don't understand it, it can be confusing to see makefile. Here's a summary of some.1: The code that is the same line after the colon of the target item of the makefile

Shell: The shell is the most straightforward way to operate Linux, interacting with the Linux system through the input commands in the shell.The shell is a small box, each with a separate namespace, the login operation is a shell (possibly bash,zsh,

The ":" in the shellActual case: A section of ===> in the HBase script# for releases, add HBase & WebApps to CLASSPATH# Webapps must come first else it messes up Jettyif [-D "$HBASE _home/hbase-webapps"]; ThenClasspath=${classpath}: $HBASE _homefiif

The SED command usage for Shell Scripting Learning notesBasic usage of SEDSed:stream EditorLine EditorSED: Pattern space Stores matched text content in pattern spaceBy default, the original file is not edited, only the data in the pattern space is

The essence of the shell is to convey a series of commands or signals to the system, usually in the form of a command plus a large string of characters. This string of characters is the character used to express meaning, which is the regular

The essence of the shell is to convey a series of commands or signals to the system, usually in the form of a command plus a large string of characters. This string of characters is the character used to express meaning, which is the regular

-b file If it exists and is a block special file, True-c file If it exists and is a character special file, True-d file if it exists and is a directory, true-e file if it exists, it is true-f file If it exists and is a rule file, True-if the file

The Until loop executes a series of commands until the condition is true. The Until loop and the while loop are just the opposite of the processing mode. The general while loop is better than the until loop, but at some point it is only rare that

The expr command takes an arithmetic expression as a parameter, usually in the following form:expr [number] [operator] [number]Because the shell stores variables as characters, the user must ensure that the operand that participates in the

　　If statementThe judging condition is wrapped up in []If [$a > $b]ThenEcho ' a > B 'elif [$a ThenEcho ' A ElseEcho ' A==b 'Fi　　 for StatementIterating through an arrayFor arr in ${array[*]}DoEcho ${arr}Done while StatementIf the value of the

#!/bin/bash## chkconfig:- the the# Description:tomcat Start/stop/status script#location of Java_home (bin files) export Java_home=/usr/java/jdk1.7. 0_80#add Java binary files to pathexport PATH= $JAVA _home/bin: $PATH #catalina_home is the location

Automatically check for updates every night#!/bin/sh#auto gamedown2 versiondate= '/bin/date +%m%d ' count= ' curl ' Http://11.1.1.1/index.php?m=version&c=auto &a=zheng_count ' var= ' expr $COUNT/10 ' for ((i=1;i>/root/shell/auto/logs/$ Date.logdone0

The shell itself is a program written in C, which is a bridge for users to use Unix/linux, and most of their work is done through the shell. The shell is both a command language and a programming language. As a command language, it interprets and

Linux shell script format#!/bin/sh#..... CommentsCommand...Command...Set permissions after creating with VI chmod +x filename.shExecute command:./filename.shLocal variables in the shellThe declaration of a variable, assignment, without a $ symbol,

IntroductionSed is an online editor that processes a single line of content at a time. When processing, the currently processed rows are stored in a temporary buffer called pattern space, followed by the SED command to process the contents of the

The shell is actually a program that has a special function, mainly to provide a user interface with the kernel to interoperate. It is located between the user interface and the kernel, the workflow is to receive commands entered by the user and

Recently engaged in a shell script to start the jar file with a close jar file. I've got a sore egg. It's finally done this evening.In other words, little brother's Linux is just getting started, after all the information has finally been checked.

The shell is much more programmatic in terms of programming than Windows batch processing, both in loops and operations.Bash supports one-dimensional arrays (which do not support multidimensional arrays) and does not limit the size of arrays.

Method One: Load OD, using ESP law:After the hardware access breakpoint, run four times, and run to fly, then we run three times, to see a lot of pop here:Retn returned and arrived at Oep: Method Two: Direct single-step tracking, tracking

Difference between reverse quotation marks (') and $ () in Shell Echo`Echo\ $ Hostname'//Reverse quotation marksecho $(echo \$HOSTNAME) //$() Someone asked today: Echo 'echo \\\\\\ W' echo $ (echo \\\\\\\ w) Why is