Shell

#!/bin/bash#? date:2017-10#? version:0.1#? description:db_user= "root" myisam_db= "MySQL" db_passwd= "123456" host= "localhost" backup_dir= "/opt/backup/mysql/sql "Log_file="/opt/backup/mysql/sql/mysql_backup.log "keep_days=30mysql=" $ (which?mysql)

Pipe character and job controlPipe break: The result of the preceding command is passed to the following command by the pipe character.Example [Email protected] ~]# cat/etc/passwd|wc-l43 Job Control: When you run a process, you can use

The Shell's loop structure has while and for two typesWhile loopWhile following the judgment condition, the judging condition can be more than one, but each judgment condition should be enclosed in a separate [], and then multiple judgments are used

8.6 Pipe symbol and job controlThe effect of a pipe character is to drop the result preceding the symbol to the command following the symbol. Not all commands are available after the pipe character, and generally commands for document operations are

Five week third class8.1 Shell Introduction8.2 Command History8.3 Command Completion and aliases8.4 Wildcard Characters8.5 Input and output redirection8.1 Shell IntroductionShell Introduction8.2 Command HistoryCommand-historyHistory environment

Real-time monitoring of the local memory and the remaining space on the hard disk, the remaining memory is less than 500M, the root partition remaining space is less than 1000M send alarm message to the root administrator1 Writing scripts[Email

The echo command of the Shell is similar to the echo command of PHP, and is used for the output of strings. Command format:echo stringYou can use echo to achieve more complex output format control.1. Display Normal string:echo "It is a test"The

Concepts and Variables I. Understanding shell scriptsThe shell is a command interpreter that executes the commands and programs that the user enters in order (the command that encounters the sub-script, which executes the sub-script first) .The

Experimental environmentCommand descriptionThe declare and typeset commands are bash's built-in commands (BUILTIN commands), both of which function exactly the same way to set variable values and properties.Typeset is now deprecated and replaced by

Five Week third session (January 10) 8.1 Shell Introduction 8.2 Command History 8.3 Command Completion and aliases 8.4 Wildcard Characters 8.5 Input and output redirection Shell IntroductionThe shell is a command

Reprinted from Http://www.cnblogs.com/liyuhui-Z/p/7792108.htmlShell IntroductionAs a command language, the shell interprets and executes user-entered commands interactively, and as a programming language, it defines variables and parameters and

1, the database is fully prepared to the hard disk[[Email protected] scripts]$ cat rman_backup.sh  source /home/oracle/.bash_ profile  rman target / log=/home/oracle/backup/backupall_rman.log2. Incremental backup ScriptLevel 0

1211shell High wavesArchive: Learning NotesDecember 11, 2017 13:10:56 Shortcut keys:Ctrl + 1 title 1Ctrl + 2 title 2Ctrl + 3 title 3Ctrl + 4 ExampleCtrl + 5 Program CodeCtrl + 6 Body Format Description:Blue

The Shell file containsLike other languages, the Shell can also contain external scripts. This makes it easy to encapsulate some common code as a standalone file.The Shell file contains the following syntax format:. FileName # Note number (.)

One, Shell Environment View 1.1 View system shell support[Email protected] ~]# cat/etc/shells/bin/sh/bin/bash/sbin/nologin/ usr/bin/sh/usr/bin/bash/usr/sbin/nologin1.2 Viewing the current system default shellMethod OneEcho $SHELL/bin/bashMethod Two[[

1. Write Script/root/bin/sumid.sh, calculate the sum of the ID of the 10th user and the 20th user in the/etc/passwd fileSolution: vim/root/bin/sumid.sh#!/bin/bashTenuser= ' cat/etc/passwd | Head-n10 | Tail-n1 |cut-d:-f3 'Twentyuser= ' cat/etc/passwd

& Method:Unix/linux generally want to let a program run in the background, many use & at the end of the program to let the program run automatically.For example we want to run MySQL in the background:/usr/local/mysql/bin/mysqld_safe--user=mysql

Enterprise Practice question 1: (Production actual case): monitor MySQL master-slave synchronization is abnormal, if abnormal, send sms or mail to the administrator. Note: If there is no master-slave synchronization environment, you can use the

Wrote a shell script on the Liunx, want to call this shell script through Java, do not know how to call, in the Internet said to use process this way, but my executive machine and my shell script is not the same computer, the boss said Java can

Second, the shell sortThe shell sort is also called "Reduced incremental Sort" (disminishing increment sort), based on the insertion sort.The shell suggested sequence is a common but not ideal increment sequence:1,...,n/8,n/4,n/2