unix shell scripting examples

The flexible combination of Linux/Unix Shell and SQL variable transmission greatly improves DBA efficiency, this article provides a few simple examples of passing variables between Linux/Unix shell SQL statements for your reference. Call SQL in Linux/

In Linux/Unix, apart from calling SQL, calling PL/SQL is also a common situation for DBA. The following mainly uses some examples to show how to call PL/SQL under shell. Other related references:Linux/Unix shell scripts call SQL and RMAN scriptsPassing variables between Linu

goes back to maintain the heap of code, it is difficult to forget some special characters. There are too many special rules to be remembered when you fully master bash scripts! In addition, various shell implementations are deeply immersed in various inconsistencies due to complexity. No wonder many people think shell syntax is messy. In short, it will not cause any obstacles to communication with other p

environmental changes to the parent shell. 2. Use parentheses () Running a command in () also opens a child shell. So do not randomly write () in Linux to change the priority, unless it is escaped, and the parentheses after the turn to have a space between the contents of the parentheses. [Email protected] tmp]# echo $BASH _subshell 0 [Email protected] tmp]# (echo $BASH _subshell) 1 ? Description opens a

character class. For example, let's take the IP address. The IP address is divided into four parts. Between each of the two sectionsseparated by '. ', and each section is able to describe the character class and the number qualifier.Watermark/2/text/ahr0cdovl2jsb2cuy3nkbi5uzxqv/font/5a6l5l2t/fontsize/400/fill/i0jbqkfcma==/dissolve/70/gravity /center ">Special characters: 1. \ this character is used for transfer, the above example used in the "." To use the "\" to transfer, or can not be interpr

redirect to generate a patch file:[Email protected]:~/dl$ diff-u version1.txt version2.txt > Version.patch[Email protected]:~/dl$ cat Version.patch---version1.txt 2015-12-28 19:16:28.866869790 +0800+ + + version2.txt 2015-12-28 19:17:12.078872041 +0800@@ -1,5 +1,5 @@This is the original text-line2-line3+lin2Line4Happy hacking!+gnu is not UNIXUse the following command to Patch:[Email protected]:~/dl$ patch-p1 Version1.txt Patching file Version1.txt[Email protected]:~/dl$ cat Version1.txtThis is

Turn from: The world of the Intelligence ReporterThis article combines a number of examples to illustrate how to write a shell script.Why Shell ProgrammingIn Linux systems, although there are a variety of graphical interface tools, sell is still a very flexible tool. The shell is not just a collection of commands, but

at system startup, or if you can shut down these programs correctly when the system restarts, you need to create a run-level script.Run levelDetermine the current runlevel: Who-r (Linux system: RunLevel The first value is the previous runlevel of the system, and the second value is the current runlevel.) ）InittabThe init process starts during the system startup process, which uses the Inittab configuration file to see which services need to be started and which runlevel to enter.Inittab format:

Bash shell scripting Getting Started (ii)Use of the Read commandRole:Use read to assign the input value to one or more shell variables:-p Specifies the prompt to display-T TIMEOUTRead reads the values from the standard input, assigns a variable to each word, and all the remaining words are assigned to the last variableEx.read-p "Enter a filename:" FILE650) this.w

legitimate email address, the work can be done in the Web page JavaScript, or in the website backstage program, such as PHP, Perl, Python, Ruby, Java, or C, all these words? Support for regular expressions, it can be said that the current programming language does not support regular expressions is very rare. In addition to the programming language , many UNIX commands and tools also support regular expressions such as grep, VI, SED, awk, Emacs, and

Learn from this section the main control statements, loop statementsComments, Shell Multiline commentsThe Shell line comment is simple, just add # at the beginning of each line, but he does not provide a special multi-line comment method, so we use a clever way to multi-line comments, using the EOF delimiter to multi-line comments, as follows: 1 #! /bin/sh 2 3 file= "/desktop/file.test" 4 5 5-17 lines

Tags: = = Directory interaction problem type date put. bashrcShell Scriptdking~ sharing1.1 Scripting ConceptsPut multiple commands into a single file to facilitate one-time execution of a program fileUnified Script Storage Directory:/server/scriptsUsing Vim to edit scripts is recommendedTo view the script execution process: Sh-x script1.2 Script editing format:#!/bin/bash#author: DQF#date: 2018/1/11#ver: 1.0#desc: Backup/etc to/backupScript editing

information such as interpreter and author at the beginning of shell scriptAutocmd bufnewfile *.py,*.cc,*.SH, *.java exec": Call Settitle ()"func settitle ()ifExpand"%:e") =='SH'Call Setline (1,"#!/bin/bash") Call Setline (2,"#Author: Yang Yuanqiang") Call Setline (3,"#Blog1: http://aqiang.blog.51cto.com") Call Setline (4,"#Blog2: http://www.cnblogs.com/ivan-yang/") Call Setline (5,"#Time:". Strftime ("%F%T")) Call Setline (6,"#Name:". Expand ("%"))