Shell

This article mainly introduced 8 practical shell script sharing, this article has given the judgment input number character, the character or other, asks the average, the self decrement output, adds the prefix in the file, the batch test file

This article mainly introduces the shell script to empty more than 1G log files, this article directly gives the implementation code, the need for friends can refer to the following A question about how to automatically delete a specified file

A basic Bash shell command (based on Ubuntu implementation) The/etc/passwd file contains a list of all system user accounts and basic configuration information for each user. Man commandEnter the man command before the name of the tool you want to

Shell echo display in script with color display , echo display with color, need to use parameter- e The format is as follows: echo-e "\033[ word background color; text color m string \033[0m" 　　For example:echo-e "\033[41;36msomething here \033[0m"　　

Logical judgments in shell scriptsIf logic is judged. The basic syntax for if judgment in the shell is:1) without ElseIf judgment statement; then COMMANDFIFor example:[email protected] sbin]# cat if1.sh#! /bin/bashread-p "Please input your score:

While loop1)While CONDITION; DoStatementStatementDoneWrite a script that calculates 1---100 of the AND#!/bin/bash#Sum=0I=1While [$i-le 100]; DoLet sum= $sum + $iLet i= $i +1DoneEcho $sum2)While true; DoStatementStatementDone#!/bin/bash#While true;

Set is a shell internal command to turn shell feature properties on or off, and if nothing is added, the user-defined variables and environment variables are displayed directlySyntax: Set [Options ...]Options:- F : Disable wildcard characters+f :

Shell Exercise Training Sum of 2 numbers Calculates the 1-100 and Change the extension of all files in a directory to Bak Compile all. c files in the current directory: Print root can use the number of executable files to process the

1. Write a scriptThe script can accept more than one file path as a parameter;Displays the number of rows held by each file;Shows how many files have been executed for the number of rows this time.#!/bin/bashfor file in $*; Do lines= ' wc-l $file |

Symptom: In terminal direct Cd/var normal, execute in shell script is error. The reason is that the script is written under the Windows platform, and the line break is different from Linux, causing the script to not execute correctlyThe cause of bad

The Linux shell can be user-defined functions and can be called casually in shell scripts.The functions in the shell are defined in the following format:[Function] funname [()]{action; [return int;]}Description 1, can be with function fun ()

6.1Given a user, determine if its UID and GID are the same "^ $USERNAME \>" (first word at the beginning of the line)If it does, the user is displayed as "good guy";#!/bin/bash#USERNAME =user1If!grep "^ $USERNAME \>"/etc/passwd &>/dev/null;then user

Use the shell implementation to check the memory size, if it is displayed within the set value, send an email alert Configure Outgoing Mail firstVi/etc/mail.rcAdd the following information # for Linux and BSD, this should is Set.set

Http://www.cnblogs.com/52linux/archive/2012/03/24/2415082.htmlScenario One: Modify environment variables for Linux serversWith Linux, there is a. bash_profile configuration file under the user root, which is only valid for the current user. Modify

With Crontab you can execute a shell script or a series of Linux commands at a specified time. For example, the system administrator schedules a backup task to run every dayEntry# crontab–eThis allows you to open your personal crontab profile in

Article from my personal blog: (Linux shell) Chapter II-The Joy of command (a)In the previous chapter, we described some of the syntax that some Linux shells need to be aware of. Next we begin to understand the frequently used commands of the Linux

1, write a script to complete the following functions(1) Pass a disk device file path to the script to determine whether the device exists;(2) If present, displays all the partition information on this device;#!/bin/bash## finddev.sh# pass a disk

Linux network configuration and SSH and Shell basicsFirst, the Linux network configuration The ifconfig command is used to configure and display network parameters for network interfaces in the Linux kernel. The NIC information configured with the

Arrays ArrayVariables: Storing the memory space of a single elementArray: A contiguous memory space that stores multiple elements, which is equivalent to a collection of multiple variables that support sparse formatting, which is a discontinuous

This article does not have the technical content, also not big on, but think, still write down, certainly someone will use to get.Often play system friends, should know the Shell instructions, this is a very fun and magical instructions. With it,