Shell

1. Truncation function file=dir1/dir2/dir3/my. file.txt ${file #*/}: Remove the first/its left string: dir2/dir3/my. file .txt${ file ##*/}: Take out the last/and left string: my.file .txt${ file #*.}: Take out the first. and its left string:

If there are some special characters in the shell, you need to replace them, you can do command substitution, variable substitution, escape substitution1. Substitution of escape charactersThe shell contains the following transfer characters\a Bell

#!/bin/sh#auto Change IP netmask Gateway scripts#wugk 2012-12-17Cat ++++++++ automatically modifies IP and host name information +++++++++Ethconf=/etc/sysconfig/network-scripts/ifcfg-eth0Hosts=/etc/hostsNetwork=/etc/sysconfig/networkdir=/data/backup/

4. Input and output#! /bin/bash# Read users input and then get his nameread"Please input your first name: " firstNameread"Please input your last name: " lastNameecho-e"Your full name is: $firstName $lastName"Read usage:read[-ers][-a 数组][-d

#common. SH, which is mainly some function # perform compiled cleanup work function make_clean {    # $RE _ins  based on the value of the variable, To determine whether to perform cleanup work     if [  $RE _ins == 1 ]; then         make clean >/dev/

The script is: nohup/mnt/nand3/h2000g  >/dev/null  2>&1 &  for & 1 more accurately said file descriptor 1, and 1 The general Representative is Stdout_fileno, which is actually a dup2 (2) call. He outputs the standard output to All_result, and then

The test command usage. Function: Check file and compare value 1) Judge the expression if test (expression is true) if test! expression is false test expression 1–a expression 22 expression is true test expression 1–o expression 22 expression has a

First, the Bash Shell Basic Operations Command 1.type: See if the command is a built-in command of the Bash shell type cd2.Echo: The display of the variable echo $ variable echo name3.unset: Cancels the variable you just set unset name4.Envor SET

Background:The items that are built daily are placed in different folders by date. As today's construction is put into 2015-06-01, tomorrow's will be put into 2015-06-02, and so on. Long time, need a script to delete the folder N days ago. (In this

Introduction to the sceneUse Cygwin under Windows, use Apktool to repackage apk; Way OneCD D:CD path/to/apk/in/dApktool D name.apk Way TwoDrag the file into the Cygwin window to delete the trailing file nameCTRL + ACD SPACEApktool D name.apk Mode

SHELL programmingDirectory:1.shell Brief Introduction2.shell Programming Preparation3.shell Programming Structured Language Building4. OtherTwo examples of 5.shell programmingWrite in front:1.Hello World#！ /bin/bash# This is aexample of bash

First, describeThe Linux system is connected remotely on the SECURECRT terminal, and the HBase shell script is used for distributed database operations, but you cannot modify the script that entered the error using the DELETE key.Second, the

I. Arithmetic operations 1. Let arithmetic operation expressionLet c= $A + $B2. $[arithmetic operation expression]c=$[$A + $B]3, $ (arithmetic operation expression)c=$ (($A + $B))4, expr arithmetic expression, the expression in the operands and

#!/bin/bash# #下面是字体输出颜色及终端格式控制 # Font Color 30-37ECHO-E "\033[30m black word \033[0m" echo-e "\033[31m red word \033[0m" echo-e "\033[32m green word \ 033[0m "echo-e" \033[33m yellow word \033[0m "echo-e" \033[34m blue word \033[0m "echo-e" \033[35m

Problem:The directory structure is as follows:test/2001.01.01/2001.02.02/2001.03.02/2001.01.03/2001.02.04/2001.03.05/2001.01.04/2001.02.05/2001.03.07/2001.01.06/2001.02.06/2001.03.08/2001.01.12/2001.02.23/2001.03.09/2001.01.13/2001.02.26/2001.03.22/2

PengdonglinEmail:[email protected]Development Board: tiny4412adk+s700 4GB FlashHost: Wind7 64-bitVirtual machine: vmware+ubuntu12_04U-boot:u-boot 2010.12Linux kernel version: linux-3.0.31Android version: android-4.1.2In the above we know

Http://blog.chinaunix.net/uid-7553302-id-183648.html1 Shell's $! , $?, $$,[email protected] $n The first parameter,$2 the second ... $# the number of command-line parameters. The name of the current program.

Special characters of shell scripts1. # comment ,#! Besides, echo $ {PATH # *:} parameter replacement does not represent annotation, numeric conversion, and echo $(2 #101011) 2 .; command Line separator. Multiple commands can be written in one line.

Shell script programming (strict terminal format control, beautiful output font color) #! /Bin/bash # font output color and terminal format control # font color 30-37echo-e "\ 033 [30 m black character \ 033 [0 m" echo-e "\ 033 [31 m red word \ 033 [

Shell script programming (fast sorting), shell script programming sorting #! /Bin/bash # implementation of fast sorting in shell script programming (using the rightmost element as the element) a = (8 5 10 3 2 93 4 1 2 3 40 9 61 8 6 29) # a = (0 0 0 0