Linux shell Command Study Notes (1)

This article will introduce my notes on linux. I hope this method will be helpful to you.

Shell script for obtaining the Server IP Address:

The Code is as follows:	Copy code
#! /Bin/bash Ifconfig | grep 'inet addr: '| grep-V' 127. 0.0.1' | cut-d:-f2 | awk '{print $1 }'

Download the entire site

Wget-mk http://www.bKjia. c0m

Determine whether a file exists

 

The Code is as follows:	Copy code
#! /Bin/bash If [! -F/root/log. l] Then echo "log. l note exist" Fi

Common syntax

While statement

 

The Code is as follows:	Copy code
#! /Bin/bash Echo "enter passwd" Read passwd While [$ passwd! = "Iterse"]; do Echo "sorry try again" Read passwd Done

For statement

 

The Code is as follows:	Copy code
#! /Bin/bash For I in a B c; do Echo "$ in" Done

Case statement

The Code is as follows:	Copy code
#! /Bin/sh Echo "Enter a number" Read number Case $ number in 1) Echo "you number is 1" ;; 2) Echo "yo number is 2" ;; *) Exit 1 ;; Esac

If else elif fi

The Code is as follows:	Copy code
#! /Bin/sh Echo "Is it morning? Please answer yes or no ." Read YES_OR_NO If ["$ YES_OR_NO" = "yes"]; then Echo "Good morning! " Elif ["$ YES_OR_NO" = "no"]; then Echo "Good afternoon! " Else Echo "Sorry, $ YES_OR_NO not recognized. Enter yes or no ." Exit 1 Fi Exit 0