Linux Shell Command Learning notes (i)

To get the server IP shell script:

The code is as follows	Copy Code
#!/bin/bash Ifconfig | grep ' inet addr: ' | Grep-v ' 127.0.0.1 ' |cut-d:-f2 | awk ' {print '} '

Download Whole Station

WGET-MK http://www.111cn.net

Judge the existence of a file

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"];d o echo "Sorry try Again" Read passwd Done

For statement

The code is as follows	Copy Code
#! /bin/bash For i in a b C; Todo echo "$in" Done

Case statement

code is as follows	copy code
#!/bin/ SH echo "Enter a number" Read number Case $number in         1) &nb sp;       echo "You are 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