Shulou(Shulou.com)06/03 Report--

The requirement is to remotely monitor whether the web is normal.

1) use parameter transfer method

2) the judgment parameter is correct.

3) output prompt

Script practice

#! / bin/sh

# referencing system functions

[- f / etc/init.d/functions] & &. / etc/init.d/functions

# determine whether the input parameters are correct

Usage () {

Echo "USAGE:$0 url"

Exit 1

}

# define variables

RETVAL=0

FunCheckUrl () {

Wget-T 10-- spider-t 2 $1 > / dev/null 2 > & 1 # & > / dev/null

RETVAL=$?

If [$RETVAL-eq 0]; then

Action "$1 url" / bin/true

Else

Action "$1 url" / bin/false

Fi

Return $RETVAL

}

Main () {

If [$#-ne 1]; then

Usage

Fi

FunCheckUrl $1

RETVAL=$?

Return $RETVAL

}

Main $*

# script name: test.sh input parameters: 1, 2, 3

# after running test.sh 1, 2, 3

# $* is "1 2 3" (enclosed in quotation marks)

# $@ is "1"2"3" (wrapped separately)

# $# is 3 (number of parameters)

# 2 > / dev/null error orientation null

# > / dev/null 2 > & 1 is equal & > / dev/null both correct and wrong are oriented null

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