Shulou(Shulou.com)06/02 Report--

Functions in 20.16 shell (part I)

The function is to organize a piece of code into a small unit and give the small unit

A name, and the name of the small unit can be called directly when using this code.

1.

[root@hao-01 ~] # vi fun1.sh

Add content:

#! / bin/bash

Function inp () {

Echo "The first par is $1"

Echo "The second par is $2"

Echo "The third par is $3"

Echo "the scritp name is $0"

Echo "the number of par is $#"

}

Inp $1 $2 $3

two。 Execute the fun1.sh script, followed by the function:

[root@hao-01 ~] # sh fun1.sh 1

Functions in 20.17 shell (part two)

1. Addition function:

[root@hao-01 ~] # vi fun2.sh

Add content:

#! / bin/bash

Sum () {

Slots $[$1mm / 2]

Echo $s

}

Sum 1 10

two。 Execute the fun2.sh script:

[root@hao-01 ~] # sh-x fun2.sh

1. Enter the name of the network card and display the network card ip:

[root@hao-01 ~] # vi fun3.sh

Add content:

#! / bin/bash

Ip ()

{

Ifconfig | grep-A1 "$1:" | awk'/ inet/ {print $2}'

}

Read-p "please input the eth name:" ech

Ip $eth

two。 Execute the fun3.sh script:

[root@hao-01 ~] # sh fun3.sh

Please input the eth name: ens33

Arrays in 20.18 shell

1. Define an array:

[root@hao-01] # a = (1 2 3 4 5)

two。 View the elements of array a:

[root@hao-01 ~] # echo ${a [*]}

3. View the value of an element in the array (the array starts at 0 and the value is 1):

[root@hao-01 ~] # echo ${a [1]}

4. Gets the number of elements in the array:

[root@hao-01 ~] # echo ${# a [*]}

5. If the subscript does not exist, an element is automatically added:

[root@hao-01 ~] # a [5] = b

[root@hao-01 ~] # echo ${a [*]}

Array element assignment (change replacement):

[root@hao-01 ~] # a [5] = bbb

[root@hao-01 ~] # echo ${a [*]}

6. Delete array elements:

7. Delete (empty) array values:

[root@hao-01 ~] # unset a

[root@hao-01 ~] # echo ${a [*]}

8. Set the array:

[root@hao-01 ~] # a = (`seq 1 10`)

[root@hao-01 ~] # echo ${a [*]}

9. Starting with the first element, five values are intercepted:

[root@hao-01 ~] # echo ${a [*]: 0:5}

Starting with the second element, five values are intercepted:

[root@hao-01 ~] # echo ${a [*]: 1:5}

10. Starting with the penultimate element, intercept 2 values:

[root@hao-01 ~] # echo ${a [*]: 0-3:2}

11. Intercept and replace, print 8 elements as cc66:

[root@hao-01 ~] # echo ${a [@] / 8/cc66}

twelve。 Replace the element value, and replace 8 elements with cc66:

[root@hao-01 ~] # a = (${a [*] / 8/cc66})

[root@hao-01 ~] # echo ${a [*]}

Replace the element value and replace the cc66 element with 888:

[root@hao-01 ~] # a = (${a [*] / cc66/888})

[root@hao-01 ~] # echo ${a [*]}

20.19 alarm system requirement Analysis

1. Requirements: use shell to customize a variety of personalized alarm tools, but need unified management and standardized management.

two。 Idea: specify a script package that contains main programs, subroutines, configuration files, mail engines, output logs, and so on.

3. Main program: as the entrance of the whole script, it is the lifeblood of the whole system.

4. Configuration file: is a control center that switches on and off subroutines and specifies each associated log file.

5. Subroutine: this is the real monitoring script, which is used to monitor various indicators.

6. Mail engine: is implemented by a python program that defines the server, sender and sender password for sending mail.

7. Output log: the whole monitoring system should have log output.

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