Shell Simple Script Writing

vim/root/7.sh

#!/bin/bash

X=$[RANDOM%10+1]

Read-p "[1-10] you guessed:" Cai

If [$cai-eq $X];then

Echo, congratulations on your guess.

Exit

elif [$num-gt $X];then

Echo's a big guess.

Else

Echo's too small.

Fi

vim/root/6.sh

#!/bin/bash

Read-p "Please enter a package:" B

b=$ (Rpm-qa | grep "$a")

if [[-Z $b]];then

echo "Not Installed"

Else

echo "Already Installed"

Fi

vim/root/5.sh

#!/bin/bash

Netstat-anptu | grep httpd &>/dev/null

If [$?-eq 0];then

echo "Already started"

Else

echo "No Boot"

Fi

vim/root/4.sh

#!/bin/bash

PING-C3-I0.2-W1 $ &>/dev/null

If [$?-eq 0];then

echo "Host" Up "

Else

echo "Host" Down "

Fi

vim/root/3.sh

#!/bin/bash

[-d/mnt] | | Mkdir/mnt

Mount/dev/cdrom/mnt

vim/root/2.sh

#!/bin/bash

[!-d/mnt] && mkdir/mnt

Mount/dev/cdrom/mnt

vim/root/1.sh

#!/bin/bash

num=$ (who | wc-l)

[$num-gt] && mail-s Errot Root < Mail.txt

Crontab-e

* * * * * */root/1.sh

Vim/mail.txt

The Old king is coming next door.

Ping 176.130.8.50-150, how many are open, how many are not open

#!/bin/bash

X=0

Y=0

For i in {100..150}

Do

Ping-c2-i0.1-w1 176.130.8. $i &>/dev/null

If [$?-eq 0];then

echo "176.130.8. $i is Up"

Let X + +

Else

echo "176.130.8. $i is Down"

Let y++

Fi

Done

echo "Power on the $x, shut down the $y have a"

Seeking 1+2+3+4+5......100 and

#!/bin/bash

Sum=0

For i in {1..100}

Do

Let Sum+=i

Done

echo "Sum $sum"

Find the product of 1*2*3*4......30

#!/bin/bash

Sum=1

For i in {1..50}

Do

Let Sum\*=i

Done

echo "A total of $sum"

/var/log each file, individually packaged, and saved to/TMP

For i in ' Ls/var/log '

Do

tar-czf/tmp/$i. tar.gz/var/log/$i

Done

----------Assist in understanding the packaging process of/var/log/file understanding

For i in A.txt b.txt c.txt d.txt

Do

I=a.txt

tar-czf/tmp/$i. tar.gz/var/log/$i

Done

Using a shell script, guess a random number

#!/bin/bash

Y=0

NUM=$[RANDOM%100+1]

While:

Do

Read-p "[1-100], you guessed a number:" Cai

Let y++

If [$cai-eq $num];then

echo "Kong, you guessed $y times."

Exit

elif [$cai-gt $num];then

echo "Guess big."

Else

echo "small guess."

Fi

Done

Case statement

If the parameter is Redhat, the display is Fedora

If the over parameter is fedora, the display is Redhat

If the parameter is other, the display is useage

#!/bin/bash

Case "$" in

Redhat

echo "Fedora";;

Fedora

echo "Redhat";;

*)

echo "Usage";;

Esac

Case statement (Judgment statement), simplified if statement-----------only two values are equal

#!/bin/bash

Case "$" in

-N)

Touch $;;

-e)

Vim $;;

-c)

Cat $ n;;

-R)

RM-RF;;

*)

echo "Usage:$0 (-n|-e|-c|-r|)" File name

Esac

The shell calls the function----------is to give a command to the individual name (function)

Basic format: Function name () {

Curly braces Middle with command

}

Calling functions: Function names

LL (Ls-l)

#!/bin/bash

Cecho () {

Echo-e "\033[$1m$2\033[0m"

}

Cecho-OK

Cecho Error

Cecho Waring

3 x: is the font color

4 x: is the background color

X: Represents a Style

While statement

Fixed format: While

I=1

While [$i-lt 10]

Do

echo "Hello"

Let i++

Done

Break,contine,exit indirect interrupts to scripts are reused

(1) Break interrupts the entire loop body

(2) Continue interrupt this cycle, immediately jump into the next cycle

(3) Exit interrupts the entire script

#!/bin/bash

For i in {1..5}

Do

[$i-eq 3] && break

Echo $i

Done

Echo OK

#!/bin/bash

For i in {1..5}

Do

[$i-eq 3] && continue

Echo $i

Done

Echo OK

#!/bin/bash

For i in {1..5}

Do

[$i-eq 3] && exit

Echo $i

Done

Echo OK

#!/bin/bash

Sum=0

While:

Do

Read-p "Please enter Number [0 end]:" XX

[$xx-eq 0] && break

Let Sum+=xx

Done

echo "Sum is $sum"

Print 9*9 multiplication table

#!/bin/bash

For i in ' seq 9 '

Do

For x in ' seq $i '

Do

Echo-n "$i * $x =$[$i * $x]"

Done

Echo

Done

Monkey picking Banana

#!/bin/bash

X=1

For i in {1..8}

Do

Let X=x+1

Let X=x*2

Done

Echo $x

Chess

#!/bin/bash

B=1

While [$b-le 4]

Do

For i in {1..4}

Do

Echo-en "\033[40m \033[0m"

Echo-en "\033[47m \033[0m"

Done

Echo

For i in {1..4}

Do

Echo-en "\033[47m \033[0m"

Echo-en "\033[40m \033[0m"

Done

Echo

If [$b-eq 2];then

Echo-e "\033[47m Chu Chu bounded \033[0m"

Fi

Let b++

Done

#!/bin/bash

Read-p "Please enter user name:" Name

Read-p "Please enter user password:" Pass

If [-Z ' $name '];then

echo "must enter user name"

Exit

Fi

pass=${pass:-123456}

Useradd $name

echo "$pass" | passwd--stdin $name

Prompts the user to enter a number: If the input is 10, the script 1+2+3+4.....10

If the input is 20, the script 1+2+3....+20

If there is no input, the script 1+2+3+4......+100

#!/bin/bash

Read-p "Please enter a number:" XX

XX=${XX:-100}

Sum=0

For i in ' seq $xx '

Do

Let Sum+=i

Done

echo "Sum is $sum"

Create file Touch {a,b,c,d}.txt, change the. txt suffix to. doc

#!/bin/bash

For i in ' LS *.txt '

Do

MV $i ${i%.txt}.txt

Done

Change parameters, assign variables

#!/bin/bash

For i in ' LS *.$1 '

Do

MV $i ${i%.$1}.$2

Done

#!/bin/bash

Sum=0

For i in ' SEQ 2 2 100 '

Do

Let Sum=sum+i

Done

echo "$sum"

Sum=0

For i in ' SEQ 1 2 99 '

Do

Let Sum+=i

Done

echo "Sum is $sum"

#tmp =0

Read-p "Shu zi" num

NUM=${NUM:-100}

For i in ' SEQ 2 2 $num '

Do

Let Tmp+=i

Done

Echo $tmp

#!/bin/bash

Case $ in

Start

if [-f/usr/local/nginx/logs/nginx.pid];then

echo "Running"

Else

/usr/local/nginx/sbin/nginx

echo "started successfully"

fi;;

Stop

if [!-f/usr/local/nginx/logs/nginx.pid];then

echo "Closed"

Else

/usr/local/nginx/sbin/nginx-s stop

echo "Closed successfully"

fi;;

Restart

if [-f/usr/local/nginx/logs/nginx.pid];then

/usr/local/nginx/sbin/nginx-s stop

/usr/local/nginx/sbin/nginx

echo "Reboot succeeded"

Else

/usr/local/nginx/sbin/nginx

echo "Reboot succeeded"

fi;;

Status

if [-f/usr/local/nginx/logs/nginx.pid];then

Netstat-ntulp |grep Nginx

Else

echo "Not Running"

fi;;

*)

echo "Error";;

Esac

Shell Simple Scripting