[其它] 40个简单但有效的Linux Shell脚本示例

#!/bin/bash

echo "Hello World"

$ chmod a+x hello-world.sh

$ bash hello-world.sh

$ ./hello-world.sh

#!/bin/bash

echo "Printing text"

echo -n "Printing text without newline"

echo -e "\nRemoving \t special \t characters\n"

#!/bin/bash



# Adding two values

((sum=25+35))



#Print the result

echo $sum

#!/bin/bash

: '

This script calculates

the square of 5.

'

((area=5*5))

echo $area

#!/bin/bash

i=0



while [ $i -le 2 ]

do

echo Number: $i

((i++))

done

while [ condition ]

do

commands 1

commands n

done

#!/bin/bash



for (( counter=1; counter<=10; counter++ ))

do

echo -n "$counter "

done



printf "\n"

#!/bin/bash



echo -n "Enter Something:"

read something



echo "You Entered: $something"

if 

CONDITION 

then

STATEMENTS

fi

#!/bin/bash

echo -n "Enter a number: "

read num

if [[ $num -gt 10 ]]

then

echo "Number is greater than 10."

fi

#!/bin/bash



read n

if [ $n -lt 10 ];

then

echo "It is a one digit number"

else

echo "It is a two digit number"

fi

#!/bin/bash



echo -n "Enter Number:"

read num



if [[ ( $num -lt 10 ) && ( $num%2 -eq 0 ) ]]; then

echo "Even Number"

else

echo "Odd Number"

fi

#!/bin/bash



echo -n "Enter any number:"

read n



if [[ ( $n -eq 15 || $n -eq 45 ) ]]

then

echo "You won"

else

echo "You lost!"

fi

#!/bin/bash



echo -n "Enter a number: "

read num



if [[ $num -gt 10 ]]

then

echo "Number is greater than 10."

elif [[ $num -eq 10 ]]

then

echo "Number is equal to 10."

else

echo "Number is less than 10."

fi

#!/bin/bash



echo -n "Enter a number: "

read num



case $num in

100)

echo "Hundred!!" ;;

200)

echo "Double Hundred!!" ;;

*)

echo "Neither 100 nor 200" ;;

esac

$ ./test.sh Hey Howdy

#!/bin/bash



for arg in "$@"

do

index=$(echo $arg | cut -f1 -d=)

val=$(echo $arg | cut -f2 -d=)

case $index in

X) x=$val;;

Y) y=$val;;

*)

esac

done

((result=x+y))

echo "X+Y=$result"

$ ./test.sh X=44 Y=100

#!/bin/bash



string1="Ubuntu"

string2="Pit"

string=$string1$string2

echo "$string is a great resource for Linux beginners."

#!/bin/bash

Str="Learn Bash Commands from UbuntuPit"

subStr=${Str:0:20}

echo $subStr

#!/bin/bash

Str="Learn Bash Commands from UbuntuPit"

#subStr=${Str:0:20}



subStr=$(echo $Str| cut -d ' ' -f 1-3)

echo $subStr

#!/bin/bash

echo -n "Enter first number:"

read x

echo -n "Enter second number:"

read y

(( sum=x+y ))

echo "The result of addition=$sum"

#!/bin/bash

sum=0

for (( counter=1; counter<5; counter++ ))

do

echo -n "Enter Your Number:"

read n

(( sum+=n ))

#echo -n "$counter "

done

printf "\n"

echo "Result is: $sum"

#!/bin/bash

function Add()

{

echo -n "Enter a Number: "

read x

echo -n "Enter another Number: "

read y

echo "Adiition is: $(( x+y ))"

}



Add

#!/bin/bash



function Greet() {



str="Hello $name, what brings you to UbuntuPit.com?"

echo $str

}



echo "-> what's your name?"

read name



val=$(Greet)

echo -e "-> $val"

#!/bin/bash

echo -n "Enter directory name ->"

read newdir

cmd="mkdir $newdir"

eval $cmd

`mkdir $newdir`

#!/bin/bash

echo -n "Enter directory name ->"

read dir

if [ -d "$dir" ]

then

echo "Directory exists"

else

`mkdir $dir`

echo "Directory created"

fi

1. Vim 

2. Emacs 

3. ed 

4. nano 

5. Code

#!/bin/bash

file='editors.txt'

while read line; do

echo $line

done < $file

#!/bin/bash

echo -n "Enter filename ->"

read name

rm -i $name

#!/bin/bash

echo "Before appending the file"

cat editors.txt

echo "6. NotePad++" >> editors.txt

echo "After appending the file"

cat editors.txt

#!/bin/bash

filename=$1

if [ -f "$filename" ]; then

echo "File exists"

else

echo "File does not exist"

fi

#!/bin/bash

recipient=”admin@example.com”

subject=”Greetings”

message=”Welcome to UbuntuPit”

`mail -s $subject $recipient <<< $message`

#!/bin/bash

year=`date +%Y`

month=`date +%m`

day=`date +%d`

hour=`date +%H`

minute=`date +%M`

second=`date +%S`

echo `date`

echo "Current Date is: $day-$month-$year"

echo "Current Time is: $hour:$minute:$second"

#!/bin/bash

echo "How long to wait?"

read time

sleep $time

echo "Waited for $time seconds!"

#!/bin/bash

echo "Testing wait command"

sleep 5 &

pid=$!

kill $pid

wait $pid

echo $pid was terminated.

#!/bin/bash

ls -lrt | grep ^- | awk 'END{print $NF}'

#!/bin/bash

dir=$1

for file in `ls $1/*`

do

mv $file $file.UP

done

#!/bin/bash



if [ -d "$@" ]; then

echo "Files found: $(find "$@" -type f | wc -l)"

echo "Folders found: $(find "$@" -type d | wc -l)"

else

echo "[ERROR] Please retry with another folder."

exit 1

fi

#!/bin/bash

LOG_DIR=/var/log

cd $LOG_DIR



cat /dev/null > messages

cat /dev/null > wtmp

echo "Logs cleaned up."

#!/bin/bash



BACKUPFILE=backup-$(date +%m-%d-%Y)

archive=${1:-$BACKUPFILE}



find . -mtime -1 -type f -print0 | xargs -0 tar rvf "$archive.tar"

echo "Directory $PWD backed up in archive file "$archive.tar.gz"."

exit 0

#!/bin/bash

ROOT_UID=0



if [ "$UID" -eq "$ROOT_UID" ]

then

echo "You are root."

else

echo "You are not root"

fi

exit 0

#! /bin/sh



echo -n "Enter Filename-> "

read filename

if [ -f "$filename" ]; then

sort $filename | uniq | tee sorted.txt

else

echo "No $filename in $pwd...try again"

fi

exit 0

#!/bin/bash



echo -e "\n$(date "+%d-%m-%Y --- %T") --- Starting work\n"



apt-get update

apt-get -y upgrade



apt-get -y autoremove

apt-get autoclean



echo -e "\n$(date "+%T") \t Script Terminated"