#!/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
#!/bin/bash
i=0

while [ $i -le 2 ]
do
echo Number: $i
((i++))
done

#!/bin/bash
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

#!/bin/bash
echo "Total arguments : $#"
echo "First Argument = $1"
echo "Second Argument = $2"

$ ./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
使用eval编写此程序以提高bash脚本编写技能。

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"