Bash Programming Examples

Execute Bash Shell Online

bash

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Execute Bash Shell Online

bash

# Hello World Program in Bash Shel
echo "abc"> abc.txt
cat abc.txt

print_ip_range

bash

cidr="192.168.0.1/24"

# range is bounded by network (-n) & broadcast (-b) addresses.
lo=$(ipcalc -n $cidr |cut -f2 -d=)
hi=$(ipcalc -b $cidr |cut -f2 -d=)

read a b c d <<< $(echo $lo |tr . ' ')
# echo $a.$b.$c.$d
read e f g h <<< $(echo $hi |tr . ' ')
# echo $e.$f.$g.$h


for ip in {$a..$e}.{$b..$f}.{$c..$g}.{$d..$h};
do
    echo $ip
done;

mmmmmmm

bash

# Hello World Program in Bash Shell
mkdir Englishfootball
cd Englishfootball
mkdir EPL
mkdir Division1

teams=(Cardiff Fulham Newcastle Westham Tottenham ManchesterUnited ManchesterCity Watford Sothampton Bournemouth Brighton CrystalPalacer Chelsea Arsenal Huddersfield Everton Burnley Newcastle Liverpool Wanderers)

for team in ${teams[*]}
do
     printf 'This is a little description about %s\n' > $team

done

Execute Bash Shell Online

bash

# Hello World Program in Bash Shell

echo "Hello World!"

Execute Bash Shell Online

bash

echo "System name"
read System
echo "System name is : $System"

Execute Bash Shell Online

bash

#!/bin/bash
i=0

touch zzz
echo "a" >> zzz
echo "b" >> zzz
echo "c" >> zzz
echo "d" >> zzz

b=22

echo "$b" >> zzz




IFS='
' ttt=($(cat zzz))


while [ $i -le 4 ]
do
  echo ${ttt[$i]}
  let i=$i+1
done


echo ""
echo ""
echo "----------"
echo "   zzz    "
echo "----------"
echo ""
echo $(cat zzz)

what_happened

bash

#!/bin/sh

# this is a comment

# let's give some values to variables
SOMETHINGELSE=TTT
DOGS=10
CATS=YELLOW

# if you uncomment the next line the "if" test will will be false
#CATS=ELLO

DOGS=1

echo "Let's do a loop"
for i in 1 2 3 4 5 100 200 112938 019283093 $SOMETHINGELSE $DOGS $CATS
do
  echo "Looping ... number $i"
done


if [ "$CATS" = "YELLOW" ]; then
  whatwesay="By the way, cats are yellow."
else
   whatwesay="what just happend?"
fi

# what do we say?
echo $whatwesay

# echo the "cal" command, defaults to current month
echo
cal

# -3 just prints out three months
echo `cal -3`

# make a blank line
echo

# let's loop through cal!
for x in `cal -3`
do
echo $x
done

what_just_happened

bash

#!/bin/sh

SOMETHINGELSE=TTT
DOGS=10
CATS=YELLOW

echo "Let's do a loop"
for i in 1 2 3 4 5 100 200 112938 019283093 $SOMETHINGELSE $DOGS $CATS
do
  echo "Looping ... number $i"
done


if [ "$CATS" = "YELLOW" ]; then
  whatwesay="By the way, cats are yellow."
else
   whatwesay="what just happend?"
fi

echo $whatwesay

xxxxx

bash

str="#"

for i in 1 2 3 4
do
   echo "$str"
   str="$str #"
done

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