Demo.sh

#!/bin/bash

<< commnt
echo 'Hi           All'
echo -e '\033[0;31m Success message here' # color message red
echo -e '\033[0;32m Success message here' # color message green
echo -e '\033[0;33m Success message here' # color message yellow

work="rakesh"
var="singh"
echo "I am ${work} ${var}"

echo ${OSTYPE}
echo ${HOME}
echo ${PATH}
echo ${$}
echo ${SHELL}

sleep 30
echo ${SECONDS}

read -p " Enter your passwd " -s passwd
echo
echo "your password is ${passwd}"
echo

echo "my name is $1 and age is $2"

echo $#
echo $@
echo $*

pwd
currnt_working_Dir=$(pwd)
echo "${currnt_working_Dir}"
date_time=$(date +"%D-%T")
echo ${date_time}

name="my name is Rakesh"
echo "${name}" #my name is Rakesh
echo "${name^}" #My name is Rakesh
echo "${name^^}" #MY NAME IS RAKESH

echo "${name,}" # my name is Rakesh
echo "${name,,}" # my name is rakesh

echo "length of the string is ${#name}"


name="asdfgheyahdgdkj"
echo "${name:0}"
echo "${name:1}"
echo "${name:3}"
echo "${name:1:4}"
echo "${name: -3}"
echo "${name#s*g}" # short
echo "${name##s*g}" # long
echo "${name%g*j}" # ending short
echo "${name%%g*j}" # ending long

string="abcdrakeshabcxyz"
echo "${string/abc/sss}"
echo "${string//abc/sss}"
echo "${string/abc}"
echo "${string//abc}"
commnt