Quotes are really confusing and we don’t know where to use the correct one.
Here I try to describe it in very concise way.
” Double quote: (weak quote)
‘ Forward Tic (strong quote)
` Back Tic: (Located on the left of the 1 key). command substitution.
\ Single character substitution
? Match one character
daya@debian:~$ echo “This is my test on $HOSTNAME”
This is my test on debian
daya@debian:~$ echo “This is my test on \$HOSTNAME”
This is my test on $HOSTNAME
daya@debian:~$ variable1=`ls /home`
daya@debian:~$ echo $variable1—-> list the content of home directory.
daya@daya-laptop:~$ echo ‘This is my $HOSTNAME’
This is my $HOSTNAME
$0 —> program name
$1 —> first argument
$2 —–>second argument
$9—–> 9th argument
$#—–> no. of arguments
$* ——> all arguments