commandline session $cat pm.sh #!/bin/bash filename=${1##*/} echo $filename $sh pm.sh /bin/bash bash $vim pm.sh $cat pm.sh #!/bin/bash filename=${1} echo $filename $sh pm.sh /bin/bash /bin/bash $vim pm.sh $cat pm.sh #!/bin/bash filename=${#} echo $filename $sh pm.sh /bin/bash 1 $vim pm.sh $cat pm.sh #!/bin/bash filename=${##} echo $filename $sh pm.sh /bin/bash 1 $vim pm.sh $cat pm.sh #!/bin/bash filename=${*} echo …