Shell Programming and Scripting

       lftp $Server $Portnum <<End-Of-Session
"$1" "$filename"
bye
        End-Of-Session

#!/bin/bash
######################################################################
#                               Validation
######################################################################
E_ARGERROR=85
if [ -z "$2" ]
then
echo "Usage: `basename $0` Filename-to-upload"
exit $E_ARGERROR
fi

######################################################################
#                               Defaults
######################################################################

Server=${Server:-10.77.40.237}
Portnum=${PortNum:-21}

######################################################################
#                               Functions
######################################################################

#~~~Manually enter paramaters, export or set in this file ftp_interactive #to false to prevent this
ftp_interactive=${ftp_interactive:-true}
function confirm() {
   if [ "$ftp_interactive" == "true" ]; then
eval confirm_contents=\$$1
read -p "Confirm value for \$$1 [$confirm_contents] "
confirm_input
if [ "$confirm_input" != "" ]; then
          eval $1="\"$confirm_input\""
fi
   fi
}

function options(){
echo "Valid options for this are:"
for i in $*
do
echo "    [$i]"
done
}

function execution(){
lftp $Server $Portnum <<End-Of-Session
"$1" "$filename"
bye
End-Of-Session
}


######################################################################
#                              Execution
######################################################################

echo "Please enter a valid ftp servers IP address"
options 10.77.40.237
confirm Server
echo "Enter your ftp servers port number"
options 21
confirm Portnum

filename=$2

if [ "$1" == "get" ]; then
execution get
else
execution put
fi



exit 0

function execution(){

    lftp $Server $Portnum <<End-Of-Session

    "$1" "$filename"

    bye

End-Of-Session
}

     << [-]word
           The shell input is read up to a line that is the  same
           as word, or to an EOF. No parameter substitution, com-
           mand substitution, or file  name  generation  is  per-
           formed  on  word.  The  resulting  document,  called a
           here-document, becomes  the  standard  input.  If  any
           character  of  word  is  quoted,  no interpretation is
           placed upon the characters of the document. Otherwise,
           parameter  and command substitution occur, \NEWLINE is
           ignored, and \ must be used to quote the characters \,
           $,  `,  and  the  first  character  of  word.  If - is
           appended to <<, then all  leading  tabs  are  stripped
           from word and from the document.