Shell Programming and Scripting

#!/bin/sh
#usblcd clear
while true;
do
tail -1 /root/Myprogs/apurva.log > /root/Download/usr/bin/output.txt
cat /root/Download/usr/bin/output.txt | echo `awk '{if ($3 == "Connection"&&$4 == "Established") print"Connection Established "}
else if {($3 == "DTNCO"&&$4 ==" Sent" && $5="Packet") print"Bundle Sent"}
else if {($3 == "Connection" && $4 == "Closed") print"Connection Closed"}
else if {print"Processing"} ' /root/Download/usr/bin/output.txt`
sleep 1;
done
# Just replace echo with usblcd and it will be done

I would guess that the problem is with the semicolons...
try to remove them.

The problem is with the extra curly braces in the awk script.

Code:

#!/bin/sh
#usblcd clear
while true;
do
    tail -1 /root/Myprogs/apurva.log > /root/Download/usr/bin/output.txt
    echo `awk '{if ($3 == "Connection"&&$4 == "Established") print"Connection Established ";
      else if ($3 == "DTNCO"&&$4 ==" Sent" && $5="Packet") print"Bundle Sent";
      else if ($3 == "Connection" && $4 == "Closed") print"Connection Closed";
      else print"Processing"} ' /root/Download/usr/bin/output.txt`
    sleep 1;
done
# Just replace echo with usblcd and it will be done

I also took out cat, as it didn't seem to have any purpose.

Incidentally, the path name /root/Download/usr/bin looks ... weird. If this is meant to be a temporary file, perhaps you should simply store it in /tmp; or if it is used solely by awk, use a pipeline to awk.

No, the semicolon is a valid delimiter; it's basically equivalent to a newline.