display which line returns specific output

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# 1  
display which line returns specific output

I'm trying to figure out a way to find which line in my file.txt with IP addresses:

returns specific result when I execute command affecting all lines.
For example when I run:

for line in `cat file.txt`;
snmpget $line

it displays the results from all lines but I cant tell which line returns which result. Any help on this?
# 2  
for line in `cat file.txt`;
  echo "Line: $line"
  snmpget $line

# 3  
What about adding an echo "This is the line $line"

for line in `cat file.txt`;
echo "This is the line $line"
snmpget $line
echo "-------------------------"

PS:- Oops, I think Bartus and I posted right around the same time Smilie.
# 4  
You get a useless use of cat award with useless use of backticks on the side. There's almost never a good reason to do this when the shell has a faster, simpler builtin without the unpredictable side-effects(data gets silently ignored, or program dies with 'too many arguments', or spaces cause the line to split early, etc, etc, etc)

while read LINE
done < filename

# 5  

Great guys! It works just right!

If it's not too much to ask - is there a way to output the result on the same line:
not like
"result from command"

but as "result of command"

Thanks again for your help!
# 6  
Use printf instead of echo

while read line
  printf $line
  snmpget $line
done < file.txt

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