how to immediatley flush output

[AlbertAguirre]

I have a shell script that processes information in a for loop.
The loop has an echo statement that displays each record. The problem is that the output is displayed when the for loop and script end.
I would like the output of each line to display to the screen during the loop.

How do I flush the output and have it echo the data to the screen on the fly?

 

[PHV]

What is your actual code ?

Hope This Helps, PH.
FAQ219-2884
FAQ181-2886

 

[AlbertAguirre]

Heres a simplified version

for row in `traceroute $1 | tr " " "~"`
do
output=`echo $row`
echo "$output <br>"
done

The above script will display the results after the script is complete.
I want it to display each line as it is retrieved BEFORE the script ends.

How?

 

[PHV]

What about this ?
echo "$output <br>" [!]>/dev/tty[/!]

Hope This Helps, PH.
FAQ219-2884
FAQ181-2886

 

[AlbertAguirre]

Wow! Good try but doesnt seem to work. I didnt even think of that.
Any other ideas?

 

[AlbertAguirre]

OMG!! I found it.

Because I am using quotes in my echo statement, it causes the output to buffer.

This works, no buffering:

for row in `traceroute $1 | tr " " "~"`
do
echo $row
echo \<br\>
done

 

[AlbertAguirre]

no no no never mind... It doesnt work. Sorry!

 

[AlbertAguirre]

It just cant be done.

This is why:

for row in `traceroute $1`
do
echo $row
done

the 'traceroute $1' must finish before the loop is started.
Its buffering the command output NOT the loop output.

 

[PHV]

And what about this ?
traceroute $1 | while read row
do
output=`echo $row | tr " " "~"`
echo "$output <br>" >/dev/tty
done

Hope This Helps, PH.
FAQ219-2884
FAQ181-2886