Using "Sleep "

[George Kinley]

for(;
{
print "a";
sleep (1);
}

The above script does not print any thing on console , till I modify
it like

for(;
{
print "a\n";
sleep (1);

}
why?

 

[Paul Lalli]

for(;
{
print "a";
sleep (1);
}

The above script does not print any thing on console , till I modify
it like

for(;
{
print "a\n";
sleep (1);

}
why?

This is known as output buffering. By default, STDOUT is line-buffered,
meaning the printed strings get stored until a newline is reached, at
which point everything is printed. This is controlled by the $|
variable.

Read
perldoc -q buffer
and
perldoc perlvar

to learn more about it.

Paul Lalli

 

[Eric Bohlman]

for(;
{
print "a";
sleep (1);
}

The above script does not print any thing on console , till I modify
it like

for(;
{
print "a\n";
sleep (1);

}
why?

Output buffering. perldoc -q flush will give you the detailed answer and
the appropriate workaround.