09-27-2011
Why Linux is not showing file in use ?
Hi
i have written a infinite loop which writes to a file log.txt
while [ 1 ]
do
echo " file in use " >> log.txt
done
i have started this process in one terminal , from another terminal i issued cp command
cp log.txt log2.txt
i was expecting a File in use message but didnt ?
i have checked lines in log2 which is far less than log.txt which is still executing .....
Actually i want to write a backup script which takes backup of our env every day where some or the other files are being used by some process at any given time ....
so can i follow the cp ..? because it was coping even still the file was opened in write mode
or could any one suggest other methods for taking regular backups
any help is much appreciated !!!
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FPRINTF(3) 1 FPRINTF(3)
fprintf - Write a formatted string to a stream
SYNOPSIS
int fprintf (resource $handle, string $format, [mixed $args], [mixed $...])
DESCRIPTION
Write a string produced according to $format to the stream resource specified by $handle.
PARAMETERS
o $handle
-A file system pointer resource that is typically created using fopen(3).
o $format
- See sprintf(3) for a description of $format.
o $args
-
o $...
-
RETURN VALUES
Returns the length of the string written.
EXAMPLES
Example #1
fprintf(3): zero-padded integers
<?php
if (!($fp = fopen('date.txt', 'w'))) {
return;
}
fprintf($fp, "%04d-%02d-%02d", $year, $month, $day);
// will write the formatted ISO date to date.txt
?>
Example #2
fprintf(3): formatting currency
<?php
if (!($fp = fopen('currency.txt', 'w'))) {
return;
}
$money1 = 68.75;
$money2 = 54.35;
$money = $money1 + $money2;
// echo $money will output "123.1";
$len = fprintf($fp, '%01.2f', $money);
// will write "123.10" to currency.txt
echo "wrote $len bytes to currency.txt";
// use the return value of fprintf to determine how many bytes we wrote
?>
SEE ALSO
printf(3), sprintf(3), sscanf(3), fscanf(3), vsprintf(3), number_format(3).
PHP Documentation Group FPRINTF(3)