12-07-2008
Change File Header Timestamp
Please I am new to Unix and this simple question I am already answered but struggling to find the answer.
I have a data file which contains header record which conatins date timestamp. I need to find a way of simply updating the date time stamp to current date timestamp.
So if the header record is:
20081206 then I simply want to update it to 20081207 (i.e. today's date).
I would appreciate if someone can either point me to the related link or simply answer the this question by providing simple code. Note I would add this code to an existing shell script.
Thanks.
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LEARN ABOUT PHP
http_cache_last_modified
HTTP_CACHE_LAST_MODIFIED(3) 1 HTTP_CACHE_LAST_MODIFIED(3)
http_cache_last_modified - Caching by last modification
SYNOPSIS
bool http_cache_last_modified ([int $timestamp_or_expires])
DESCRIPTION
Attempts to cache the sent entity by its last modification date.
If the supplied argument is greater than 0, it is handled as timestamp and will be sent as date of last modification. If it is 0 or omit-
ted, the current time will be sent as Last-Modified date. If it's negative, it is handled as expiration time in seconds, which means that
if the requested last modification date is not between the calculated timespan, the Last-Modified header is updated and the actual body
will be sent.
A log entry will be written to the cache log if the INI settinghttp.log.cache is set and the cache attempt was successful.
Note
This function may be used in conjunction with http_send_data(3), http_send_file(3) and http_send_stream(3).
PARAMETERS
o $timestamp_or_expires
- Unix timestamp
RETURN VALUES
Returns FALSE or exits on success with 304 Not Modified if the entity is cached. See the INI settinghttp.force_exit for what "exits"
means.
EXAMPLES
Example #1
A http_cache_last_modified(3) example
Caching for 5 seconds.
<?php
http_cache_last_modified(-5);
printf("%s
", http_date());
?>
SEE ALSO
http_cache_etag(3), the HttpResponse class if you are using PHP 5.1.0 and above.
PHP Documentation Group HTTP_CACHE_LAST_MODIFIED(3)