%lu means 'insert long unsigned data type here'. In your example, since the width is always positive (IE unsigned) and stored internally as a long (4byte value) a long-unsigned is used. The imginfo definition replaces the %s with the filename, and the two %lu with the width and height of the generated image. However, since this is just a format specifier for a printf function, you cannot place any other % symbols in there and expect different data...
For more details, read up on the C function 'printf' and the format specifier http://www.cplusplus.com/reference/cstdio/printf/ Steve Steve Shipway s.ship...@auckland.ac.nz -----Original Message----- From: rrd-users-bounces+s.shipway=auckland.ac...@lists.oetiker.ch [mailto:rrd-users-bounces+s.shipway=auckland.ac...@lists.oetiker.ch] On Behalf Of Peter Thurner Sent: Wednesday, 19 February 2014 4:57 a.m. To: rrd-users@lists.oetiker.ch Subject: [rrd-users] Question about the %lu (and so on) Hi guys, I was wondering what the %lu stands for, for example in this graphing argument: --imginfo '<IMG SRC=/rrd/%s WIDTH=%lu HEIGHT=%lu >' I found the %s in the man page of rrdcgi, but only examples for %lu and no explicit description of it. Are there any more of those I want to know of? :) Is there a online manual where I can reference those? Also I'd like to ask if #rrdtool on IRCnet is the official channel? I've asked a few questions there the last few days and never got a reply :( Also I can of course understand that the community is not that big ;) Thanks a lot in advance! Peter
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