After a bit of testing I found out today that IIS Output Caching will not work unless the Accept request header includes */*;  Most browsers include this by default but if you make HTTP calls yourself (for example, using CFNetwork from iOS), you’ll need to include it.  For example:  Accept: …

Sometimes when using GCD, it’s useful to cancel a block that’s already been placed on a queue to be processed. You could have a field named “isCancelled” that the block can check for but if you have lots of blocks you’d have to have a field for each block (or …

It’s recommended these days to use the UUID of a mdadm based raid partition in your fstab.  This is fine for a single server but if you have dozens of identical servers, it’s a pain to have to maintain different fstabs for each server. Ideally you want your fstab to …

Parted doesn’t provide an easy way to renumber your partitions after you delete one and fdisk doesn’t support GPT. Fortunately gdisk can do this relatively easily: sudo gdisk /dev/sdc p (print/show) s (sort) p (print/show) w (write) q (quit)