On Sat, Sep 23, 2017 at 2:34 AM, ToddAndMargo <toddandma...@zoho.com> wrote:
> I see ":truncate". This seems liek it will do the trick. > Problem: I would like to read from the file first before > truncating (ro). > > Is there a way to do this, or should I > 1) open the handle with :ro > 2) read what I want from it > 3) close the handle > 4) reopen the handle with :w and overwrite what I want? > You have to do it the long way. I don't think we expose a binding to ftruncate() that would let you open it r/.w, red from it, truncate, and write. That said, there's actually a good reason for that: is it okay to trash the file if something goes wrong? You might prefer to *rename* the old file instead of overwriting, so you can recover if necessary. -- brandon s allbery kf8nh sine nomine associates allber...@gmail.com ballb...@sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net
