Jeff Frost <jeff@frostconsultingllc.com> writes:
>>> ls -tp /pg_xlog/ | grep -v "backup\|/" | head -1
>>
>> What does the -p and \| pipe check do? We don't have named pipes in
>> that directory, do we?
> The -p shows forward slashes after directories and the \| acts as an or and
> the / following that just lets us filter directories out.
This seems both overly cute and wrong, because it fails to filter plain
files that might have a new mtime but aren't WAL files. I'd suggest a
simple test on file name to make sure it looks like a WAL file, ie,
24 hex digits.
ls -t .../pg_xlog | grep
'^[0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F]$'
|head -1
regards, tom lane
