On 25/08/2014 at 21:41,
Ole Tange <o...@tange.dk> wrote:
> Great. I think it will make sense to expand the section on --sshloginfile.
Hi,
You have already updated the man file, describing how to keep the server list
up-to-date. Thanks!
I'd like, though, to propose some modifications to the script. Here is the
modified script:
cat original.slf > updated.slf
while [ 1 ] ; do
nice parallel --timeout 10 --nonall -j0 -k --slf original.slf --tag echo
| sed -e 's/\t$//' -e '/\t/d' > tmp.slf
if ! cmp -s tmp.slf updated.slf; then
cat tmp.slf > updated.slf
fi
sleep 10
done
parallel --slf updated.slf ...
Some explanation:
- Changed 'perl' to 'sed' (the former didn't work)
- Added pattern '/\t/d' to remove spurious lines such as (when ssh echoes
some error message):
server.net /usr/bin/xauth: error in locking authority file ...
- 'cmp' instead of 'diff' because it is faster (and silent!)
- '--timeout 10' to make the script more robust (for instance, killing ssh
attempts to servers that ask for password)
- 'cat' instead of 'mv' to prevent changing the file descriptor (I'm not
sure if this affects the way GNU Parallel handles file updates)
--
Douglas A. Augusto
