Hi,
I came up with something very similar when looking for tac replacements
yesterday, but had no time to finish things.
But your suggestion is even shorter - I had found "sed -n '1{h;T;};G;h;$p;'
file" or "sed -n '1!G;h;$p'".
That removes the tac dependency, which I agree is a good thing.To chain things up without a temp file one would need the "in-place" features of sed&awk which I'm not sure they are available (awk >=4.1 and only GNU awk). sed -i is only used in validate-abi.sh which might not be used on all platforms to count as "-i is there already so I can use it". And I really don't want to break anyone due to that change, just naively clean up the resulting config a bit. Also we already have a temp file .config_tmp in the same scope and remove it on our own. So it is not that much different to create and remove a second one for that section. Thanks for both of your feedback, submitting v3 now ... Christian Ehrhardt Software Engineer, Ubuntu Server Canonical Ltd On Tue, Jul 5, 2016 at 9:47 PM, Thomas Monjalon <thomas.monjalon at 6wind.com> wrote: > 2016-07-05 17:47, Ferruh Yigit: > > On 6/30/2016 1:00 PM, Christian Ehrhardt wrote: > > > + tac $(RTE_OUTPUT)/.config_tmp > > $(RTE_OUTPUT)/.config_tmp_reverse ; \ > > Now we are adding new binary dependency (tac) to build system > > tac can be replaced by sed '1!G;h;$!d' > >
