2011/10/25 Richard W.M. Jones <rjo...@redhat.com>: > On Tue, Oct 25, 2011 at 08:33:28PM +0200, Michał Piotrowski wrote: >> 2011/10/25 Chris Adams <cmad...@hiwaay.net>: >> > Once upon a time, Michał Piotrowski <mkkp...@gmail.com> said: >> >> I created feature page >> >> https://fedoraproject.org/wiki/Features/F18MorePortableInterpreters >> > >> > I strongly object to this "feature". /bin/sh is a Unix standard back to >> > IIRC around 7th Edition, and there is NO good reason to break it. The >> > "#!/usr/bin/env foo" suggested replacement has always been a hack to >> > work around broken systems, not something suggested for all scripts. >> >> What is wrong with >> #!/usr/bin/env interpreter >> from technical POV? > > This is what's wrong: > > $ cat > sh.sh > #!/bin/sh > $ cat > env.sh > #!/usr/bin/env sh > $ chmod +x sh.sh env.sh > $ time for i in $(seq 1000); do ./sh.sh; done > > real 0m2.737s > user 0m0.750s > sys 0m1.519s > $ time for i in $(seq 1000); do ./env.sh; done > > real 0m3.677s > user 0m1.013s > sys 0m2.296s >
Yeah, it is noticeably slower - about 0,00094s. > Rich. > > -- > Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones > virt-p2v converts physical machines to virtual machines. Boot with a > live CD or over the network (PXE) and turn machines into Xen guests. > http://et.redhat.com/~rjones/virt-p2v > -- > devel mailing list > devel@lists.fedoraproject.org > https://admin.fedoraproject.org/mailman/listinfo/devel -- Best regards, Michal http://eventhorizon.pl/ -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
