On Sat, Jul 03, 2021 at 10:23:39AM +0200, l0f...@tuta.io wrote:
> 2 juil. 2021, 23:30 de dpchr...@holgerdanske.com:
> > $ cat useless-use-of-grep
> > This is the first line: bla bla bla.
> > This is line xxxx: bla bla bla.
> > This is the last line: bla bla bla.
> Here is a better `sed` if you want a all-in-one:
> sed -n /xxxx/{s/bla/foo/p} useless-use-of-grep
Also:
awk '/xxxx/{sub("bla", "foo"); print}' useless-use-of-grep
> > $ time for n in {1..10000}; do perl -ne 's/bla/foo/ && print if /xxxx/'
> > useless-use-of-grep > /dev/null; done
> >
> > real 0m23.624s
> > user 0m14.308s
> > sys 0m10.826s
> I'm not in front of my Linux terminal, can someone launch the `time` command
> for my `sed` above please ? :)
unicorn:~$ time for n in {1..10000}; do perl -ne 's/bla/foo/ && print if
/xxxx/' useless-use-of-grep; done >/dev/null
real 16.034 user 11.555 sys 4.847
unicorn:~$ time for n in {1..10000}; do sed -n '/xxxx/{s/bla/foo/p}'
useless-use-of-grep; done >/dev/null
real 11.489 user 8.670 sys 3.251
unicorn:~$ time for n in {1..10000}; do awk '/xxxx/{sub("bla", "foo"); print}'
useless-use-of-grep; done >/dev/null
real 15.690 user 11.575 sys 4.532
Sed wins this particular race, not surprisingly.
