Re: zsh-ify a bash script

["Andreas Kusalananda Kähäri" <andreas.kahari@abc.se>]

On Thu, Jan 20, 2022 at 11:40:56AM +0100, Mikael Magnusson wrote:
> On 1/20/22, Mikael Magnusson <mikachu@gmail.com> wrote:
> > On 1/20/22, Bart Schaefer <schaefer@brasslantern.com> wrote:
> >> On Wed, Jan 19, 2022 at 12:57 PM zzapper <zsh@rayninfo.co.uk> wrote:
> >>>
> >>> Dumb CLI trick. Wanted to find files containing all of several terms
> >>> (dup2, pledge, socketpair, fork), but they could occur anywhere in the
> >>> file:
> >>
> >> Not zsh any more than the first example, but instead of "grep -l" on
> >> the entire file contents for each term ...
> >>
> >> # start by getting the actual occurrences of all the terms:
> >> find . -name '*.c' | xargs egrep
> >> '\<(dup2|pledge|fork|socketpair.*SOCK_STREAM)\>' /dev/null |
> >> # reduce the results to just file names and search terms:
> >> sed -E 's/(^[^:]*\.c:).*\<(dup2|pledge|fork|socketpair)\>.*/\1\2/' |
> >> # make every search term unique per file:
> >> sort -u |
> >> # discard the search terms, leaving only file names:
> >> cut -d : -f 1 |
> >> # count the number of times each file name appears:
> >> uniq -c |
> >> # print names with a count of 4 (the number of search terms):
> >> sed -nE 's/^ *4 //p'
> >>
> >> Adjusting this for edge cases where two search terms appear on the
> >> same line is left as an exercise.
> >
> > This part would probably be fixed by passing -o to grep (didn't test
> > in the above but):
> > % echo foobar|grep -E '(foo|bar)'
> > foobar
> > % echo foobar|grep -oE '(foo|bar)'
> > foo
> > bar
> 
> I guess this is more or less the same solution,
> % grep -Eo '(zsfree|zerr|subst)' Src/**/*.c|sort -u|sed
> 's/:[^:]*'//|uniq -c|grep -E '^\s+3'
>       3 Src/Zle/zle_main.c
>       3 Src/builtin.c
>       3 Src/exec.c
>       3 Src/glob.c
>       3 Src/hist.c
>       3 Src/jobs.c
>       3 Src/signals.c
>       3 Src/subst.c
>       3 Src/utils.c
> 
> 
> -- 
> Mikael Magnusson

Awk-ifying the end of that pipeline... and just playing around with the
grep a bit for fun (changed to use BREs, but still non-standard due to
-w and -o).

grep -Fwo -e zsfree -e zerr -e subst -- Src/**/*.c |
awk -F: '!seen[$0]++ && ++count[$1] == 3 { print $1 }'

This obviously assumes that no pathname contains colons or embedded
newlines.

-- 
Andreas (Kusalananda) Kähäri
SciLifeLab, NBIS, ICM
Uppsala University, Sweden

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