= elvish
== I/O redirection

echo hi 2>&1 1>/tmp/log   # use stdout for stderr as well
echo hi >/tmp/log 2>&1    # write command output to file

== run command per file

ls | each {|x| echo $x; cat $x } 
each {|f| echo "→" $f } [ (e:ls -1 .) ]

== swap file extension
=== attach different file extension to all files matching regex "owa.pdf"

use str
use re
ls | each {|f| if (re:match ".*owa.pdf" $f) { mv $f (str:join "" [(str:trim-suffix $f "owa.pdf") "owa_calendar_export.pdf"]); } }

=== filepath w/o file extension

fn wo-filext {|f| if (str:contains $f ".") { var i = (str:last-index $f "."); put $f[0..$i] } else { put $f } }

== iterate over a set

VARIANTS=["mceliece348864" "mceliece460896" "mceliece6688128" "mceliece6960119" "mceliece8192128"]
each {|f| cargo test --features $f } $VARIANTS