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One way with recent bash versions:

$ a1=( a b c d ) a2=( c d e f )
$ declare -p a1 a2
declare -a a1='([0]="a" [1]="b" [2]="c" [3]="d")'
declare -a a2='([0]="c" [1]="d" [2]="e" [3]="f")'
$...

Another idea if your shuf supports --random-source

$ dd if=/dev/random of=myrand count=1024

$ shuf --random-source=myrand file1
one
three
five
four
two

$ shuf --random-source=myrand...

I agree that it's a nice solution. However, if the first file's content is as advertised (comma-delimited numbers), there's really no need to specify an alternate delimiter; the default \t suffices....

Some process must write the file. Rewrite the process to omit the trailing spaces. Or pipe that process through the sed command as the file is written. As for faster, maybe perl: perl -pe 's/...

Maybe you have files in different subdirectories but with the same filename.
Try counting your unique names to test this theory.
find /somefolder -type f -size -7M -exec basename {} \; | sort |...

perldoc -q count

perl -00 -ne '$count= () = $_ =~ /\bpattern\b/g;print $count' file

Hi.

The command msort is in the Debian repository. One of its features is:
For each key an arbitrary sort order may be specified. Msort also understands locales.
If not in your repository, see:...