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if you don't have the -i option on sed use PERL code below:

perl -i -wlpe 's/TRASH_MAX_SIZE:1024/TRASH_MAX_SIZE:2040/;' config.ini

:b::b:

sed -i "s/TRASH_MAX_SIZE:1024/TRASH_MAX_SIZE:2040/" config.ini

You would/could probably never do what you describe with tr. tr works on a per character basis, not a group of characters (a string). Plus tr means translate, that means:
'change one character to...

Hi,
I posted a sed alternative as well would that work? What are you looking for?

Try:
ls -l | awk '/^d/{split($NF,N,".");print N[2]", "substr(N[1],1,1)}'
or
ls -l | sed -n '/^d/{s/.* \(.\).*\.\(.*\)/\2, \1/p}'