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Am I missing something with for F in $str?
Edit: Yes, I had forgotton to update that varname from a previous approach, and just edited right after posting.
Edit2: Thought, that example doesnt cover...

Please use the "code" tag for code as you have agreed by the forum rules.

Have a look at:
#!/bin/sh
# My system has /bin/sh --> bin/bash, but should be posix compliant

printf "Enter a...