Add space between every letter

Question

How can I add spaces between every character or symbol within a UTF-8 document? E.g. 123hello! becomes 1 2 3 h e l l o !.

• I have

Answer 1

I like these solutions because they do not have a trailing space like the rest here.

GNU awk:

echo 123hello! | awk NF=NF FS=

GNU awk:

echo 123hello! | awk NF=NF FPAT=.

POSIX awk:

echo 123hello! | awk '{while(a=substr($0,++b,1))printf b-1?FS a:a}'