Input file:
$ cat test.txt
one two three four
1 2 3 4
i ii iii iv
Sed code to delete/remove one or more space from a file. (Basically combine one or more space to a single space)
$ sed 's/[ \t]\+/ /g' test.txt > test.txt.1
$ cat test.txt.1
one two three four
1 2 3 4
i ii iii iv
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