how to pass "one" argument and use it twice in "xargs" command
If you can't change the input format, you could set the delimiter to a space:
$ echo -n {0..4} | xargs -d " " -I@ echo @,@0,01,12,23,34,4Otherwise, change the input to separate the tokens with a newline:
$ printf "%s\n" {0..4} | xargs -I@ echo @,@0,01,12,23,34,4The reason for this syntax is explained in man xargs
-I replace-strReplace occurrences of replace-str in the initial-arguments with names read fromstandard input. Also, unquoted blanks do not terminate input items; instead the sep‐arator is the newline character. Implies -x and -L 1.So you must set the delimiter manually to a space if you want to delimit fields.