countingpine · October 7, 2025 12:30
diff --git a/commas.sh b/commas.sh
 #!/bin/bash
 # add commas to all numbers in piped data (four digits or more, no leading '.')

 sed -E '
 :a                                                  # (repeat label)
 s/(([^.0-9]|^)[0-9]+)([0-9]{3})([^0-9]|$)/\1,\3\4/; # replace nnn...nnn with nnn...,nnn (if no decimal point before the start)
 t a                                                 # repeat until no more matches
 '
	#!/bin/bash
	# add commas to all numbers in piped data (four digits or more, no leading '.')

	sed -E '
	:a # (repeat label)
	s/(([^.0-9]\|^)[0-9]+)([0-9]{3})([^0-9]\|$)/\1,\3\4/; # replace nnn...nnn with nnn...,nnn (if no decimal point before the start)
	t a # repeat until no more matches
	'
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