what is the sed command to swap 2 character strings in the same 1 line

example input file: 03-06-2016 output file: 2016-03-06


Oops – this editor lost the backslashes in front of ALL the left and right parentheses in the above. Kindly insert them while I figure out how to deal with this editor! Dick S.

You need to use the substitute command, match and mark stuff on the left with ( ) and recall it on the right with \1 \2 \3, etc. In this case sed -n ‘s/([0-9][0-9])-([0-9][0-9])-([0-9][0-9][0-9][0-9])/\3-\1-\2/’ <inputfile. Untested. Dick S.

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