awk
ps aux
field1 field2 "field3a field3b" field4
ps aux | perl -lane 'print join("\t",@F[0..9],@F[10..$#F])' > aa.tsv
ps aux | perl -ane 'print join("\t",@F[0..9]); print "\t@F[10..$#F]\n"' > aa.tsv