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For the sake of completeness, Perl solution IMO slightly more elegant than @terdon gave: perl -i -p -e 's/^ID.*$//gsmx if $. > 1' <file>
perl -i -p -e 's/^ID.*$//gsmx if $. > 1' <file>
perl -i -p -e 's/^ID.*$//s if $. > 1' file
For the sake of completeness, Perl solution IMO slightly more elegant than @terdon gave:
