Note on sed

sed 's/\([0-9][0-9]*\)/\1\.0/g' raw.grades

• Note that sed's delimiter is the character that immediately follows the command option s; it could be any character that doesn't appear in the rest of the operand, such as

• sed 'sX\([0-9][0-9]*\)X&\.0Xg' raw.grades

• or as first used in the example

• sed 's+\([0-9][0-9]*\)+&\.0xg' raw.grades

• The g after the last delimiter is for global, to examine all matches in each line; otherwise, only the first match is used.