sed filter to substitute '!' for periods and '!!' for periods at the end of lines

bash unix scripting sed end-of-line

sed -e 's_\.$_!!_g' -e 's_\._!_g' input_exp

I've used _ instead of / for a slightly higher degree of readibility. You can also use

sed -e 's/\.$/!!/g' -e 's/\./!/g' input_exp

if you want to, of course. \n stands for newline, and is not the same as end of line.

bash unix scripting sed end-of-line

Use $ for 'end of line' inside the regex.

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