in sed $ is the last line so to delete the last line:

sed '$d' <file>

in sed $ is the last line so to delete the last line:

sed '$d' <file>

Updated to include a way to delete multiple lines from the bottom of the file:

tac <file> | tail -n +3 | tac > <new_file>

• tac reads the file backwards (cat backwards)
• tail -n +3 reads the input starting at the nth line
• tac reads the input and reverses the order back to the original

in sed $ is the last line so to delete the last line:

sed -e '$d' <file>

in sed $ is the last line so to delete the last line:

sed '$d' <file>