# -i here update the file, try with and without -i,
sed -i -e '/yourpattern/,$d' file # delete everyhing afer the pattern
sed '/yourpattern/d' file #delete pattern containing line
sed -i -e "/your_pattern/,+2 d" file # 2 lines after the pattern
sed -i -e "5,5d" file # remove 5th line
sed '10,$d' pes.com # delete everything after 10th line
sed '7,36!d' tmp.com > tmp_coord # specific lines to a file
sed -i '$d' file # delete last line
sed -i -e '29,36d' pes.com delete specific lines
sed -i -e '78r../../insert_file' File_you_change.txt #sed interst lines to a file
sed 's/^........//' delete chars 1st to x in ANY line, ... = charachters