Supprimer une ligne et la précedente

sed -n '$p;N;/north-american-letter-white/{d};P;D;' /tmp/diff_printer.dat
sed: Function $p;N;/north-american-letter-white/{d};P;D; cannot be parsed.

$ cat script.sed 
#n
$ p                                    
N                                      
/north-american-letter-white/ {        
    d                                  
}                                      
P                                      
D

$ sed -f script.sed plop 
ligne 1
ligne 4
ligne 7
ligne 8

$

:/tmp # sed -f script.sed diff_printer.dat
sed: Function $ p                                     cannot be parsed.

/usr/bin/ksh: syntax error: '(' unexpected

t=($(<diff_printer.dat)) ; for ((n=0;n<${#t[@]};n++));do case ${t[n+1]} in (*north-american-letter-whit*) ((n=n+1));continue ;; esac ; echo  ${t[n]} ; done

#!/bin/ksh
set -x

t=($(<a8))
for((n=0;n<${#t[@]};n++));do
        case ${t[n+1]} in
                (*north-american-letter-whit*)
                        ((n++));continue ;; 
        esac
        echo  ${t[n]}
done

:/tmp # ./script.ksh
./script.ksh[4]: syntax error at line 4 : '(' unexpected

:/tmp # cat script.ksh
#!/bin/ksh
set -x

t=($(<a8))
for((n=0;n<${#t[@]};n++));do
        case ${t[n+1]} in
                (*north-american-letter-whit*)
                        ((n++));continue ;;
        esac
        echo  ${t[n]}
done