Shell Programming and Scripting

a 1 2 3 4
b 2 3 4 5
c 12 1232 14 1
d 10 13 4 5
e 1 5 6 9 1

qw
twe
tew
we
qw

a 1 2 qw 4
b 2 3 twe 5
c 12 1232 tew 1
d 10 13 we 5
e 1 5 qw 9 1

nawk '{str1=$0; getline < "test"; print str1" "$0}' test1 | nawk '$4=$NF,$NF=" "'

nawk -v f2=test '{
        if((rc = getline nf4 < f2) != 1) {
                printf("Error processing line %d from input file %s\n",
                        NR, FILENAME)
                printf("  getline < %s returned %d; expected 1: Exitting.\n",
                        f2, rc)
                exit 1
        }
        $4 = nf4
        print
}' test1

awk 'NR==FNR {a[NR]=$0; next}{$(NF-1)=a[FNR]; print}' test test1

awk '{getline x<"f2";$NF=x FS $NF;}1' f1

nawk 'getline $4<f' f=test test1