UNIX for Dummies Questions & Answers

awk '/pattern/{
 for(i=d-3;i<=d;i++){ print a[i] }
 for(o=1;o<=4;o++){ getline;  print}
 delete a
 d=0
}
{ a[++d]=$0}' file

awk '/pattern/ {
     for ( i = d - 2; i <= d; i++ ) { print a[i] }
     print
     for ( o = 1; o <= 4; o++ ) { getline; print}
     delete a
     d=0
}
{ a[++d] = $0 }' file

no before 1
no before 2
before 1
before 2
before 3
FINDME
after 1
after 2
after 3
after 4
no after 1
no after 2

before 1
before 2
before 3
FINDME
after 1
after 2
after 3
after 4

awk 'c-->0;$0~s{if(b)for(c=b+1;c>1;c--)print r[(NR-c+1)%b];print;c=a}b{r[NR%b]=$0}' b=3 a=4 s="pattern" file