BEGIN {
  sum = 0;
  product = 1;
  sumAvg = 0;
  count = 0;
}

{sum = sum + $1;}

{product = product * $2;}

{sumAvg = sumAvg + $3;
 count++;
}

END {
  average = sumAvg / count;
  printf("Sum of column 1: ");
  print sum;
  printf("Product of column 2: ");
  print product;
  printf("Average of column 3: ");
  print average;
}
 

This awk script prints a histogram the size of the first data field in the file.
 {
   for (i = 0; i < $1; i++) {
     printf(" ");
   }
   printf("*");
   printf("\n");
 }
 

This awk script uses the versatility of relational arrays.
{
germTime[$1] += $2;
numPlant[$1]++;
}

END {
  for(plants in germTime) {
    printf("The %s's average germination ",plants);
    printf("time was %4.1f days.\n",germTime[plants] / numPlant[plants]);
  }
}
 

This awk script does the sum of positive and negative numbers from a file.
{
for (i = NF; i >= 1; i--) {
  printf($(i));
  printf(" ");
}
printf("\n");
}
BEGIN {
  sumPos = 0;
  sumNeg = 0;
}

{
  for (i = 1; i <= NF; i++) {
    if($(i) >= 0) {
      sumPos = sumPos + $(i);
    }
    else {
      sumNeg = sumNeg + $(i);
    }
  }
}

END {
  printf("Sum of positive numbers: ");
  print sumPos;
  printf("Sum of negative numbers: ");
  print sumNeg;
}
 

This is a combination of a shell-script that calls an awk script to print the user information from the yp password file.
#!/bin/csh -f

# Shell script to call an awk script to print out the information
# about a user found in the /etc/passwd file.

# Check number of arguments

if ($#argv == 0) then
    echo "usage: userinfo user-name ..."
    exit 1
endif

# Run the awk script on the input

foreach f ($argv)
    ypmatch $f passwd | awk -f userinfo.awk
end

BEGIN {
  FS = ":";
}

END {
  printf("username:         %-30s\n",$1);
  printf("password:         %-30s\n",$2);
  printf("uid:              %-30s\n",$3);
  printf("gid:              %-30s\n",$4);
  printf("real name:        %-30s\n",$5);
  printf("home directory:   %-30s\n",$6);
  printf("login shell:      %-30s\n",$7);
}