Shell Programming and Scripting

#!/bin/sh
length=$(awk '{n++}END{print n}' file )
width=$(awk 'NR == 1 { print NF }' file )
width=$( expr $width / 3 )
 
for ((i=1; i <= length; i++))
do
for ((j=1; j <= width; j++))
do
a=$(expr 1 + \( \( $j - 1 \) \* 3 \) )
b=$(expr $a + 2)
awk -v i=$i -v a=$a -v b=$b 'NR == i { for (k = a; k <= b; k++ )if ( $k > max) max = $k } END { print max}' file >> out
done
done

awk '
   { for(i=1;i<=NF;i++) {
      max=$i>max?$i:max;
      if(!(++cnt%3)) {
          print max;
          max=-999;
   }}}
   END { if(cnt%3) print max }' file

awk '                                                                        
function max (a, b) {    
  return a>b ? a : b;   
}                     
{ for (i=1; i<=NF; i+=3) {
    printf max( max($i, $(i+1)), $(i+2)) " "
  }   
  print ""                               
}
' INPUTFILE

tr -s ' \t' '\n\n' < file | awk '$0>max+0 {max=$0} !(NR%3) {print max; max=0}' > out

$ cat data
0.111 0.111 0.788 0.101 0.800 0.099 0.500 0.255 0.245
0.234 0.675 0.091 0.100 0.088 0.812 0 0 1
$ tr -s ' \t' '\n\n' < data | awk '$0>max+0 {max=$0} !(NR%3) {print max; max=0}'
0.788
0.800
0.500
0.675
0.812
1

$ cat file
0.111 0.111 0.788 0.101 0.800 0.099 0.500 0.255 0.245 
0.234 0.675 0.091 0.100 0.088 0.812 0 0 1 7