Shell Programming and Scripting

cat $file | while read line; do
...
done

cat $line | while read line; do  ## Reads each line
   grup=`echo "$line" | cut -d " " -f3`;  ## Takes third column
   if [ "$grup" == "27" ]; then  // ## If column == "27" prints column 2. 
      exp=`echo "$line"  | cut -d " " -f2`; 
      echo $exp; 
   fi; 
done;

awk '$3==27{print $2}' file

$ time echo "hello"
hello
real    0m0.000s
user    0m0.000s
sys     0m0.000s

 
$time ./myscript.sh

cat $line | while read first second third rest; do  ## Reads each line into separate variables
   if [ "$third" == "27" ]; then  // ## If column == "27" prints column 2. 
        echo $second; 
   fi; 
done;

while read first second third rest; do  ## Reads each line into separate variables
   if [ "$third" == "27" ]; then  // ## If column == "27" prints column 2. 
        echo $second; 
   fi; 
done < $line