Shell Programming and Scripting

cat testfile

a b 3 4.py 5 6
a b.py c.py 4 5 6 7 8
1.py 2.py 3 4 5 6

4.py
b.py c.py
1.py 2.py

awk '{for(i=1;i<=NF;i++){if($i ~ /.py/){printf("%s ",$i)}};print ""}'   Input_file

{printf("%s ",$i)}};print ""}

awk '{
for(i=1;i<=NF;i++){                ##### Starting a for loop here which will start from variable i's value 1 to till number of field's value(NF).
if($i ~ /.py/){                    ##### Checking a condition here if any field's value is equal to .py, if yes then perform following action.
printf("%s ",$i)}                  ##### printing the value of that field which is having .py in it with space. NO new line.(so that all .py values on a single line I could print on a single line only)
};
print ""}                          ##### Printing NULL value, which means it will print a new line.
'  Input_file                      ##### mentioning the Input_file here.