SHELL

awk for loop

cat file.txt | awk '{ for(i=1; i<=8 ; i++) print $i}'

file.txt :
AAA BBB CCC DDD

output : 
AAA
BBB
CCC
DDD

awk for loop

{ for (i=1;i<=8;i++) {print $i} }
# Examples 

# Print first 8 fields of each line of text file
awk '{ for (i=1;i<=8;i++) {printf $i" "} }' /path/to/text/file

# Print first 8 fields of each line of text file in reverse order
awk '{ for (i=8;i<=1;i--) {printf $i" "} }' /path/to/text/file

# Print all but the last two fields of each line of text file
awk '{ for (i=1;i<=(NF-2);i++) {printf $i" "} }' /path/to/text/file