awk used in for loop

abe6162 · #1 (**permalink**) 02-24-04, 09:11

I doing a for loop using awk as in below ..

for x in `awk '{print $1$2}'`

done

is there any why to see the what is in the second field inside the for loop. for example ( I tried this but it didnt' work) ..

for x in `awk '{print $1$2}'`

awk 'print{$2}' $x

done

aigles · #2 (**permalink**) 02-24-04, 09:27

If you doesn't specify a file, 'awk' read stdin, are you sure that is what you want to do ?

abe6162 · #3 (**permalink**) 02-24-04, 09:29

Sorry. I did include a file for awk to read in. for example...

for x in `awk '{print$1$2}' tst `

awk '{print$2}' $x

done

Quote:

Originally posted by aigles
If you doesn't specify a file, 'awk' read stdin, are you sure that is what you want to do ?

aigles · #4 (**permalink**) 02-24-04, 09:48

awk '{print$2}' $x

In this statement, awk try to print the second field of every lines of the file $x.
If you want that awk works on the contents of the variable, tou must write :

echo $x | awk '{print $2}'

In fact the result will be empty and not the field2 of the original file, since you concatenate fields 1 and 2.

If tst contains 'aaaa bbbb ccc'
x will contains "aaaabbbb" which is single field.

What do you want to do exactly ?
If you need fields 1 and 2, you can do :

Code:

while read field1 field2 other_fields
do
   echo "Field 1: $field1"
   echo "Field 2: $field2"
donei < tst

abe6162 · #5 (**permalink**) 02-24-04, 10:08

Thanks that worked!!!

Quote:

Originally posted by aigles
awk '{print$2}' $x

In this statement, awk try to print the second field of every lines of the file $x.
If you want that awk works on the contents of the variable, tou must write :

echo $x | awk '{print $2}'

In fact the result will be empty and not the field2 of the original file, since you concatenate fields 1 and 2.

If tst contains 'aaaa bbbb ccc'
x will contains "aaaabbbb" which is single field.

What do you want to do exactly ?
If you need fields 1 and 2, you can do :

Code:

while read field1 field2 other_fields
do
   echo "Field 1: $field1"
   echo "Field 2: $field2"
donei < tst

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