CODEWITHSUNDEEP
linuxawk
Victor S
Victor S

Reputation: 4191

Why awk print in two lines?

$ cat ff
./res/values/strings.xml:1293:    <string name="sub1LineNumber">Sub1 Number :</string>
./res/values/strings.xml:1302:    <string name="xdivert_partial_set">XDivert has been set only for 1st subscription</string>
./res/values/strings.xml:1870:    <string name="set_sub_1">Subscription 1: </string>
./res/values/strings.xml:1860:    <string name="sub_1">SUB 1</string>

for f in $(cat ff |awk -F : '{print $1" +" $2}'); do echo $f; done
./res/values/strings.xml
+1293
./res/values/strings.xml
+1302
./res/values/strings.xml
+1870
./res/values/strings.xml
+1860

I want to print $1 and $2 in format $1 +$2 in one line, but it print above, what's wrong?

Upvotes: 0

Views: 1341

Answers (3)

Dan
Dan

Reputation: 4502

The delimeter for for is any space, so the space in the awk output will be treated as a separate value.

Instead of a for loop, you can read lines of output at a time with the while read construct. For example,

awk -F : '{print $1 " +" $2}' ff | while read f; do
  echo "$f"
done

Upvotes: 1

Jonathan Leffler
Jonathan Leffler

Reputation: 753765

awk doesn't print two lines; your echo prints the two lines because there's a space between the file name and the line number so the for loop sees the file name as one value for f and then the line number as a second value, and so on.

You also don't need to use cat; awk can read files too.

For the shown loop body, you can write:

awk '{print $1 " +" $2}' ff

For a more general loop body, you're best off avoiding the space:

for f in $(awk '{print $1 "+" $2 }' ff)
do
    ...whatever...
done

Upvotes: 1

danfuzz
danfuzz

Reputation: 4353

You don't need the for wrapper around the awk command.

If you just run the awk command, you'll get the output you want:

$ cat ff | awk -F : '{print $1 " +" $2}'
./res/values/strings.xml +1293
./res/values/strings.xml +1302
./res/values/strings.xml +1870
./res/values/strings.xml +1860

What's happening is that the $(...) wrapper and the for loop are causing each space-separated word in your awk output to become a separate input to the loop. Remove the loop, and remove the problem.

Upvotes: 7

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