CODEWITHSUNDEEP
awk
NeronLeVelu
NeronLeVelu

Reputation: 10039

display and/or use awk FILENAME on empty files

Is there a way to print filename of "empty" file in a awk.

trying to reply to another awk question that need peer of file (1 file + same filename + extension) i create several file with touch (so empty one). Let's say:

file1.raw
file1.raw.ext
file2.raw
file2.raw.ext

I than use the code

awk 'FNR==1{print FILENAME;print FILENAME".ext"};#some other action on line' file*.raw

result is empty (right, FNR is never 1). how can a print files name when they are treated ? is there a FNR==0 or BEGINF ? I can use argument list and compare but this will be treated asynchronously (BEGIN or END of FNR==1 of a file having at least 1 line)

expected result
file1.raw
(some action result here if file1.raw was not empty)
file1.raw.ext
file2.raw
(some action result here if file2.raw was not empty)
file2.raw.ext

Upvotes: 1

Views: 219

Answers (1)

Ed Morton
Ed Morton

Reputation: 203324

idk why some moderator (@ChrisF) deleted this first time around but this IS the correct answer to this question so let's try again and if that person has a question or comment then perhaps they can post it like a reasonable person would instead of erroneously deleting the correct answer:

with GNU awk:

awk 'BEGINFILE{print FILENAME}1' *

with other awks (untested):

awk '
FNR==1 {
    for (++ARGIND;ARGV[ARGIND]!=FILENAME;ARGIND++) {
        print ARGV[ARGIND]
    }
    print FILENAME
}
{ print }
END {
    for (++ARGIND;ARGIND in ARGV;ARGIND++) {
        print ARGV[ARGIND]
    }
}' *

Upvotes: 1

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