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How does the following code print just a single file?

find "$fdir" -type f -name "${fnam}-*.png" -print0 | awk -v RS='\0' -F'[-.]' '{print $(NF-1), $0}' | cat -vet

which gives me

04 /home/flora/edvart/docs/schimmel-04.png$

But doing find "$fdir" -type f -name "${fnam}-*.png" gives

/home/flora/edvart/docs/schimmel-04.png
/home/flora/edvart/docs/schimmel-05.png
/home/flora/edvart/docs/schimmel-06.png
/home/flora/edvart/docs/schimmel-07.png
/home/flora/edvart/docs/schimmel-08.png
/home/flora/edvart/docs/schimmel-09.png
/home/flora/edvart/docs/schimmel-10.png
/home/flora/edvart/docs/schimmel-11.png
/home/flora/edvart/docs/schimmel-12.png
/home/flora/edvart/docs/schimmel-13.png
/home/flora/edvart/docs/schimmel-1.png
/home/flora/edvart/docs/schimmel-2.png
/home/flora/edvart/docs/schimmel-3.png
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9
  • What are the contents inside $fdir? and what is the value of $fnam? Commented Oct 18, 2021 at 5:39
  • 1
    For me works as expected (each file one record / line). Commented Oct 18, 2021 at 5:46
  • fdir: /home/flora/edvart/docs and fnam: schimmel Commented Oct 18, 2021 at 5:50
  • 2
    Is your (unknown) awk able to use \0 as a record separator with the meaning you intend for it? Commented Oct 18, 2021 at 6:05
  • I guess printf 'a\0b\0' | awk -v RS='\0' 1 may tell us something about your awk. Does it print two lines? or just a? Commented Oct 18, 2021 at 6:09

1 Answer 1

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Only GNU awk and mawk (release 1.3.4 or later) can use \0 as a record separator with the meaning "null character." Older releases of mawk, BSD awk, Busybox awk, Plan 9 awk etc. all treat the string \0 in RS as if RS had been the empty string, i.e., it enables "paragraph mode" (two or more contiguous newlines delimit records).

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