$(@D)/pigz -kf pigz.c ; $(@D)/pigz -t pigz.c.gz
$(@D)/pigz -kfb 32 pigz.c ; $(@D)/pigz -t pigz.c.gz
$(@D)/pigz -kfp 1 pigz.c ; $(@D)/pigz -t pigz.c.gz
$(@D)/pigz -kfz pigz.c ; $(@D)/pigz -t pigz.c.zz
$(@D)/pigz -kfK pigz.c ; $(@D)/pigz -t pigz.c.zip
printf "" | $(@D)/pigz -cdf | wc -c | test `cat` -eq 0
printf "x" | $(@D)/pigz -cdf | wc -c | test `cat` -eq 1
printf "xy" | $(@D)/pigz -cdf | wc -c | test `cat` -eq 2
printf "xyz" | $(@D)/pigz -cdf | wc -c | test `cat` -eq 3
(printf "w" | gzip ; printf "x") | $(@D)/pigz -cdf | wc -c | test `cat` -eq 2
(printf "w" | gzip ; printf "xy") | $(@D)/pigz -cdf | wc -c | test `cat` -eq 3
(printf "w" | gzip ; printf "xyz") | $(@D)/pigz -cdf | wc -c | test `cat` -eq 4
compress -f < pigz.c | $(@D)/unpigz | cmp - pigz.c
(mkdir -p d/1; cd d/1; tar xzf ../../../../pigz-2.3.3.tar.gz; \
  cd ..; cp -pr 1 2; $(@D)/pigz -rp 4 --index %z 1; \
  $(@D)/pigz -drp 4 --index %z 1; diff -r 1 2)
Common subdirectories: 1/pigz-2.3.3 and 2/pigz-2.3.3
Common subdirectories: 1/pigz-2.3.3/zopfli and 2/pigz-2.3.3/zopfli
Common subdirectories: 1/pigz-2.3.3/zopfli/src and 2/pigz-2.3.3/zopfli/src
Common subdirectories: 1/pigz-2.3.3/zopfli/src/zopfli and 2/pigz-2.3.3/zopfli/src/zopfli
(mkdir -p d/1; cd d/1; tar xzf ../../../../pigz-2.3.3.tar.gz; \
  cd ..; cp -pr 1 2; $(@D)/pigz -zrp 4 -X %f.idx 1; \
  $(@D)/pigz -dzrp 4 -X %f.idx 1; diff -r 1 2)
Common subdirectories: 1/pigz-2.3.3 and 2/pigz-2.3.3
Common subdirectories: 1/pigz-2.3.3/zopfli and 2/pigz-2.3.3/zopfli
Common subdirectories: 1/pigz-2.3.3/zopfli/src and 2/pigz-2.3.3/zopfli/src
Common subdirectories: 1/pigz-2.3.3/zopfli/src/zopfli and 2/pigz-2.3.3/zopfli/src/zopfli