Listing directory content of a directory with a lot of entries

perl -le 'opendir DIR, "." or die; print while $_ = readdir DIR; closedir DIR'
Ever wanted to get the directory content with 'ls' or 'find' and had to wait minutes until something was printed? Perl to the rescue. The one-liner above(redirected to a file) took less than five seconds to run in a directory with more man 2 million files. One can adapt it to e.g. delete files that match a certain pattern.
Sample Output
1-36-AP10_.001
1-36-AP10_.001.AR14
1-36-AP10_.001.AR14P
1-36-AP10_.001.R14___
1-36-AP10_.001.mbcsf
1-36-AP10_.A000.R14___
1-36-AP10_.A000.TS
1-36-AP10_.A000.u
1-36-AP10_.A000.ugm
1-36-AP10_.A000.vgm
1-36-AP10_.A001.R14___
1-36-AP10_.A001.TS
1-36-AP10_.A001.u
1-36-AP10_.A001.ugm
1-36-AP10_.A001.vgm
1-36-AP10_.AR14
1-36-AP10_.AR14A
1-36-AP10_.AR14P
1-36-AP10_.CONV.001
1-36-AP10_.CONVSHUF.001
1-36-AP10_.Freshwater
...
(over 2'000'000 lines omitted)

1
By: bierik
2011-04-04 06:21:39

What Others Think

find
bashrc · 617 weeks and 3 days ago
What options to use with find? I tried it in the same directory and it took almost two minutes. The perl solution took less than five seconds.
bierik · 617 weeks and 2 days ago
Are you voting this command down because you personally don't like it? Or is it because it does not work? Because it worked fine for me, and it took seconds to complete.
SuperFly · 617 weeks and 2 days ago
The problem has to do with buffering, I think. Perl handles this differently than `ls`, but that's probably because Perl adds another layer of buffering. If that's indeed the case, `find` may not solve this issue. Anyone who actually knows what they're talking about?
kaedenn · 617 weeks and 2 days ago
Looking at the straces of perl and find, I see that find calls newfstatat for every single file it finds, blowing up the strace output file to about 200MB. Perl doesn't call newfstatat at all and its strace file is less than one MB. Why is this system call made? Can one suppress it?
bierik · 617 weeks and 2 days ago
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rahimhh21 · 22 weeks and 4 days ago
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Perfecthomepugs · 13 weeks and 3 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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