bugfindutils - Bugs: bug #50835, -print0 causes all files to be...


bug #50835: -print0 causes all files to be output

Submitter:  George Gonzalez <ggonzalez>
Submitted:  Thu 20 Apr 2017 03:40:47 PM UTC
Category:  find Severity:  3 - Normal
Item Group:  None Status:  Duplicate
Privacy:  Public Assigned to:  None
Originator Name:  ggonzalez Open/Closed:  Closed
Release:  4.5.11 Fixed Release:  None
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Thu 20 Apr 2017 06:19:49 PM UTC, comment #1: 

Your complaint is the same as in bug 50780. Quoting from my response there, with a tweak of -printf changed to -print0:

When two expressions are written as 'A B', find behaves if you had instead written 'A -a B'. The -a operator is short-circuiting: if expression A returns false, expression B is not attempted; but if expression A returns true, then expression B is used.

When you write -print0 first, it always executes (everything gets printed), then you filter out the files, but do nothing further with the files you filtered.

When you write -print0 second, it only executes on the files that got past the -type filter.

Eric Blake <ericb>
Group administrator
Thu 20 Apr 2017 03:40:47 PM UTC, original submission:  

We run these commands:

find "$Here"   -perm /u=x,g=x,o=x   -type f   >/tmp/allbins

find "$Here"   -perm /u=x,g=x,o=x   -type f -ls   >/tmp/allbins-ls

find "$Here"  -print0    -perm /u=x,g=x,o=x   -type f   >/tmp/allbins-z

wc -l /tmp/allbins

wc -l /tmp/allbins-ls

cat /tmp/allbins-z | tr '\0' '\n' | wc -l

The output is:

$ sudo bash t.sh
101 /tmp/allbins
101 /tmp/allbins-ls

.... So it looks like there are 3779 files listed when we ask for -print0.
A quiick perusal using :  cat /tmp/allbins-z | tr '\0' '\n'   shows:


.. all of which are not type f or mode executable

This sure looks like a bug!



George Gonzalez <ggonzalez>


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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2017-04-20 ericb Item GroupWrong result None
        StatusNone Duplicate
        Open/ClosedOpen Closed

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