G'day propellerhat,
Welcome to the Monastery.
I created some directories and populated them with files having varying contents and permissions:
$ for i in a b c; do cd $i; echo "DIR: `pwd`"; ls -l; cd ..; done DIR: /home/ken/tmp/pm_11135362/a total 1 -rw-r--r-- 1 ken None 0 Jul 25 16:44 empty ---------- 1 ken None 18 Jul 25 16:45 no_access DIR: /home/ken/tmp/pm_11135362/b total 1 -r--r--r-- 1 ken None 20 Jul 25 16:49 read_only DIR: /home/ken/tmp/pm_11135362/c total 1 -rw-r--r-- 1 ken None 7 Jul 25 16:51 read_write
I then wrote the following script which does various checks. The else blocks (with "OK to READ/WRITE") are where you'd call your reading/writing routines.
#!/usr/bin/env perl use strict; use warnings; use Cwd; use File::Find; my $cwd = getcwd(); my @dirs = map "$cwd/$_", qw{a b c}; print "--- READING ---\n"; find(\&wanted_to_read, @dirs); print "--- WRITING ---\n"; find(\&wanted_to_write, @dirs); sub wanted_to_read { if (! -f $File::Find::name) { print "$File::Find::name is not a normal file.\n"; } elsif (-z _) { print "$File::Find::name is zero-length.\n"; } elsif (! -r _) { print "$File::Find::name is not readable.\n"; } else { print "OK to READ: $File::Find::name\n"; } return; } sub wanted_to_write { if (! -f $File::Find::name) { print "$File::Find::name is not a normal file.\n"; } elsif (! -r _) { print "$File::Find::name is not readable.\n"; } elsif (! -w _) { print "$File::Find::name is not writable.\n"; } else { print "OK to WRITE: $File::Find::name\n"; } return; }
A sample run outputs:
ken@titan ~/tmp/pm_11135362 $ ./pm_11135362_file_find_example.pl --- READING --- /home/ken/tmp/pm_11135362/a is not a normal file. /home/ken/tmp/pm_11135362/a/empty is zero-length. /home/ken/tmp/pm_11135362/a/no_access is not readable. /home/ken/tmp/pm_11135362/b is not a normal file. OK to READ: /home/ken/tmp/pm_11135362/b/read_only /home/ken/tmp/pm_11135362/c is not a normal file. OK to READ: /home/ken/tmp/pm_11135362/c/read_write --- WRITING --- /home/ken/tmp/pm_11135362/a is not a normal file. OK to WRITE: /home/ken/tmp/pm_11135362/a/empty /home/ken/tmp/pm_11135362/a/no_access is not readable. /home/ken/tmp/pm_11135362/b is not a normal file. /home/ken/tmp/pm_11135362/b/read_only is not writable. /home/ken/tmp/pm_11135362/c is not a normal file. OK to WRITE: /home/ken/tmp/pm_11135362/c/read_write
I don't know what your reading/writing requirements are. See the open function, in the first instance, if you're unsure about that. Feel free to ask further questions about that if need be.
I also don't know what you mean by "IF check". It's not mentioned in the File::Find documentation. By itself, "IF" has a number of potentially valid interpretations in the context of your question (for instance, in "What does IF stand for?"); and you give no indication of what you intend to check. I've used a number of "file tests" which is possibly the sort of thing you want. [See "How do I post a question effectively?" for information on how you can help us to help you.]
Be very careful with specifying directories when using File::Find. I used Cwd for my example code, but that would have various problems in a production environment. The FindBin module may be useful if your target directories are always located relative to your script. Better options are to get the directories from a known source; e.g. a database, config file, or the like.
— Ken
In reply to Re: file modifications using file::find
by kcott
in thread file modifications using file::find
by propellerhat
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