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$ for i in a b c; do cd $i; echo "DIR: `pwd`"; ls -l; cd ..; done
DIR: /home/ken/tmp/pm_11135362/a
...
DIR: /home/ken/tmp/pm_11135362/c
total 1
-rw-r--r-- 1 ken None 7 Jul 25 16:51 read_write

#!/usr/bin/env perl

...

    return;
}

ken@titan ~/tmp/pm_11135362
$ ./pm_11135362_file_find_example.pl
...
/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