Can the Unix list command 'ls' output numerical chmod permissions? - Stack Overflow
Perl-Commons/common.pm at master · BrightcoveOS/Perl-Commons · GitHub
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To read Linux file permissions you need more than ls -l
GitHub - ibilux/understanding-file-mode
Stat-lsMode/lsMode.pm at master · gitpan/Stat-lsMode · GitHub
The stat and lstat Functions - Learning Perl, Fourth Edition [Book]
Stat command in Linux with examples - GeeksforGeeks
stat (system call) - Wikipedia
about-perl/stat.pl at master · ReneNyffenegger/about-perl · GitHub
Perl - manmrk.net | Manualzz
PERL Programming Exercise Guide
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What are your tips on understanding what permissions a file or directory has? (For example, 644, 755, drwxr-xr-x, etc) - Quora
ITEC400 Week Seven Instructor Professor D'Andrea. - ppt download