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Full Discussion: mkdir limitations
Top Forums UNIX for Dummies Questions & Answers mkdir limitations Post 26918 by Perderabo on Monday 26th of August 2002 08:20:52 AM
Old 08-26-2002
I did a "man mkdir" and I didn't find an answer to these questions.

The mkdir() system call code in the kernel does not directly impose a limit on the length of a filename. However it must talk to the code for filesystem and this will impose a limit. What that limit is depends on the file system. Posix will guarantee at least 14 characters. To be posix compliant, a unix system must allow at least that much. HP-UX still supports the "short filename" option. If you choose, you can make HP-UX enforce a 14 character limit. This is rarely done. The most common limit these days is 255 characters for a filename. And the most common limit for a full path name is 1023.

You probably will find that you have a pathconf() system call that can determine your exact limit. Note that you must give pathconf() a file name because the limits can vary from filesystem to filesystem.

Because a slash is used to separate the components of a pathname, a slash cannot be used inside a component. And binary zero is used to terminate a string. So no binary zeros either. Any other byte value is fair game as far as the kernel is concerned. A filename with an embedded carriage return will cause you nasty problems. And you really will be better off if you limit yourself to printable characters.
 

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MKDIR(1)							   User Commands							  MKDIR(1)

NAME
mkdir - make directories SYNOPSIS
mkdir [OPTION]... DIRECTORY... DESCRIPTION
Create the DIRECTORY(ies), if they do not already exist. Mandatory arguments to long options are mandatory for short options too. -m, --mode=MODE set file mode (as in chmod), not a=rwx - umask -p, --parents no error if existing, make parent directories as needed -v, --verbose print a message for each created directory -Z, --context=CTX set the SELinux security context of each created directory to CTX --help display this help and exit --version output version information and exit AUTHOR
Written by David MacKenzie. REPORTING BUGS
Report mkdir bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> COPYRIGHT
Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
mkdir(2) The full documentation for mkdir is maintained as a Texinfo manual. If the info and mkdir programs are properly installed at your site, the command info coreutils 'mkdir invocation' should give you access to the complete manual. GNU coreutils 7.1 July 2010 MKDIR(1)
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