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Full Discussion: command difference - find
Top Forums UNIX for Dummies Questions & Answers command difference - find Post 302598571 by agama on Tuesday 14th of February 2012 11:41:44 PM
Old 02-15-2012
Quote:
Originally Posted by lamont
Hi,

What is the difference between these two?

Code:
find /some_dir -type f -exec chmod 070 {} \;

The command above will execute one chmod command for every file it finds. In theory less efficient because of the overhead of starting a new process for each file.

Quote:

Code:
chmod 070 `find /some_dir -type f`

The second command invokes one chmod process to set the permissions on all of the files that are discovered by find. The biggest potential problem with this command is that the number of files found could cause the command argument limit to be exceeded. If you are wanting to minimise the number of chmod processes that are started, this would be the best method:

Code:
find /path -type f | xargs chmod 0755

The xargs command will invoke chmod with the output from find, ensuring that the maximum argument limit isn't exceeded. If it has to, it will invoke chmod more than once, but you won't have a 1:1 ratio of chmod processes to files found.
 

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CHMOD(3)								 1								  CHMOD(3)

chmod - Changes file mode

SYNOPSIS
bool chmod (string $filename, int $mode) DESCRIPTION
Attempts to change the mode of the specified file to that given in $mode. PARAMETERS
o $filename - Path to the file. o $mode - Note that $mode is not automatically assumed to be an octal value, so to ensure the expected operation, you need to prefix $mode with a zero (0). Strings such as "g+w" will not work properly. <?php chmod("/somedir/somefile", 755); // decimal; probably incorrect chmod("/somedir/somefile", "u+rwx,go+rx"); // string; incorrect chmod("/somedir/somefile", 0755); // octal; correct value of mode ?> man 1 chmod' and ' man 2 chmod'. <?php // Read and write for owner, nothing for everybody else chmod("/somedir/somefile", 0600); // Read and write for owner, read for everybody else chmod("/somedir/somefile", 0644); // Everything for owner, read and execute for others chmod("/somedir/somefile", 0755); // Everything for owner, read and execute for owner's group chmod("/somedir/somefile", 0750); ?> RETURN VALUES
Returns TRUE on success or FALSE on failure. NOTES
Note The current user is the user under which PHP runs. It is probably not the same user you use for normal shell or FTP access. The mode can be changed only by user who owns the file on most systems. Note This function will not work on remote files as the file to be examined must be accessible via the server's filesystem. Note When safe mode is enabled, PHP checks whether the files or directories you are about to operate on have the same UID (owner) as the script that is being executed. In addition, you cannot set the SUID, SGID and sticky bits. SEE ALSO
chown(3), chgrp(3), fileperms(3), stat(3). PHP Documentation Group CHMOD(3)
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