lchgrp

  • This function’s solution assumes a Unix-like operating system.

    The lchgrp function in PHP will change the group of a file to a different group ID, assuming the PHP process has sufficient privileges to do so. It is the same as PHP’s chgrp, but it does not follow the last symbolic link. Instead, it changes the link itself.

    PHP

    lchgrp('/path/to/foobar', 501);

    Ruby’s File.lchown class method is used to accomplish the same task.

    Ruby

    File.lchown(nil, 501, '/path/to/foobar')

    The first argument of File.lchown is the user, the second is the group, and the third is the file. Above, the user is set to nil. This will leave the user unchanged.

    Changing the Group by Name

    One nice feature of PHP’s lchgrp is that the $group argument is mixed. It can accept either a group ID or a group name.

    PHP

    lchown('/path/to/foobar', 'herbert');

    File.lchown from Ruby is not as flexible. It only accepts numeric IDs. To change the group by name, we must first perform a lookup to get the group ID from the name.

    The Etc module from the Ruby Standard Library contains a method getgrnam that returns a Struct of information about a group by name, which includes the group ID. We can use this lookup the group ID and then pass it to File.lchown.

    Ruby

    require 'etc'
 
gid = Etc.getgrnam('herbert').gid
File.lchown(nil, gid, '/path/to/foobar')

    see also

← key lchown →

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