Linux and UNIX Man Pages

Test Your Knowledge in Computers #546
Difficulty: Medium
In computer science, an operator takes the values of its operands and combines them in some way to produce a new value.
True or False?
Linux & Unix Commands - Search Man Pages

dpkg::control::fields(3) [linux man page]

Dpkg::Control::Fields(3)					   libdpkg-perl 					  Dpkg::Control::Fields(3)

Dpkg::Control::Fields - manage (list of official) control fields DESCRIPTION
The modules contains a list of fieldnames with associated meta-data explaining in which type of control information they are allowed. The types are the CTRL_* constants exported by Dpkg::Control. FUNCTIONS
my $f = field_capitalize($field_name) Returns the field name properly capitalized. All characters are lowercase, except the first of each word (words are separated by a dash in field names). field_is_official($fname) Returns true if the field is official and known. field_is_allowed_in($fname, @types) Returns true (1) if the field $fname is allowed in all the types listed in the list. Note that you can use type sets instead of individual types (ex: CTRL_FILE_CHANGES | CTRL_CHANGELOG). field_allowed_in(A|B, C) returns true only if the field is allowed in C and either A or B. Undef is returned for non-official fields. field_transfer_single($from, $to, $field) If appropriate, copy the value of the field named $field taken from the $from Dpkg::Control object to the $to Dpkg::Control object. Official fields are copied only if the field is allowed in both types of objects. Custom fields are treated in a specific manner. When the target is not among CTRL_PKG_SRC, CTRL_PKG_DEB or CTRL_FILE_CHANGES, then they are alway copied as is (the X- prefix is kept). Otherwise they are not copied except if the target object matches the target destination encoded in the field name. The initial X denoting custom fields can be followed by one or more letters among "S" (Source: corresponds to CTRL_PKG_SRC), "B" (Binary: corresponds to CTRL_PKG_DEB) or "C" (Changes: corresponds to CTRL_FILE_CHANGES). Returns undef if nothing has been copied or the name of the new field added to $to otherwise. field_transfer_all($from, $to) Transfer all appropriate fields from $from to $to. Calls field_transfer_single() on all fields available in $from. Returns the list of fields that have been added to $to. field_ordered_list($type) Returns an ordered list of fields for a given type of control information. This list can be used to output the fields in a predictable order. The list might be empty for types where the order does not matter much. field_list_src_dep() List of fields that contains dependencies-like information in a source Debian package. field_list_pkg_dep() List of fields that contains dependencies-like information in a binary Debian package. The fields that express real dependencies are sorted from the stronger to the weaker. field_get_dep_type($field) Return the type of the dependency expressed by the given field. Can either be "normal" for a real dependency field (Pre-Depends, Depends, ...) or "union" for other relation fields sharing the same syntax (Conflicts, Breaks, ...). Returns undef for fields which are not dependencies. field_register($field, $allowed_types, %opts) Register a new field as being allowed in control information of specified types. %opts is optional field_insert_after($type, $ref, @fields) Place field after another one ($ref) in output of control information of type $type. field_insert_before($type, $ref, @fields) Place field before another one ($ref) in output of control information of type $type. AUTHOR
Raphael Hertzog <>. 2012-04-17 Dpkg::Control::Fields(3)

Featured Tech Videos