tag(3)

NAME

tag - Manipulate tagged files

tag option ?arg arg ...?

The tag procedure provides a number of options for manipulating tagged files.

tag readfile filename: Reads the file with the given filename and returns a list where each list element is a tag record, which is represented by a list of label-value pairs, or label-value-endlabel triples.; The tag header is the first element returned.
tag writefile filename list: Takes a list in the format used internally in tcl programs for tagged data and writes it as a tagged file.
tag extract list tests: Takes a list in tagged format, and a list of conditions, and returns a new list in tagged format which contains those tag records which match the conditions.; The tests is a list of test items, each of which is a list of the form { labelname condition matchvalue }; The conditions are
== String equals
!= String not equal
<= Less than or equal
-in Is the test value a member of the list given as the matchvalue
-contains: Does the match value contain the test value as a case insensitive substring.
-earlier: Date earlier
-later Date later - dates are in ISO format (yyyy-mm-dd [hh:mm:ss]).
-exists: Does the label exist in this record.

tag readfile reads the whole file into memory before turning it into a list. Should be more memory efficient.

The -earlier and -later comparisons require TCL8.3