Singular Manual: status

  | ### 5.1.148 status `Syntax:` `status (` link_expression`,` string_expression `)` `Type:` string `Syntax:` `status (` link_expression`,` string_expression`,` string_expression `)` `Type:` int `Purpose:` returns the status of the link as asked for by the second argument. If a third argument is given, the result of the comparison to the status string is returned: `(status(l,s1)==s2)` is equivalent to `status(l,s1,s2)`. The following string expressions are allowed: ``"name"`` the name string given by the definition of the link (usually the filename) ``"type"`` returns `"ASCII"`, `"DBM"` or `"ssi"` ``"open"`` returns `"yes"` or `"no"` ``"openread"`` returns `"yes"` or `"no"` ``"openwrite"`` returns `"yes"` or `"no"` ``"read"`` returns `"ready"` or `"not ready"` ``"write"`` returns `"ready"` or `"not ready"` ``"mode"`` returns (depending on the type of the link and its status) `"","w","a","r"` or `"rw"` ``"exists"`` returns `"yes"` or `"no"`: existence of the filename for ASCII/ssi links `Syntax:` `status (` list_expression`,` int_expression `)` `Type:` int `Purpose:` the list should be a list L of links, the second argument a timeout in 1/10 seconds. Returns ``-2`` select returns an error ``-1`` all links are closed/at eof ``0`` timeout ``>0`` (at least) L[i] is ready `Example:`
        link l=":w example.txt";
        status(l,"write");
      ==> not ready
        open(l);
        status(l,"write","ready");
      ==> 1
        close(l);
See link; open; read; write.

User manual for Singular version 4-2-0p1, 2020, generated by texi2html.