Singular Manual: link related functions

| ### 4.10.3 link related functions `close` closes a link (see close) `dump` generates a dump of all variables and their values (see dump) `getdump` reads a dump (see getdump) `open` opens a link (see open) `read` reads from a link (see read) `status` gets the status of a link (see status) `write` writes to a link (see write) `kill` closes and kills a link (see kill) `waitall` wait till all links of a list of links become ready (only ssi:tcp links) (see waitall) `waitfirst` wait till at least one link of a list of links become ready (only ssi:tcp links) (see waitfirst)

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