gawk: Getline/Variable/Coprocess

1 
1 4.10.8 Using 'getline' into a Variable from a Coprocess
1 -------------------------------------------------------
1 
1 When you use 'COMMAND |& getline VAR', the output from the coprocess
1 COMMAND is sent through a two-way pipe to 'getline' and into the
1 variable VAR.
1 
1    In this version of 'getline', none of the predefined variables are
1 changed and the record is not split into fields.  The only variable
1 changed is VAR.  However, 'RT' is set.
1 
1    Coprocesses are an advanced feature.  They are discussed here only
1 because this is the minor node on 'getline'.  ⇒Two-way I/O, where
1 coprocesses are discussed in more detail.
1