gawk: Getline Summary
4.10.10 Summary of 'getline' Variants
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Table 4.1 table-getline-variants. summarizes the eight variants
of 'getline', listing which predefined variables are set by each one,
and whether the variant is standard or a 'gawk' extension. Note: for
each variant, 'gawk' sets the 'RT' predefined variable.
Variant Effect 'awk' / 'gawk'
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'getline' Sets '$0', 'NF', 'FNR', 'awk'
'NR', and 'RT'
'getline' VAR Sets VAR, 'FNR', 'NR', 'awk'
and 'RT'
'getline <' FILE Sets '$0', 'NF', and 'RT' 'awk'
'getline VAR < FILE' Sets VAR and 'RT' 'awk'
COMMAND '| getline' Sets '$0', 'NF', and 'RT' 'awk'
COMMAND '| getline' Sets VAR and 'RT' 'awk'
VAR
COMMAND '|& getline' Sets '$0', 'NF', and 'RT' 'gawk'
COMMAND '|& getline' Sets VAR and 'RT' 'gawk'
VAR
Table 4.1: 'getline' variants and what they set