Getline Summary (The GNU Awk User’s Guide)

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4.10.10 Summary of getline Variants

Table 4.1 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
getline Sets $0, NF, FNR, NR, and RT awk
getline var Sets var, FNR, NR, and RT awk
getline < file Sets $0, NF, and RT awk
getline var < file Sets var and RT awk
getline Sets $0, NF, and RT awk
getline var Sets var and RT awk
& getline Sets $0, NF, and RT gawk
& getline var Sets var and RT gawk

Table 4.1: getline variants and what they set