Search notes:
awk examples
number of record of current file ($FNR)
output field separator ($OFS)
awk example: print range
current filename ($FILENAME)
record seperator ($RS)
output record seperator ($ORS)
number of record ($NR)
skip-first-n-lines
number of fields in record ($NF)
field-seperator ($F)
calculate total file size (sum) in a directory
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