for

Probably work with GNU Awk 4.1.4, API: 1.1 (GNU MPFR 3.1.5, GNU MP 6.1.2)

awk 'BEGIN { print sqrt(18/3) }'
echo "0.4 0.7" | awk '{printf "%2.2f\n", $1 * $2}'

Find linenumber

awk '/string/{ print NR; exit }' file.txt
awk 'match($0,v){print NR; exit}' v=string file.txt # With a variable

Replace characters
Built-in Variables: FS, OFS, RS, ORS, NF, NR, FNR, FILENAME

awk '{print $3,$2,$1}' RS="\n\n" FS="\n" OFS=";" somefile.txt

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