awk [POSIX or GNU style options] -f progfile [--] file … awk [POSIX or GNU style options] [--] 'program' file …
-f progfile | --file=progfile | |
-F fs | --field-separator=fs | |
-v var=val | --assign=var=val |
-b | --characters-as-bytes | ||
-c | --traditional | ||
-C | --copyright | ||
-d | --dump-variables | [file] | |
-D | --debug | [file] | |
-e | --source= | 'program-text' | |
-E | --exec= | file | |
-g | --gen-pot | ||
-h | --help | ||
-i | --include= | includefile | |
-l | --load= | library | |
-L | --lint[=] | [fatal|invalid|no-ext] | |
-M | --bignum | ||
-N | --use-lc-numeric | ||
-n | --non-decimal-data | ||
-o | --pretty-print[=] | [file] | |
-O | --optimize | ||
-p | --profile[=] | [file] | |
-P | --posix | ||
-r | --re-interval | ||
-s | --no-optimize | ||
-S | --sandbox | ||
-t | --lint-old | ||
-V | --version | ||
-W | -W followed by the name of a long option, is used in gawk for POSIX compatiblity. |
NR | The cumulative processed record number, starting with 1 | ls -1 | awk '{ printf("%2d %s\n", NR, $0) }' |
FNR | The record number of the currently processed file | |
$n | The n-th field in the current record, for n = 0, the entire record. $FS refers to the last field (see NF) | ls -l | awk '{ print $3 " " $9 }' |
NF | Number of fields | head -1 /etc/passwd | awk -F: '{ print NF }' |
FILENAME | Name of the current input file | |
OFS | Output field separator |
-W is followed by the name of a long option. $ awk --version awk: not an option: --version $ awk -W version mawk 1.3.4 20200120 … $ sudo apt install -y gawk … $ awk --version GNU Awk 5.1.0, API: 3.0 (GNU MPFR 4.1.0, GNU MP 6.2.1) … $ awk -W version GNU Awk 5.1.0, API: 3.0 (GNU MPFR 4.1.0, GNU MP 6.2.1) …
awk does not support Perl style regular expressions.