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| -rw-r--r-- | src/tools/awk.md | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/tools/awk.md b/src/tools/awk.md index 38b0cb1..f8aa0a8 100644 --- a/src/tools/awk.md +++ b/src/tools/awk.md @@ -59,6 +59,7 @@ multiple times. Actions with those patterns are **executed exactly once**. - `FS` _field separator_: regex to split records into fields, by default <space> - `NR` _number record_: number of current record +- `NF` _number fields_: number of fields in the current record ### Special statements & functions @@ -96,6 +97,12 @@ awk 'NR%2 == 0 { print $0 }' <file> The pattern `NR%2 == 0` matches every second record and the action `{ print $0 }` prints the whole record. +### Access last fields in records +```bash +echo 'a b c d e f' | awk '{ print $NF $(NF-1) }' +``` +Access last fields with arithmetic on the `NR` number of fields variable. + ### Capture in variables ```bash # /proc/<pid>/status |