In many situations, I need some tools to make my life easier. On this page I describe awk or better some case I needed awk for.
It's a scripting language for editing and analyzing texts. Input data is always processed line by line.
The name is derived from the initials of the developers
- Alfred V. Aho
- Peter J. Weinberger and
- Brian W. Kernighan
Give is a string, separated by new lines with a tuple of values (e.g. ColumnX, ValueX, etc.).
| No# | |||
|---|---|---|---|
| 1 | C1 | C2 | C3 |
| 2 | V1 | V2 | V3 |
| 3 | 1 | 2 | 3 |
| 4 | A | B | C |
To print out the value of the second columns only:
echo "C1 C2 C3\nV1 V2 V3\n1 2 3\nA B C" | awk '{ print $2 }'
C2
V2
2
BChanging the paramater $2 (e.g. to $1, $3) prints out the first or the third column.
What I describe as a row named the oficial documentation record.
To print out a value of a specific record (e.g. the second), we can use NR (Number of Records) like this:
echo "C1 C2 C3\nV1 V2 V3\n1 2 3\nA B C" | awk 'NR==2 { print $2 }'
V2