Shell variable must within single-quotes in awk command, just like '$A'
e.g. File fruit.txt content as follow
apple 99
orange 25
lemon 30
FRUIT=apple, To get number after $FRUIT
awk '/'$FRUIT'/ {print $2}' fruit.txt (Rignt)
awk '/$FRUIT/ {print $2}' fruit.txt (Wrong, not work)
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||
| 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| 18 | 19 | 20 | 21 | 22 | 23 | 24 |
| 25 | 26 | 27 | 28 | 29 | 30 | 31 |
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