In one of the t.rast.algebra related tests, the use of the ! operator is
demonstrated [0]:
t.rast.algebra", expression="R = A {!:,during} C", basename="r"
[0]
https://github.com/OSGeo/grass/blob/99464f8f520a8778564bafa9b2b47bcd8f893bf8/temporal/t.rast.algebra/testsuite/test_raster_algebra.py#L642)
I can't seem however to use it properly (in the command line, Linux,
bash ver. 5.0.7).
This
```
t.select -d expression="C = a1 : a2"
```
works, while this
```
t.select -d expression="C = a1 !: a2"
```
fails with
```
bash: : unrecognized history modifier
```
?
How should such an expression be quoted?
Thanks, Nikos
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