[GRASS-user] How to quote temporal algebra expressions when using the inverse selection operator ! ?

GRASS GRASS user
1

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

2

On 2021-04-15 11:23, nik@nikosalexandris.net wrote:

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?

Unsure if the following is correct, it seems to work here:

for RELATION in equal follows precedes ;do
     t.select -s -d expression='A = A1 {!:, '"${RELATION}"'} A2'
done

Nikos