Allow multiple --exec's

[jidanni]

Enhancement idea:

Even though one can run whole shell scripts, how about also allowing more than one "grass --exec"?

Perhaps allow multiple --exec's using Unix find(1)'s method:

-exec ... ... \; -exec ... ... \;

In fact it one fails, don't run the rest, just like Unix.

[mankoff]

Somewhat related - you can use HEREDOCs:

rm -fR ~/tmp/G
grass -c EPSG:3413 ./tmp/G --exec <<EOF
g.region -p
g.region e=100 n=100 res=10 -p
EOF

[jidanni]

Replying to mankoff:

Somewhat related - you can use HEREDOCs

Great to know, and should be documented.

(Alas I am mainly doing one-liners in Makefiles.)

[mankoff]

HEREDOCs work in Makefiles.

This seems like a bad idea ​https://stackoverflow.com/questions/5873025/heredoc-in-a-makefile

[jidanni]

Replying to mankoff:

HEREDOCs work in Makefiles.

This seems like a bad idea...

Yup, and that's why I learned perl while the other kids learned python. At least good old ";"'s still work.

[wenzeslaus]

Replying to jidanni:

Replying to mankoff:

Somewhat related - you can use HEREDOCs

Great to know, and should be documented.

It does not work in a way, at least I think, it should work, so that's partially the reason it is not in documentation. There is actually a ticket for it: #2639, so I suggest have further discussion on this there (if needed).

[wenzeslaus]

Back to the --exec ... \; --exec ... \; enhancement:

Before somebody dives into implementing this. Do you want to elaborate on the syntax, use cases, examples, edge cases, and similarities (and differences) to other tools besides find. That would be good to have before committing to support additional syntax when there are other ways to achieve the same (for example, aforementioned here document, an .sh script, or --exec bash -c "... ; ...;".)