Copy file to a different project

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We haven't implemented this feature for SageMathCloud yet, but will. In the meantime, the only way to solve this problem that stays entirely in SMC is to setup ssh key access between the two projects, use scp or rsync, and to use the ip address displayed when you type "/sbin/ifconfig tun0" for each machine.

This is not possible in general because the files in your project A are probably on a different virtual machine than your project B. However, there is the rare possibility that they happen to be on the same machine. In this case, because SMC is just Linux, the following may be possible after you open a terminal in both project A and B:

projectA> ls -l $HOME/filename
-rw-rw---- 1 xyz xyz 31 Jun 21 11:59 /projects/xyz/filename
projectA> chmod o+r $HOME/filename
projectA> ls -l $HOME/filename
-rw-rw-r-- 1 xyz xyz 31 Jun 21 11:59 /projects/xyz/filename

... where xyz is the project ID of project A. Now, in that rare case you should be able to do from the project B terminal:

projectB> cp /projects/xyz/filename .

Don't forget to change back permissions with:

projectA> chmod o-r $HOME/filename
projectA> ls -l $HOME/filename
-rw-rw---- 1 xyz xyz 31 Jun 21 11:59 /projects/xyz/filename

See also the Wikipedia page about chmod.