Bash - is it possible to write to memory rather than a file
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If you simply save in a variable, does that accomplish the same thing?
What problem are you trying to solve---ie why do you need to do this?
I don't think that variables are the best way to achieve that, since he mentioned needing multiple lines. Remember that the space for environment variables is far more finite than the available virtual memory, and the available virtual memory is the only limit for /dev/shm. By default, half of the memory is the limit, but it can be specified via a mount option for tmpfs.
That's the basic thing, it all depends on what do you exactly need to do. If you need a fifo instead of a regular file, you can create it as well. With a fifo, the contents will dissapear from the file as it's consumed by any program. A random link illustrating it: