sash - the Stand Alone SHell for system recovery
Let me introduce you today to a package that is quite unknown as you hopefully never need it. But when you need it and have not thought about it before, it is probably already too late. I am talking about “sash” - the “Stand Alone SHell”. Yet another shell? Yes and no.
So what is about? Imagine the following case: You are running a machine and suddenly something goes totally wrong. Partition errors, missing libraries, you have messed around with libc, whatever. This can get you into serious trouble. You are fine, when you have the possibility to boot a recovery cd or something similar. But under some circumstances you might have to stick to the programs already installed though they seem to be broken. Maybe it is a virtual server somewhere on the web and you are only allowed to boot into a recovery mode giving you a prompt to your server. So you are trying to login as root but it just does not work for some reasons. Broken dependencies. Who knows.
The point is: When you login onto a machine for system recovery, you are already relying on a lot of tools and dependencies - though it only seems to be a shell. The shell might be linked against a couple of libraries, a lot of commands you want to run are not build in and therefore a bunch of external dependencies can bar your way. So what you actually might need in a situation of severe pain is a shell that provides you with as much essential tools as you need on its own without relying on external code.
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