Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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An alternative that will avoid the user agent trick is to curl | cat, which just prints the result of the first command to the console. curl >> filename.sh will write it to a script file that you can review and then mark executable and run if you deem it safe, which is safer than doing a curl | cat followed by a curl | bash (because it's still possible for the 2nd curl to return a different set of commands).
You can control the user agent with curl and spoof a browser's user agent for one fetch, then a second fetch using the normal curl user agent and compare the results to detect malicious urls in an automated way.
A command line analyzer tool would be nice for people who aren't as familiar with the commands (and to defeat obfuscation) and arguments, though I believe the problem is NP, so it won't likely ever be completely foolproof. Though maybe it can be if it is run in a sandbox to see what it does instead of just analyzed.