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Is there a way to find out with what parameters did the kernel boot?

For example if I specify noexec=off at the grub command line? Can I see this sort of info after the system has finished booting?

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The string of boot parameters the kernel was booted with is stored in the /proc/cmdline file. (/proc is a virtual filesystem that contains information about the running system and processes. There is a lot of useful information in there!)

To display it on a terminal, just run:

cat /proc/cmdline
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