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I would like to see with what parameters the running kernel has been started. i.e., I mean those parameters that are specified with the append option, such as ipv6.disable=1 or rootfstype=ext2

Is there a way to display these options on a running system ?

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up vote 9 down vote accepted

Very simple:

cat /proc/cmdline

From man proc:

  Arguments passed to the Linux kernel at boot time.  Often done via a boot
  manager such as lilo(8) or grub(8).
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