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During test, I sometimes add/change boot parameters to /boot/grub/menu.lst (suse), or at the grub screen during boot.

How do I check what boot parameters have been used after the system is done booting?

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check this… it may be helpfull – BlueBerry - Vignesh4303 Aug 6 '12 at 9:09
The "kernel command line" which contains those "boot parameters" should be in the system log, accessible with the dmesg command. A copy of the kernel command line is also in /proc/cmdline. – sawdust Aug 6 '12 at 9:43
@sawdust, cat /proc/cmdline did the trick. – peonicles Aug 6 '12 at 10:05
@sawdust Please provide this as an answer, so it can be accepted. – Baarn Aug 6 '12 at 11:00
up vote 17 down vote accepted

The bootloader (grub in this case) will pass the boot parameters to the Linux kernel in a memory buffer called the kernel command line. The kernel command line, along with other console messages output during boot, should be in the system log, retrievable with the dmesg command.

A copy of the kernel command line is also in the file /proc/cmdline.

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