So working with an older CentOS 5.1 system today, I ran into a problem which I believed to be mkinitrd related when attempting to install kernel-PAE on a vmguest I upgraded to 4GB of vRAM.
I was seeing this upon yum installing kernel-PAE:
/sbin/mkinitrd: line 489: syntax error in conditional expression: unexpected token `('
/sbin/mkinitrd: line 489: syntax error near `^(d'
/sbin/mkinitrd: line 489: ` if [[ "$device" =~ ^(dm-|mapper/|mpath/) ]]; then'
So it turns out that bash was the problem here not mkinitrd. I never thought that mkinitrd and bash would be so intertwined, but it makes perfect sense if you think about it. I just never had to think about it ’til today.
I guess that serves us right for not keeping up with CentOS releases. A big thanks to SmogMonkey for posting this find on http://www.howtoforge.com/software-raid1-grub-boot-fedora-8-p2#comment-33804.
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