My oracle linux showed the following errors:

Red Hat nash version 4.2.1.8 starting

INIT: version 2.05 booting

/etc/rc.d/rc.sysunit: line 16: /bin/awk: cannot allocate memory
/etc/rc.d/rc.sysunit: line 26: /bin/mount: Cannot allocate memory
/etc/rc.d/rc.sysunit: line 33: /bin/awk: Cannot allocate memory
/etc/rc.d/rc.sysunit: line 44: /bin/fgrep: Cannot allocate memory
/etc/rc.d/rc.sysunit: line 87: /bin/grep: Cannot allocate memory
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Therefore, the server can;t start up . Please help.

Thx

So what did you change that caused this? Unless physical RAM went bad, someones been playing with core configuration files, recompiled a kernel or some similar.

Try booting to a live CD and see what happens. If it boots, that'll at least give you an environment you can troubleshoot from. If it doesn't, replace your RAM.