Cannot Allocate Memory

I got this error after trying to login to the server

-bash: /bin/egrep: Cannot allocate memory
-bash: /bin/fgrep: Cannot allocate memory
-bash: /bin/grep: Cannot allocate memory
-bash: /bin/grep: Cannot allocate memory

Also I notice my server load are was also high due to '/usr/sbin/httpd -k start -DSSL' taking half of my CPU process. I tried to killall -9 httpd and restart again. See all below
login as: wheel
wheel@user:
-bash: /bin/egrep: Cannot allocate memory
-bash: /bin/fgrep: Cannot allocate memory
-bash: /bin/grep: Cannot allocate memory
-bash: /bin/grep: Cannot allocate memory
[~]# su -
Password:
-bash: /bin/egrep: Cannot allocate memory
-bash: /bin/egrep: Cannot allocate memory
-bash: /bin/egrep: Cannot allocate memory
-bash: /bin/egrep: Cannot allocate memory
-bash: /bin/fgrep: Cannot allocate memory
-bash: /bin/grep: Cannot allocate memory
-bash: /bin/grep: Cannot allocate memory
-bash: /bin/cut: Cannot allocate memory
-bash: /bin/cut: Cannot allocate memory

After then I reliased I cannot pingt the server from same Lan network

root@t [~]# ping xxx.xxx.xxx.xxx
PING xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx) 56(84) bytes of data.
From xxx.xxx.xxx.xxx icmp_seq=1 Destination Host Unreachable
From xxx.xxx.xxx.xxx icmp_seq=2 Destination Host Unreachable
From xxx.xxx.xxx.xxx icmp_seq=3 Destination Host Unreachable
From xxx.xxx.xxx.xxx icmp_seq=5 Destination Host Unreachable

My server was totally offline!

When I type 'ls', it says
bash /bin/ls: Cannot allocate memory.

I have unplugged the server from datacenter. Right now the server is infront of me. Please advise what command and fixes should i do.