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grep -E "Jun 6|Jun 7" error.log.1 > /mnt/aaa.log
cat error.log.1 | grep -E 98162
grep -E "suc|stop|getInOutBytes|found" error.log.1
egrep -iH "max|suc" /var/log/IBSng/MAIN/* --color
grep "89794" .log. | grep "Jun 17" --color
ssh root@172.16.4.12 'grep "19:06:25" /var/log/IBSng/ONLINE_WORKER/* >$

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ssh key

ssh-keygen -t rsa
cat ~/.ssh/id_rsa.pub | ssh -p 22 swapnil@remote-server ";mkdir -p ~/.ssh && cat >> ~/.ssh/authorized$

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install
  #time
    LC_ALL="en_US.UTF-8"
  #repository
    deb http://ftp.debian.org/debian/ testing main contrib non-free
    deb http://ftp.debian.org/debian wheezy main
  #after install package 
    apt-get install libc6-dev
    apt-get install python-mpi4py
    apt-get install openmpi-bin

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#check  connectivity in linux server and ldap 
python 
import ldap
 ldap.initialize("ldap://192.168.100.2:389")
 x = ldap.initialize("ldap://192.168.100.2:389")
 x.bind_s("USERNAME", "PASSWORD")
 
 after return error check error in website 
 
  http://wiki.servicenow.com/index.php?title=LDAP_Error_Codes#gsc.tab=0

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SNMP
apt-get install snmp
apt-get install snmp-mibs-downloader
download-mibs
cat /etc/snmp/snmp.conf → Add → mibs +ALL
Check MIB’s
snmptranslate -Tp

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Networking
#IPv4 Forwarding:
  nano /etc/sysctl.conf → Change 0 to 1 in ip_forward
  sysctl -p && echo 1 > /proc/sys/net/ipv4/ip_forward
#IPtables:
  iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
  iptables -A FORWARD -s 10.8.0.0/24 -j ACCEPT
  iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE

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OpenVPN Config
apt-get install openvpn easy-rsa
mkdir /etc/openvpn/easy-rsa
cp -rf /usr/share/easy-rsa/* /etc/openvpn/easy-rsa
Edit the vars file in order to create certificates information:
nano /etc/openvpn/easy-rsa/vars
cd /etc/openvpn/easy-rsa
source vars
./clean-all → Cleans everything in keys
./build-ca

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All connections to server
netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n
All connection States
netstat -nat | awk '{print $6}' | sort | uniq -c | sort -n
Limit HTTP connections to 20 sessions
iptables -I INPUT -p tcp --syn --dport 80 -m connlimit --connlimit-above
20 --connlimit-mask 24 -j DROP
Checking how many connections to 80
netstat -n | grep :80 |wc -l

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Users & Groups
Group file: /etc/group
Add User:
adduser USER
New Group:
groupadd GROUP
newgrp GROUP
Account numbering and important settings: /etc/login.defs
Own a user a folder:
chown -R USER FOLDER

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NMAP
Ping with nmap
nmap -sP IP
Port state
nmap --reason HOST
TCP connect() scan—(Nmap -sT )
TCP SYN or half-open scan—(Nmap -sS )
TCP FIN, XMAS, and NULL scans—(Nmap -sF , -sX , -sN )
TCP ACK scan—(Nmap -sA )
TCP idle scan—(Nmap -sI )