find command in brief

Basic Scripting

basic

User & Group Account Management

useradd
userdel
usermod

groupadd
groupdel
groupmod

chage

Basic - Shell Builtins

alias
echo
 expr
 printf
sleep

The sleep command suspends execution of a process for at least the interval specified. The sleep instruction suspends the calling process for at least the specified number of seconds (the default), minutes, hours or days.

Usage:
sleep number[suffix]
or:
sleep option

Suffix:
s (seconds)
m (minutes)
h (hours)
d (days)



 test
true and false
unset
wait
 yes

Server Perfomance Tunnig

uptime

The uptime command provides the information about the current time, how long the system has been running, how many users are currently logged on, and the system load averages for the past 1, 5, and 15 minutes.


[root@subrat ~]# uptime

10:09:52 up 70 days, 18:58,  4 user,  load average: 0.05, 0.00, 0.00

top

htop

free

iostat

sar

Basic - Text Processing

banner

basename

comm

csplit

cut

diff

dirname

ed

ex

fmt

fold

head

iconv

join

less

more

nl

paste

sed

sort

spell

strings

tail

tr

uniq

vi

wc

xargs

Basic - Network Utilities

ping




host 

The host command in linux is used to resolve a host name into an Internet Protocol (IP) address or an IP address into a host name. It is being treated as a DNS Lookup utility.

- To find the IP address of a Hostname.

[root@unixlinux ~]# host google.com
google.com has address 74.125.68.138
google.com has address 74.125.68.139
google.com has address 74.125.68.100
google.com has address 74.125.68.101
google.com has address 74.125.68.102
google.com has address 74.125.68.113

- To find the hostname of an IP address.

[root@unixlinux ~]# host 10.132.88.33
33.88.132.10.in-addr.arpa domain name pointer ip-10-132-88-33.ap-southeast-1.compute.internal.

-To query of type ANY record for the domain.

[root@unixlinux ~]# host -a google.com
Trying "google.com"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13858
;; flags: qr rd ra; QUERY: 1, ANSWER: 19, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;google.com.                    IN      ANY

;; ANSWER SECTION:
google.com.             88403   IN      NS      ns4.google.com.
google.com.             88403   IN      NS      ns1.google.com.
google.com.             88403   IN      NS      ns2.google.com.
google.com.             88403   IN      NS      ns3.google.com.
google.com.             120     IN      A       74.125.130.138
google.com.             120     IN      A       74.125.130.139
google.com.             120     IN      A       74.125.130.100
google.com.             120     IN      A       74.125.130.101
google.com.             120     IN      A       74.125.130.102
google.com.             120     IN      A       74.125.130.113
google.com.             300     IN      AAAA    2404:6800:4003:c01::8b
google.com.             600     IN      MX      20 alt1.aspmx.l.google.com.
google.com.             600     IN      MX      30 alt2.aspmx.l.google.com.
google.com.             600     IN      MX      40 alt3.aspmx.l.google.com.
google.com.             600     IN      MX      50 alt4.aspmx.l.google.com.
google.com.             600     IN      MX      10 aspmx.l.google.com.
google.com.             86400   IN      TYPE257 \# 19 0005697373756573796D616E7465632E636F6D
google.com.             86400   IN      SOA     ns1.google.com. dns-admin.google.com. 2014021800 7200 1800 1209600 300
google.com.             3600    IN      TXT     "v=spf1 include:_spf.google.com ip4:216.73.93.70/31 ip4:216.73.93.72/31 ~all"

Received 497 bytes from 10.132.88.2#53 in 5 ms

hostname

ifconfig

 inetd
ip


nslookup

netcat

 netstat

dig

telnet

ssh

scp

ftp
rdate
rlogin 
rsync

route
traceroute

elinks

wget