Basic linux Commands

[root@sysadmin ~]# uname -r
3.10.0-229.1.2.el7.x86_64
[root@sysadmin ~]# runlevel
N 5
[root@sysadmin ~]# who -r
         run-level 5  2015-05-07 10:41
[root@sysadmin ~]# users
root root
[root@sysadmin ~]# pwd
/root

[root@sysadmin ~]# uptime
 15:13:05 up  4:32,  2 users,  load average: 0.50, 0.69, 0.57
[root@sysadmin ~]# date
Thu May  7 15:13:19 IST 2015
[root@sysadmin ~]# tty
/dev/pts/0
[root@sysadmin ~]# umask
0022
[root@sysadmin ~]# who
root     :0           2015-05-07 10:44 (:0)
root     pts/0        2015-05-07 15:11 (:0)
[root@sysadmin ~]# whoami
root
[root@sysadmin ~]# logname
root
[root@sysadmin ~]# uname --n
sysadmin.myshala.lan
[root@sysadmin ~]# uname -n
sysadmin.myshala.lan
[root@sysadmin ~]# uname -p
x86_64
[root@sysadmin ~]# uname -m
x86_64
[root@sysadmin ~]# uname -s
Linux

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[root@sysadmin ~]# pwd
/root
[root@sysadmin ~]# !!
pwd
/root
[root@sysadmin ~]# alias hname=hostname
[root@sysadmin ~]# hname
sysadmin.myshala.lan
[root@sysadmin ~]# alias -p
alias cp='cp -i'
alias egrep='egrep --color=auto'
alias fgrep='fgrep --color=auto'
alias grep='grep --color=auto'
alias h='ls'
alias hname='hostname'
alias l.='ls -d .* --color=auto'
alias ll='ls -l --color=auto'
alias ls='ls --color=auto'
alias mv='mv -i'
alias rm='rm -i'
alias rvm-restart='rvm_reload_flag=1 source '\''/usr/local/rvm/scripts/rvm'\'''
alias which='alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde'
[root@sysadmin ~]# alias help
bash: alias: help: not found
[root@sysadmin ~]# alias --help
bash: alias: --: invalid option
alias: usage: alias [-p] [name[=value] ... ]
[root@sysadmin ~]# unalias h

[root@sysadmin ~]# stat autel
stat: cannot stat ‘autel’: No such file or directory
[root@sysadmin ~]# groups
root
[root@sysadmin ~]#
 ////////////////////////////////////////////////////////////////////////////////////////////////

[root@sysadmin home]# dir
cen  cent  laike9m  mahesh  myshala  myshala.lan253  root  solution  test
[root@sysadmin home]# eject
eject: /dev/cdrom: not found mountpoint or device with the given name
[root@sysadmin home]# dirs
/home
[root@sysadmin home]# arch
x86_64
[root@sysadmin home]# !ar
arch
x86_64

//////////////////////////////////////////////////////////////////////////////////////////////
  
          netstat -r
          netstat -a
          netstat -nvlt
          netstat -nvlp
          netstat -nvlm