How to kill all session Xvnc

 

Step 1: List all processes of Xvnc

[root@VTGDB.COM tmp]# ps -ef | grep Xvnc
root     112273      1  1 14:22 pts/0    00:00:00 /usr/bin/Xvnc :1 -desktop VTGDB.COM:1 (root) -auth /root/.Xauthority -geometry 1024x768 -rfbwait 30000 -rfbauth /root/.vnc/passwd -rfbport 5901 -fp catalogue:/etc/X11/fontpath.d -pn
root     112688 110375  0 14:22 pts/0    00:00:00 grep Xvnc

Step 2: Kill all processes of Xvnc

[root@VTGDB.COM tmp]# kill -9 112273

Step 3: Delete all file .X*-lock

[root@VTGDB.COM tmp]# cd /tmp
[root@VTGDB.COM tmp]# ls -a
 sess_8dmq10bg3vnbdcrcqo9ogpsi55  sess_ngvl5qf7pgv4ill44lbfa0q084  .X11-unix
db2chgpath_db2.log.73213   db2prereqcheck.log.128450  .esd-54323                .ICE-unix               .java_pid63614   orbit-oracle                seahorse-KUSesH                  sess_98ta84ni8cvcp1eo18auf3ccd0  sess_tvabjtkkmseko3t3e3q4c69o54  .X1-lock

[root@VTGDB.COM tmp]# rm -fr .X1-lock
[root@VTGDB.COM tmp]# cd .X11-unix/
[root@VTGDB.COM .X11-unix]# ls
X1
[root@VTGDB.COM .X11-unix]# rm -fr *
[root@VTGDB.COM .X11-unix]#

How to fix: Cannot grab required information(TMOUT) from /etc/profile

[PROBLEM] Cannot grab required information(TMOUT) from /etc/profile [FIXED] Edit file /etc/profile, add following line to end of file. vi /etc/profile # set a 5 min timeout policy for bash shell TMOUT=300 readonly TMOUT export TMOUT

How to set an expiration date for user' password on Linux

Step 1: Open file /etc/login.defs, change option for PASS_MAX_DAYS, For example:

# Password aging controls:
#
#       PASS_MAX_DAYS   Maximum number of days a password may be used.
#       PASS_MIN_DAYS   Minimum number of days allowed between password changes.
#       PASS_MIN_LEN    Minimum acceptable password length.
#       PASS_WARN_AGE   Number of days warning given before a password expires.
#
PASS_MAX_DAYS   90

Step 2: With exist user, you can change expiration date via command:

[root@VTGDB.COM ~]# chage -M 90 username

How to install php 5.5.1.0 on linux

Step 1: Download the software

https://drive.google.com/open?id=0B7a3DEnQ0-uzXzlsU04xcGdJN0E

 

Step 2: Untar the downloaded file

[root@VTGDB.COM ~]# tar -xvf oel-dependency-install.tar.gz

oel-dependency-install/

oel-dependency-install/dependency-install.sh

oel-dependency-install/._libjpeg-turbo-1.2.1-3.el6_5.x86_64.rpm

oel-dependency-install/libjpeg-turbo-1.2.1-3.el6_5.x86_64.rpm

oel-dependency-install/._openssl-1.0.1e-16.el6_5.x86_64.rpm

oel-dependency-install/openssl-1.0.1e-16.el6_5.x86_64.rpm

oel-dependency-install/oracle-instantclient12.1-basic-12.1.0.1.0-1.x86_64.rpm

oel-dependency-install/oracle-instantclient12.1-sqlplus-12.1.0.1.0-1.x86_64.rpm

oel-dependency-install/php55-5.5.10-1.el6.x86_64.rpm

oel-dependency-install/php55-bcmath-5.5.10-1.el6.x86_64.rpm

oel-dependency-install/php55-cli-5.5.10-1.el6.x86_64.rpm

oel-dependency-install/php55-common-5.5.10-1.el6.x86_64.rpm

oel-dependency-install/php55-dba-5.5.10-1.el6.x86_64.rpm

oel-dependency-install/php55-fpm-5.5.10-1.el6.x86_64.rpm

oel-dependency-install/php55-gd-5.5.10-1.el6.x86_64.rpm

oel-dependency-install/php55-intl-5.5.10-1.el6.x86_64.rpm

oel-dependency-install/php55-ldap-5.5.10-1.el6.x86_64.rpm

oel-dependency-install/php55-mbstring-5.5.10-1.el6.x86_64.rpm

oel-dependency-install/php55-mysql-5.5.10-1.el6.x86_64.rpm

oel-dependency-install/php55-oci8-12cR1-5.5.10-2.el6.x86_64.rpm

oel-dependency-install/php55-opcache-5.5.10-1.el6.x86_64.rpm

oel-dependency-install/php55-pdo-5.5.10-1.el6.x86_64.rpm

oel-dependency-install/php55-xml-5.5.10-1.el6.x86_64.rpm

Step 3: Install the software

[root@VTGDB.COM ~]# cd oel-dependency-install

[root@VTGDB.COM oel-dependency-install]# ls

dependency-install.sh                                   oracle-instantclient12.1-sqlplus-12.1.0.1.0-1.x86_64.rpm  php55-common-5.5.10-1.el6.x86_64.rpm  php55-intl-5.5.10-1.el6.x86_64.rpm      php55-oci8-12cR1-5.5.10-2.el6.x86_64.rpm

libjpeg-turbo-1.2.1-3.el6_5.x86_64.rpm                  php55-5.5.10-1.el6.x86_64.rpm                             php55-dba-5.5.10-1.el6.x86_64.rpm     php55-ldap-5.5.10-1.el6.x86_64.rpm      php55-opcache-5.5.10-1.el6.x86_64.rpm

openssl-1.0.1e-16.el6_5.x86_64.rpm                      php55-bcmath-5.5.10-1.el6.x86_64.rpm                      php55-fpm-5.5.10-1.el6.x86_64.rpm     php55-mbstring-5.5.10-1.el6.x86_64.rpm  php55-pdo-5.5.10-1.el6.x86_64.rpm

oracle-instantclient12.1-basic-12.1.0.1.0-1.x86_64.rpm  php55-cli-5.5.10-1.el6.x86_64.rpm                         php55-gd-5.5.10-1.el6.x86_64.rpm      php55-mysql-5.5.10-1.el6.x86_64.rpm     php55-xml-5.5.10-1.el6.x86_64.rpm

[root@VTGDB.COM oel-dependency-install]# ./dependency-install.sh

Installing OMSS OEL dependencies...

Removing old versions of oracle-instantclient

rpm: no packages given for erase

Removing old versions of php...

rpm: no packages given for erase

Installing openssl-1.0.1e-16.el6_5.x86_64.rpm...

warning: openssl-1.0.1e-16.el6_5.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID ec551f03: NOKEY

Preparing...                ########################################### [100%]

            package openssl-1.0.1e-30.el6.x86_64 (which is newer than openssl-1.0.1e-16.el6_5.x86_64) is already installed

Installing libjpeg-turbo-1.2.1-3.el6_5.x86_64.rpm...

warning: libjpeg-turbo-1.2.1-3.el6_5.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID ec551f03: NOKEY

Preparing...                ########################################### [100%]

            package libjpeg-turbo-1.2.1-3.el6_5.x86_64 is already installed

Installing oracle-instantclient12.1-basic-12.1.0.1.0-1.x86_64.rpm..

Preparing...                ########################################### [100%]

   1:oracle-instantclient12.########################################### [100%]

Installing oracle-instantclient12.1-sqlplus-12.1.0.1.0-1.x86_64.rpm...

Preparing...                ########################################### [100%]

   1:oracle-instantclient12.########################################### [100%]

Reloading ldconfig...

Intalling php55-common-5.5.10-1.el6.x86_64.rpm...

Preparing...                ########################################### [100%]

   1:php55-common           ########################################### [100%]

Intalling php55-cli-5.5.10-1.el6.x86_64.rpm...

Preparing...                ########################################### [100%]

   1:php55-cli              ########################################### [100%]

Intalling php55-5.5.10-1.el6.x86_64.rpm...

Preparing...                ########################################### [100%]

   1:php55                  ########################################### [100%]

Intalling php55-bcmath-5.5.10-1.el6.x86_64.rpm...

Preparing...                ########################################### [100%]

   1:php55-bcmath           ########################################### [100%]

Intalling php55-dba-5.5.10-1.el6.x86_64.rpm...

Preparing...                ########################################### [100%]

   1:php55-dba              ########################################### [100%]

Intalling php55-fpm-5.5.10-1.el6.x86_64.rpm...

Preparing...                ########################################### [100%]

   1:php55-fpm              ########################################### [100%]

Intalling php55-gd-5.5.10-1.el6.x86_64.rpm...

Preparing...                ########################################### [100%]

   1:php55-gd               ########################################### [100%]

Intalling php55-intl-5.5.10-1.el6.x86_64.rpm...

Preparing...                ########################################### [100%]

   1:php55-intl             ########################################### [100%]

Intalling php55-ldap-5.5.10-1.el6.x86_64.rpm...

Preparing...                ########################################### [100%]

   1:php55-ldap             ########################################### [100%]

Intalling php55-mbstring-5.5.10-1.el6.x86_64.rpm...

Preparing...                ########################################### [100%]

   1:php55-mbstring         ########################################### [100%]

Intalling php55-pdo-5.5.10-1.el6.x86_64.rpm...

Preparing...                ########################################### [100%]

   1:php55-pdo              ########################################### [100%]

Intalling php55-mysql-5.5.10-1.el6.x86_64.rpm...

Preparing...                ########################################### [100%]

   1:php55-mysql            ########################################### [100%]

Intalling php55-oci8-12cR1-5.5.10-2.el6.x86_64.rpm...

Preparing...                ########################################### [100%]

   1:php55-oci8-12cR1       ########################################### [100%]

Intalling php55-opcache-5.5.10-1.el6.x86_64.rpm...

Preparing...                ########################################### [100%]

   1:php55-opcache          ########################################### [100%]

Intalling php55-xml-5.5.10-1.el6.x86_64.rpm...

Preparing...                ########################################### [100%]

   1:php55-xml              ########################################### [100%]

  

Step 4: Check new installed php

[root@VTGDB.COM oel-dependency-install]# rpm -qa | grep php

php55-opcache-5.5.10-1.el6.x86_64

php55-common-5.5.10-1.el6.x86_64

php55-intl-5.5.10-1.el6.x86_64

php55-pdo-5.5.10-1.el6.x86_64

php55-cli-5.5.10-1.el6.x86_64

php55-mbstring-5.5.10-1.el6.x86_64

php55-dba-5.5.10-1.el6.x86_64

php55-oci8-12cR1-5.5.10-2.el6.x86_64

php55-bcmath-5.5.10-1.el6.x86_64

php55-mysql-5.5.10-1.el6.x86_64

php55-gd-5.5.10-1.el6.x86_64

php55-xml-5.5.10-1.el6.x86_64

php55-fpm-5.5.10-1.el6.x86_64

php55-ldap-5.5.10-1.el6.x86_64

php55-5.5.10-1.el6.x86_64

[root@VTGDB.COM oel-dependency-install]# ls

dependency-install.sh                                   oracle-instantclient12.1-sqlplus-12.1.0.1.0-1.x86_64.rpm  php55-common-5.5.10-1.el6.x86_64.rpm  php55-intl-5.5.10-1.el6.x86_64.rpm      php55-oci8-12cR1-5.5.10-2.el6.x86_64.rpm

libjpeg-turbo-1.2.1-3.el6_5.x86_64.rpm                  php55-5.5.10-1.el6.x86_64.rpm                             php55-dba-5.5.10-1.el6.x86_64.rpm     php55-ldap-5.5.10-1.el6.x86_64.rpm      php55-opcache-5.5.10-1.el6.x86_64.rpm

openssl-1.0.1e-16.el6_5.x86_64.rpm                      php55-bcmath-5.5.10-1.el6.x86_64.rpm                      php55-fpm-5.5.10-1.el6.x86_64.rpm     php55-mbstring-5.5.10-1.el6.x86_64.rpm  php55-pdo-5.5.10-1.el6.x86_64.rpm

oracle-instantclient12.1-basic-12.1.0.1.0-1.x86_64.rpm  php55-cli-5.5.10-1.el6.x86_64.rpm                         php55-gd-5.5.10-1.el6.x86_64.rpm      php55-mysql-5.5.10-1.el6.x86_64.rpm     php55-xml-5.5.10-1.el6.x86_64.rpm

[root@VTGDB.COM oel-dependency-install]#

SSH Login & SCP Without Password Using ssh-keygen & ssh-copy-id

admin@local-host$ ssh-keygen

Generating public/private rsa key pair.

Enter file in which to save the key (/home/admin/.ssh/id_rsa):[Enter key]

Enter passphrase (empty for no passphrase): [Press enter key]

Enter same passphrase again: [Press enter key]

Your identification has been saved in /home/admin/.ssh/id_rsa.

Your public key has been saved in /home/admin/.ssh/id_rsa.pub.

The key fingerprint is:

33:b3:fe:af:95:95:18:11:31:d5:de:96:2f:f2:35:f9 admin@local-host

admin@local-host$ ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host

admin@remote-host's password:

Now try logging into the machine, with "ssh 'remote-host'", and check in:

.ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

Install Redhat 6

Link https://www.facebook.com/cold.xxboy/videos/10205021218482462/

How to allow a OS user running crontab

[root@PTUD-VM03-1 ~]# more /etc/cron.allow

root

oracle

How to vncviewer with your size

$ vncserver -geometry 1920x1080

How to see files'size and sort them on one folder Linux

[oracle@PTUD-VM02-2 datafile]$ ls --reverse --sort=size  -sh *

How to start network linux automatically

Step 1: Check your network

[root@PTUDServer3 ~]# ifconfig -a

eth0      Link encap:Ethernet  HWaddr 74:46:A0:98:D0:BE 

          inet addr:192.168.2.133  Bcast:10.61.118.255  Mask:255.255.255.0

          inet6 addr: fe80::7646:a0ff:fe98:d0be/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:7002 errors:0 dropped:0 overruns:0 frame:0

          TX packets:1357 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:592469 (578.5 KiB)  TX bytes:118837 (116.0 KiB)

lo        Link encap:Local Loopback 

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::1/128 Scope:Host

          UP LOOPBACK RUNNING  MTU:16436  Metric:1

          RX packets:2456 errors:0 dropped:0 overruns:0 frame:0

          TX packets:2456 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0

          RX bytes:278546 (272.0 KiB)  TX bytes:278546 (272.0 KiB)

virbr0    Link encap:Ethernet  HWaddr 52:54:00:D9:D3:A7 

          inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0

          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

virbr0-nic Link encap:Ethernet  HWaddr 52:54:00:D9:D3:A7 

          BROADCAST MULTICAST  MTU:1500  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:500

          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

Step 2: Set ONBOOT=yes

[root@PTUDServer3 ~]#vi /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0

TYPE=Ethernet

UUID=c47a963d-3fb0-44f5-b3c7-4ff8d619a043

ONBOOT=yes

NM_CONTROLLED=yes

BOOTPROTO=none

DEFROUTE=yes

IPV4_FAILURE_FATAL=yes

IPV6INIT=no

NAME="System eth0"

IPADDR=192.168.2.133

PREFIX=24

GATEWAY=192.168.1.1

DNS1=10.79.255.10

HWADDR=74:46:A0:98:D0:BE

DOMAIN=10.79.255.12

LAST_CONNECT=1443171251

Step 3: Start network with OS.

[root@PTUDServer3 ~]# chkconfig network on

Step 4: Test Network

[root@PTUDServer3 ~]# service network restart

Shutting down interface eth0:  Device state: 3 (disconnected)

                                                           [  OK  ]

Shutting down loopback interface:                          [  OK  ]

Bringing up loopback interface:                            [  OK  ]

Bringing up interface eth0:  Active connection state: activated

Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/1

                                                           [  OK  ]

[root@PTUDServer3 ~]# ping 8.8.8.8

PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.

64 bytes from 8.8.8.8: icmp_seq=1 ttl=46 time=65.6 ms

Forwarding Network

Describe:
End User cannot access Server B via port 8000.
End User can access Server A via port 8000.
How to End User can access application on Server B which running port 8000?

Before Forwarding, end user cannot access via 8000.

Details:

1. Check Port Forwarding:

[root@PTUD-S05 ~]# ifconfig bond0     Link encap:Ethernet  HWaddr 44:A8:42:18:29:55             inet addr:IP_SERVER_A  Bcast:10.30.164.191  Mask:255.255.255.192           inet6 addr: fe80::46a8:42ff:fe18:2955/64 Scope:Link           UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1           RX packets:5433 errors:0 dropped:0 overruns:0 frame:0           TX packets:2084 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:0            RX bytes:540826 (528.1 KiB)  TX bytes:299158 (292.1 KiB) [root@PTUD-S05 ~]# cat /proc/sys/net/ipv4/conf/bond0/forwarding  0 [root@PTUD-S05 ~]# echo '1' > /proc/sys/net/ipv4/conf/bond0/forwarding  [root@PTUD-S05 ~]# cat /proc/sys/net/ipv4/conf/bond0/forwarding  1

2. Edit iptables for forwarding/

[root@PTUD-S05 ~]# vi /etc/sysconfig/iptables # Generated by iptables-save v1.4.7 on Sat Sep 12 02:31:44 2015 *nat :PREROUTING ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A PREROUTING -i bond0 -p tcp -m tcp --dport 8000 -j DNAT --to-destination IP_Server_B:8000 -A POSTROUTING -o bond0 -p tcp -m tcp -d IP_Server_B --dport 8000 -j SNAT --to-source IP_Server_A COMMIT # Completed on Sat Sep 12 02:31:44 2015 # Generated by iptables-save v1.4.7 on Sat Sep 12 02:31:44 2015 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [779:107936] -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -p tcp -m tcp --dport 21 -j ACCEPT #-A INPUT -j REJECT --reject-with icmp-host-prohibited #-A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT # Completed on Sat Sep 12 02:31:44 2015

3. Restart Iptables to apply it.

[root@PTUD-S05 ~]# service iptables restart iptables: Setting chains to policy ACCEPT: filter nat      [  OK  ] iptables: Flushing firewall rules:                         [  OK  ] iptables: Unloading modules:                               [  OK  ] iptables: Applying firewall rules:                         [  OK  ] [root@PTUD-S05 ~]#

After Forwarding:

create an user OS which has privilege like root user

I will create user "bigdata" which has privilege like root user
[root@PTUD-VM02-4 ~]# chmod 640 /etc/sudoers
[root@PTUD-VM02-4 ~]# vi /etc/sudoers
## Allow root to run any commands anywhere
root    ALL=(ALL)       ALL
bigdata    ALL=(ALL)       ALL

[root@PTUD-VM02-4 ~]# chmod 440 /etc/sudoers

Adding User on linux

[root@PTUD-VM01-2 ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_ptudvm011-LogVol00
                       20G  8.5G   11G  46% /
tmpfs                 7.8G   72K  7.8G   1% /dev/shm
/dev/sda1             976M   36M  890M   4% /boot
/dev/mapper/vg_ptudvm011-LogVol03
                       49G   52M   46G   1% /u01
/dev/mapper/vg_ptudvm011-LogVol01
                       20G  361M   19G   2% /var
[root@PTUD-VM01-2 ~]# useradd wccc -d /u01/wccc
[root@PTUD-VM01-2 ~]# passwd wccc
Changing password for user wccc.
New password:
BAD PASSWORD: is too simple
Retype new password:
BAD PASSWORD: is too simple
Retype new password:
passwd: all authentication tokens updated successfully.
[root@PTUD-VM01-2 ~]# su - wccc
[wccc@PTUD-VM01-2 ~]$ pwd
/u01/wccc

Check connection to Linux server

Syntax:
traceroute -nT   -p
Example:
[root@ptud ~]# traceroute -nT 10.79.255.87 -p 22
traceroute to 10.79.255.87 (10.79.255.87), 30 hops max, 60 byte packets
 1  192.168.2.158  0.511 ms  1.071 ms  1.320 ms
 2  192.168.2.1  9.100 ms  9.121 ms  9.105 ms
 3  10.79.255.253  16.590 ms  16.575 ms  16.555 ms

 4  10.79.255.87  15.941 ms  15.818 ms  15.880 ms

How to set security ssh on linux

[root@App1 ~]# vi /etc/ssh/sshd_config
### insert the command to apply only monitor, survey, oam user OS can ssh from anywhere, others ### cannot ssh from other machine
AllowUsers monitor survey oam

Now, Restart sshd
[root@App1 ~]# /etc/init.d/sshd restart
Stopping sshd:                                             [  OK  ]
Starting sshd:                                             [  OK  ]
[root@App1 ~]#

How to fix error while loading shared libraries: libgcc_s.so.1: cannot open shared object file: No such file or directory

[root@vcr-broadcast2 tmp]# rpm -q libgc
rpm: error while loading shared libraries: libgcc_s.so.1: cannot open shared object file: No such file or directory
[root@vcr-broadcast2 tmp]#
[root@vcr-broadcast2 tmp]# export LD_LIBRARY_PATH=${prefix}/lib:$LD_LIBRARY_PATH

RPM to install packets for Redhat using option --nodeps

Install Packet
[root@vcr-broadcast2 setup]# rpm -ivh glibc-headers-2.21.90-18.fc24.i686.rpm 
error: Failed dependencies:
glibc = 2.21.90-18.fc24 is needed by glibc-headers-2.21.90-18.fc24.i686
kernel-headers is needed by glibc-headers-2.21.90-18.fc24.i686
kernel-headers >= 2.2.1 is needed by glibc-headers-2.21.90-18.fc24.i686
[root@vcr-broadcast2 setup]# rpm -ivh --nodeps glibc-headers-2.21.90-18.fc24.i686.rpm 
Preparing...                ########################################### [100%]
   1:glibc-headers          ########################################### [100%]
Uninstall packet.
[root@vcr-broadcast2 setup]# rpm -ev libstdc++-devel-5.1.1-4.fc23.i686
error: Failed dependencies:
libstdc++-devel = 4.4.4-13.el6 is needed by (installed) gcc-c++-4.4.4-13.el6.x86_64
[root@vcr-broadcast2 setup]# rpm -ev --nodeps libstdc++-devel-5.1.1-4.fc23.i686
[root@vcr-broadcast2 setup]#

See version of Red hat or Centos

[oracle@ptudvtg149 PT8.54]$ cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 6.5 (Santiago)

Scripts see Memory Static every 5 seconds

[oracle@ptud1 PT8.54]$ more tho.sh
while true
do
free
echo "-----VTG-----------" $(date) "-----------------"
sleep 5
done
[oracle@ptud1 PT8.54]$ sh tho.sh
             total       used       free     shared    buffers     cached
Mem:       8062556    7894200     168356          0     104628    3922636
-/+ buffers/cache:    3866936    4195620
Swap:      8191992      48316    8143676
-----VTG----------- Tue Jul 14 16:58:48 ICT 2015 -----------------
             total       used       free     shared    buffers     cached
Mem:       8062556    7894588     167968          0     104636    3922636
-/+ buffers/cache:    3867316    4195240
Swap:      8191992      48316    8143676
-----VTG----------- Tue Jul 14 16:58:53 ICT 2015 -----------------
             total       used       free     shared    buffers     cached
Mem:       8062556    7894960     167596          0     104640    3922636
-/+ buffers/cache:    3867684    4194872
Swap:      8191992      48316    8143676
-----VTG----------- Tue Jul 14 16:58:58 ICT 2015 -----------------

Simply Example of grep on linux

Do you want to find content of file on directory on linux?
I'd like to give you a simply command to do that.
Syntax:
grep -ril {content what you want to search} {path of the directory}
Example:

[oracle@ptud1 unix]$ grep -ril "grant select" .

./psroles.sql

./psroles.log

./connect.sql

./connect.log

./pdb/psroles2.sql

./pdb/connect.sql

[oracle@ptud1 unix]$