bzip2: Cannot exec: No such file or directory

Error when trying to create tar.bz2 Archive File in CentOS 7

The following is the error output when trying to create tar.bz2 file in CentOS7:

$ tar cvfj testfile.tar.bz2 ./testfile*
tar (child): bzip2: Cannot exec: No such file or directory
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not recoverable: exiting now
$

First step is to check if the package is installed or not.
$ sudo yum list installed | grep bzip2

If package is not installed, please run the following:
# yum install bzip2
# exit

Then create tar.bz2 file.
$ tar cvfj testfile.tar.bz2 ./testfile*

Issue: CentOS 7 network not in VirtualBox

Issue: Fresh installed CentOS 7 network interface not working.

[root@localhost slean]# ip addr
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
   link/ether 08:00:27:c8:da:c2 brd ff:ff:ff:ff:ff:ff
[root@localhost slean]#

As you can see the interface doesn't have IP address.

To fix this issue, first edit the network interface.  nmtui is a network manager tool user interface.
[root@localhost slean]# nmtui

Select the interface and click "Edit".

Enable the DHCP by setting the Automatically connect and make sure the IPv4 CONFIGURATION to <Automatic>.

Click <OK> and <Quit>.

[root@localhost slean]# system restart network

[root@localhost slean]# ip addr

Source: krizna.com

Commands to check CentOS version

These are the commands on CentOS to check version:

# hostnamectl
# rpm --query centos-release
# cat /etc/centos-release
# cat /etc/os-release
# cat /etc/redhat-release
# cat /etc/system-release

Note:
# uname -a
and
# uname -r
will not give the OS version in detail.

[root@localhost slean]# hostnamectl
      Static hostname: localhost.localdomain
              Icon name: computer
                   Chassis: n/a
            Machine ID: e6450196561343d9976ba0d9c29c54c0
                  Boot ID: 0ddca677a08a44019c0f9b71fec2882a
         Virtualization: vmware
  Operating System: CentOS Linux 7 (Core)
       CPE OS Name: cpe:/o:centos:centos:7
                    Kernel: Linux 3.10.0-229.11.1.el7.x86_64
           Architecture: x86_64
[root@localhost slean]#

Similar result from running # hostnamectl on Oracle VirtualBox

[root@localhost ~]# hostnamectl

   Static hostname: localhost.localdomain

         Icon name: computer-vm

           Chassis: vm

        Machine ID: ec0ea531f8894f84b9d5266ee38dfd8a

           Boot ID: d1fa0335dab445fca139710b318734a8

    Virtualization: oracle

  Operating System: CentOS Linux 8 (Core)

       CPE OS Name: cpe:/o:centos:centos:8

            Kernel: Linux 4.18.0-193.14.2.el8_2.x86_64

      Architecture: x86-64

[root@localhost ~]#

Another way to get the CentOS version is by 

[slean@localhost ~]$ cat /etc/os-release

NAME="CentOS Linux"

VERSION="7 (Core)"

ID="centos"

ID_LIKE="rhel fedora"

VERSION_ID="7"

PRETTY_NAME="CentOS Linux 7 (Core)"

ANSI_COLOR="0;31"

CPE_NAME="cpe:/o:centos:centos:7"

HOME_URL="https://www.centos.org/"

BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"

CENTOS_MANTISBT_PROJECT_VERSION="7"

REDHAT_SUPPORT_PRODUCT="centos"

REDHAT_SUPPORT_PRODUCT_VERSION="7"

[slean@localhost ~]$ 

The next 3 commands give the same output result

[slean@localhost ~]$ cat /etc/centos-release

CentOS Linux release 7.1.1503 (Core) 

[slean@localhost ~]$ 

[slean@localhost ~]$ cat /etc/redhat-release

CentOS Linux release 7.1.1503 (Core) 

[slean@localhost ~]$ 

[slean@localhost ~]$ cat /etc/system-release

CentOS Linux release 7.1.1503 (Core) 

[slean@localhost ~]$ 

Source: https://linuxconfig.org/how-to-check-centos-version

Python Notes

To find out where Python is installed in your Linux machine run the following commands:

~$ which python
/usr/bin/python

~$ which python3
/usr/bin/python3

To find out what Python version is running in your Linux box, run the following commands:

~$ python -V
Python 2.7.6

~$ python3 -V
Python 3.4.3

To start programing Python, run the following command:

~$ python
Python 2.7.6 (default, Jun 22 2015, 17:58:13)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.

>>>

Use exit() or Ctrl-D (i.e. EOF) to exit

>>>

To exit type the following

>>> exit()

~$

~$ python3

Python 3.4.3 (default, Oct 14 2015, 20:28:29)

[GCC 4.8.4] on linux

Type "help", "copyright", "credits" or "license" for more information.

>>> exit()

~$