Red Hat System Administration II

Instructions

1. Log in to the servera machine as the student user.

   [student@workstation ~]$ ssh student@servera
   ...output omitted...
   [student@servera ~]$

2. Create and execute a simple Bash script.

   1. Use the vim command to create the firstscript.sh file under your home directory.

      [student@servera ~]$ vim firstscript.sh

   2. Insert the following text, and save the file. The number of hash signs (#) is arbitrary.

      #!/usr/bin/bash
      echo "This is my first bash script" > ~/output.txt
      echo "" >> ~/output.txt
      echo "#####################################################" >> ~/output.txt

   3. Use the bash command to execute the script.

      [student@servera ~]$ bash firstscript.sh

   4. Review the output file that the script generated.

      [student@servera ~]$ cat output.txt
      This is my first bash script
      
      #####################################################

3. Add more commands to the firstscript.sh script, execute it, and review the output.

   1. Use the Vim text editor to edit the firstscript.sh script.

      [student@servera ~]$ vim firstscript.sh

      The following output shows the expected content of the firstscript.sh file:

      #!/usr/bin/bash
      #
      echo "This is my first bash script" > ~/output.txt
      echo "" >> ~/output.txt
      echo "#####################################################" >> ~/output.txt
      echo "LIST BLOCK DEVICES" >> ~/output.txt
      echo "" >> ~/output.txt
      lsblk >> ~/output.txt
      echo "" >> ~/output.txt
      echo "#####################################################" >> ~/output.txt
      echo "FILESYSTEM FREE SPACE STATUS" >> ~/output.txt
      echo "" >> ~/output.txt
      df -h >> ~/output.txt
      echo "#####################################################" >> ~/output.txt

   2. Make the firstscript.sh file executable by using the chmod command.

      [student@servera ~]$ chmod a+x firstscript.sh

   3. Execute the firstscript.sh script.

      [student@servera ~]$ ./firstscript.sh

   4. Review the output file that the script generated.

      [student@servera ~]$ cat output.txt
      This is my first bash script
      
      #####################################################
      LIST BLOCK DEVICES
      
      NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
      sr0     11:0    1  558K  0 rom
      vda    252:0    0   10G  0 disk
      ├─vda1 252:1    0    1M  0 part
      ├─vda2 252:2    0  200M  0 part /boot/efi
      ├─vda3 252:3    0  500M  0 part /boot
      └─vda4 252:4    0  9.3G  0 part /
      vdb    252:16   0    5G  0 disk
      vdc    252:32   0    5G  0 disk
      vdd    252:48   0    5G  0 disk
      
      #####################################################
      FILESYSTEM FREE SPACE STATUS
      
      Filesystem      Size  Used Avail Use% Mounted on
      devtmpfs        844M     0  844M   0% /dev
      tmpfs           888M     0  888M   0% /dev/shm
      tmpfs           355M  9.4M  346M   3% /run
      /dev/vda4       9.4G  1.7G  7.7G  18% /
      /dev/vda3       495M  161M  335M  33% /boot
      /dev/vda2       200M  7.6M  193M   4% /boot/efi
      tmpfs           178M     0  178M   0% /run/user/1000
      #####################################################

4. Remove the exercise files and return to the workstation machine.

   1. Delete the firstscript.sh and output.txt files.

      [student@servera ~]$ rm firstscript.sh output.txt

   2. Return to the workstation machine as the student user.

      [student@servera ~]$ exit
      logout
      Connection to servera closed.
      [student@workstation ~]$