Final Exam review exercises

Final Exam review exercises#

1. Shell scripts#

  • Below are two shell scripts. Script send.sh

#!/bin/bash 
ipaddr='192.168.122.11' 
port='9092' 
echo "provide input file name" 
read fname 
/bin/cat "$fname" | /bin/netcat -N "$ipaddr" $port

#!/bin/bash 
DIR='/home/hostadm' 
fname='fileget.out' 
port='9092' 
if [ -s "$DIR/$fname" ] 
then 
echo 'file exists' 
else 
/bin/netcat -N -l "$port" > "$DIR/$fname" 
fi

  • A) What do the scripts do?

  • B) Create a new VM. Put script receive.sh on the VM. Put script send.sh on the desktop, and modify variable ipaddr in the script to match the IP address of the VM. Run both the scripts to send/receive a file between the desktop and the VM.

2. Static and shared libraries. Header files.#

  • Install package libgpg-error-dev on your desktop.

  • What are the file names that contain static libraries, dynamic libraries, and header files in the package?

  • Specify the commands you used to find the file names.

3. Shell scripting#

  • Consider the following script:

#!/bin/bash
cmmd= /usr/bin/md5sum
for i in $(ls /etc); do
if [ ! -d  /etc/$i ] then
$cmmd /etc/$i
fi
done

It fails to run due to a few syntactic errors.

  • A) Find the errors in the script.

  • B) Explain what the script does.

4. Task scheduling#

  • A) Schedule the script to run once on July 9 at 11 pm.

  • B) Schedule the script to run every Wednesday at 10:15 AM.

5. Static and shared libraries#

  • Install package libgsl-dev on your desktop.

  • What are the file names that contain static and dynamic libraries in the package?

6. Compilation and Makefiles#

Download tar archive http://capone.rutgers.edu/coursefiles/matrix_gsl.tar and untar it.

A) Compile each of the files: matrix_show.c, matrix_view.c, matrix_write.c , and run the executables.
B) Develop a Makefile with the targets to compile each of the files.
C) Install make and run it for the targets.



7. Python scripting#

Start jupyter notebook in directory Python.

The tasks below, should be completed within jupyter notebook:

A) Create nested directory tree DIR1/DIR2/DIR3

B) Write words ‘task1’, ‘task2’, ‘task3’, and ‘task4’, each in new line, into file output.txt in directory DIR1/DIR2/DIR3

8. Python scripting#

A) Write a python script to find all files with extension .script in directory /usr.
B) Modify the script to provide the searchable filename as an argument. Run the scipt to find files with extensions .script, then .conf

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