Assignment 4

The aim of this assignment is to continue familiarization basic Unix commands, in particular the grep command. I've recorded a YouTube video that once again shows the process of accepting and cloning the assignment as well as describes the expectations for completion:

https://youtu.be/LauoIRe893A

Instructions

1. The repository contains a file sifs.txt with the following text:

   Determining Transmissivity Coefficients  
   Average Tractions
     crack 1 traction 1.319254
     crack 2 traction 1.496583
     crack 3 traction 1.319254
   sifs for crack 1
     1.473248 2.027327
   sifs for crack 2
     2.043960 2.043960
   sifs for crack 3
     2.027327 1.473248
   

   Using only grep, and pipes (|) along with regular expressions, write a single line command (it's okay to pipe the output of one grep command into another) that will extract only the numerical values after the text sifs for crack # from the file. The output after running your command should be:

   1.473248 2.027327
   2.043960 2.043960
   2.027327 1.473248
   

2. After you have verified your command works by printing the results to stdout wrap the entire command in quotes and use the quoted command as an argument to echo followed by a redirect > to a file called parse1.sh.

   • Example: If your final command is grep -i blah, then you should run:

     echo 'grep -i blah' > parse1.sh

3. Repeat 1-2, this time writing a command that will extract the same numerical values, while omitting the value for sif for crack 2. Redirect the command to an executable script named parse2.sh

4. Add parse1.sh and parse2.sh to the git repository, commit, and push back to Github.

Testing

If you would like to check to see if your solution is correct, run the following command at the Terminal command prompt:

python test.py

A status message of OK indicates you have the correct answer.