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Systems Programming Assignment 4: More Scripting Solution
For this assignment, you will use awk, sed, and bash to create a simple templating engine. Your program should take as input a generic template with placeholders for generic data, a set of input files containing data which should be applied to the template, and a date. Instantiated templates using the input data will be output to a subdirectory.
This assignment requires only sed, awk, and bash. You may use any combination of these programs and are not required to use all of them. Do not use Python or any other languages/utilities.
Hint: Since you will need to produce many files from many inputs, it may be useful to use awk to generate sed and/or bash scripts.
Data Format
Data will be stored in the same format as the data in Assignment 1. For each course with an enrollment greater than 50, your program will use the provided template to generate an advisory report specifically for them.
Data files (i.e., of the same format as those generated in Assignment 1) will be stored inside a directory specified by the user.
Each file within that directory will be named based on the department code (two or three uppercase alphabetic characters), a course number (exactly four digits), and ending with an extension of .crs.
A course file consists of exactly five lines:
dept_code (two or three character string) dept_name (string with possible whitespace)
course_name (string with possible whitespace)
course_sched (string: either TH or MWF) course_start (start with no whitespace) course_end (string with no whitespace)
credit_hours (integer)
num_students (integer representing number of enrolled students)
Example file named MAT1311.crs
MAT M a t h e m a t i c s Calculus I
TH 8/26/19 12/11/19 3 62
Assignment 4: More Scripting Page 1 of 4
Templating
Templates will include variable names to be filled in with data using double square brackets. For any data file of the format described above, each of the variables (including the square brackets) should be substituted with the data’s actual value. Your program should work for arbitrary templates using the same variables listed below corresponding to the item values described. More than one variable may appear per line.
[[dept_code]]
[[dept_name]]
[[course_name]]
[[course_start]]
[[course_end]]
[[credit_hours]]
[[num_students]]
[[course_num]] (the course number as specified in the filename of the .crs file)
[[date]] (see below)
Example Template:*
< html
< body
3
<h1 NOTICE OF O V E R E N R O L L M E N T - COURSE [[ de pt _c od e ]] [[ c o u r s e _ n u m ]]←-
- [[ date ]] </ h1
<p
Dear Instructor ,
</p
<p
8
Your course , [[ c o u r s e _ n a m e ]] , sc he du le d
from [[ c o u r s e _ s t a r t ]] to←-
[[ c o u r s e _ e n d ]] , has
exceeded normal
capacity
with
an
←-
e n r o l l m e n t of [[ n u m _ s t u d e n t s ]]
students . This
must
be
←-
c or re ct ed within thirty days or
this
issue will be referred ←-
to the [[ de pt _n am e ]]
d e p a r t m e n t
for
further review .
</p
<p
- A d m i n i s t r a t i o n
</p
</ body
</ html
* This is only a single example of a single template! You must assume that multiple different templates, with various combinations of variables, will be ran against your program. Experiment with exercising your program using your own custom scripts, as none will be provided to you. This is to emphasize the notion that no single template should be used as a test instrument; your script will be tested against several unknown-to-you templates.
Assignment 4: More Scripting Page 2 of 4
Date Argument
The third command-line argument should be a date manually entered by the user of the format MM/DD/YYYY. This value should be substituted anywhere where [[date]] appears.
Output
All output files should be written to the directory defined by the last argument. This directory may or may not already exist. Each file should be named by the course’s department code and number, and with the extension .warn.
Script Execution
Your program should be invoked through a single bash file (see below) with four arguments: data directory, template file, date, and output directory. Assuming the program executes correctly, no output should be printed to the screen.
$ assign4.sh ./data assign4.template 12/16/2021 ./output
Assignment Data
Sample input files can be found in:
/usr/local/courses/ssilvestro/cs3423/Fall19/assign4.
Script Files
Your program may consist of multiple files:
assign4.sh - the main file which is initially invoked (required)
.awk files
.sed files
Note: If your program generates any intermediate awk or sed files during execution, name them beginning with the letter ’g’. Moreover, delete them when your program has completed.
Extra Credit (5 points)
Allow your program to take optional fifth and sixth arguments describing the character(s) sur-rounding the variables instead of double square brackets. This feature should work for the following characters as either the opening or closing symbol, “/”, “|”, “}”, and “{”. Note that these can be in any combination (e.g., starting with “{” and ending with “|”) If no fifth and sixth arguments are passed, the program should behave as normal. You may assume that if a fifth argument is passed,
Assignment 4: More Scripting Page 3 of 4
a sixth will be present, too.
Example:
$ assign4.sh ./data assign4.template 12/16/2021 ./output ’{’ ’|’
The above invocation should replace variables in the template such as {date| instead of [[date]].
Extra credit is not given to late assignments. All requirements must be met to qualify for extra credit.
Submission
Turn your assignment in via Blackboard. Your zip file, named abc123.zip should contain only your bash, awk, and sed files.
If you attempt the extra credit, name your file abc123_EC.zip. Without the _EC, your submission will be graded as normal.
Assignment 4: More Scripting Page 4 of 4
