This lab should be completed by editing and submitting this HTML file and by submitting scripts and output files.
Submit via all materials by D2L by the end of the lab session.
Write and test a script called, builtin_while.sh
that uses a while loop and the shift command to
solve Exercise 1 from Lab 6. Your script should be tested
with:
./builtin_while.sh cd ls read for echo ps bind w then declare shift help printf grep
Submit builtin_while.sh.
A file contains lines, where each line contains either the
name of colour, the time, or dollar amount. The colour is either
red, green or blue. Time is in the format HH:MM, where HH is the
hour and MM is the minutes. The dollar amount varies from
$X.YY to $XXX,XXX.YY. After
$999.99, a comma is added to separate the
thousands.
A sample file is:
red
$1,000.34
12:01
green
a random line
01:33
01:87
$34.15
4.15
blue
There are two valid times, two dollar amounts, and three
colours. Copy the lines into a file called ex2.txt.
Write a shell script that uses regular expressions and counts the
number of lines with HH:MM time, the number lines with dollar
amounts, and the number lines with a colour. (hint: use three
different regular expressions).
Your script should be called,
count_without_grep.sh. As the name suggests,
this script should not use grep.
ex2.txt should be passed as the first argument
to this script.
Write a script to do the same as above only using
grep (hint: three grep commands are sufficient).
This script should be called
count_with_grep.sh.
A file contains two kind of sentences
The possible toys are: car, truck, ball, or rope. The colours are: red, green, blue, orange, yellow, or brown. The animals are: cat, dog, or human. The verbs are: licks, chases, "picks up", or avoids. There can be one or more spaces between words. There can also be sentences that are different than the above.
The test input file is:
The cat licks the human.
The rope is green.
A random sentence.
The cat is blue.
The dog chases the cat.
The ball is purple.
Write a script called sentence_rec.sh that counts
the two kinds of sentences, and outputs the count. The script
should also echo the line that matches one of the sentence kinds.
The kind of sentence should be identified. The script should be
called with the input file as its only argument.
This exercise makes reference to the words file
from Lab 2. If you don't have this file it can be obtained from
the following respository:
$ git clone https://gitlab.com/COMP2718/lab2_repos.git
Also, you should use the specified variant of
grep for each question.
Find all the lines in words that contain 5
a's, using regular grep (i.e.,
basic regular expressions). abracadabra is one
of the words.
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Find all the lines in words that contain 5
a's, using extended regular expressions. That
is, use grep -E. Your answer should shorter than
the previous question.
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Count the number of lines in words that
contain at least 4 e's and at most 5
e's, using extended grep -E.
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Count the number of lines in words that
contain exactly 3 letters where the middle letter is a vowel
(a, e, i, o, u) using grep (i.e. basic regular
expressions).
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Count the number lines in words that that
start with t and contain the sequence
ae or ea. using grep
-E.
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The last exercise can not be solved with basic regular
expression (why?). Instead two greps,
sort and uniq and wc
can be combined in a pipeline to solve the problem. Combine
the greps with (grep xy words; grep yx
words) so that their standard outputs are combined.
What is the pipeline?
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