• Q1a - Remove empty lines
• Q2a - Remove duplicates

For Q1a we were given a file quotes.txt on which we had to perform operations and remove duplicate lines

Command used:

grep . quotes.txt

This command prints the output in the terminal with only the lines which have some content and that's why blank lines aren't printed and we were successfully able to remove emoty lines from quotes.txt

Quotes.txt conatined many duplicate lines and in this que we were supposed to remove duplicates line from it.

Command used:

awk '!a[$0]++' quotes.txt

This command prints the output in the terminal and remove duplicates line from a file which can be done easily by using the awk command as showm:

Command used:

awk -F~ '{ print $2 " once said, \""$1"\"" }' quotes.txt > speech.txt

awk command with -F, sets the field seperator, FS, to value.

Read the string before ~ sign and after it, then transform the line.

For eg.

Read any file as input and perform follwing using one shell script lines

• Print the Size of file in bytes
• Count total number of lines in the file
• Count total number of Words in the file
• Count words in each line and print Line No: <> - Count of Words:
• Provide of the list of repeated works and number of times they are repeated. Print as Word: <> - Count of repetition: []

Print the size of file in bytes

Command Used:

#!/bin/bash

filepath=$1

size=$(wc --bytes < $filepath)

echo "The size of the file $1 is $size Bytes"

It will print the the size of the given file in bytes using the wc --bytes

Count total number of lines in the file

Command Used:

#!/bin/bash

filepath=$1

number_of_lines=$(wc --lines < $filepath)

echo "Number of Lines in the file $filepath is $number_of_lines"

It will print the total no. of lines in the given file using the wc --lines

Count total number of words in the file

Command Used:

#!/bin/bash

filepath=$1

number_of_words=$(wc --word < $filepath)

echo "Number of words in $filepath is $number_of_words"

It will print the total no. of words in the given file using the wc --word

Count words in each line and print Line No: <> - Count of Words:

Command Used:

#!/bin/bash

filepath=$1

awk '$0="Line No: "NR" - Count of Words "NF' $filepath 

This command prints the line no. along with the number of words in that respective line
For eg. Line No: __ - __

Provide the list of repeated words and the no. of times they are repeated

Command used:

#!/bin/bash

cat $1 | tr " " "\n" | tr -cd '[:alnum:]\n'"'" | sort | uniq -cd | awk '{print $2 " - " $1}'

Prints the list of repeated words with no. of times they are repated.

Write a logic to sort input data using arrays and conditional statements.

Sample Input:

21,22,34,1,7,90,101,2,4,8,45

Command used:

#!/bin/bash

IFS=','
read -r -a nos
let n=${#nos[@]}
for (( i = 0; i < $n ; i++ ))
do
for (( j = $i; j < $n; j++ ))
do
if [ ${nos[$i]} -gt ${nos[$j]}  ]; 
then
t=${nos[$i]}
nos[$i]=${nos[$j]}
nos[$j]=$t
fi
done
done

for (( i=0; i < $n; i++ ))
do
echo -n ${nos[$i]}" "
done
echo

Using bubble sort we sorted the sample inputs and printed them on cmd.

Print the string in reverse

#!/bin/bash

str="$1"
reversed_string=""

len=${#str}

for (( i=$len-1; i>=0; i-- ))
do
   reversed_string="$reversed_string${str:$i:1}"
done
echo "$reversed_string"

replace letters in the reverse output with subsequent letter

#!/bin/bash

str="$1"
len=${#str}
for((i=$len-1;i>=0;i--))
do
     reverse="$reverse${str:$i:1}"
done
final=$reverse

letter2='z'

for letter in {y..a}
do
final=${final//[$letter]/$letter2}
letter2=$(tr 1-9a-zA-Z 0-9a-zA-Y <<<"$letter2")
done
echo $final

Read the String as Input and print only the half string in reverse.

#!/bin/bash

str="$1"
len=${#str}
for((i=$len/2-1;i>=0;i--))
do
     reverse="$reverse${str:$i:1}"
done
for((i=$len/2;i<len;i++))
do
     reverse="$reverse${str:$i:1}"
done
echo $reverse

To execute a shell file open the terminal using

CTRL + ALT + T

Navigate to the directory with sh files

USE:

./Q1a.sh
./Q1b.sh

./Q2.sh

./Q3a.sh
./Q3b.sh
./Q3c.sh
./Q3d.sh
./Q3e.sh

./Q4.sh

./Q5a.sh
./Q5b.sh
./Q5c.sh

If you do not have permission to execute the sh file

USE:

chmod +x Q1.sh and then use ./Q1a.sh

Basically it gives execute permission (chmod) using +x

https://github.com/theramandeep04/ISS-Assignment-1-