Filters in Unix Question

Find string2

Question:

Display the lines from the file teknoscript.txt  that  do not contain the string lin.

Code:

findstring2.sh

grep -v lin teknoscript.txt

Find string 3

Question:

Display the lines from the file teknoscript.txt  that contain the string “lin” along with its line numbers. 

Code:

findstring3.sh

grep -n lin teknoscript.txt

Find string 5

Question:

Display the lines from the file teknoscript.txt  that end with h.

Code:

findstring5.sh

grep 'h$' teknoscript.txt 

Find string 7

Question:

Use the grep command to display all lines in teknoscript.txt  that start with echo.

Code:

findstring7.sh

grep ^echo teknoscript.txt

Find string 8

Question:

Which command will display the lines in the file teknoscript.txt  that are not comment lines( #)?

Code:

findstring8.sh

grep -v ^# teknoscript.txt

Grep Command – 2

Question:

Write a command to list all the lines from the file “employee.txt” which does not end with semicolon.

Code:

cmd5.sh

grep -v ';$' employee.txt

Grep Command – 3

Question:

Write a command to list all the lines from the file “employee.txt” ending with colon.

Code:

cmd9.sh

grep ':$' employee.txt

Tail Command – 2

Question:

Write a command to display the last 3 lines from the given file “sample.txt”.

Code:

cmd6.sh

tail -n 3 sample.txt

Redirect Command – 2

Question:

Write a command to redirect the number of lines of a file “input.txt” to the file “output.txt”.

Code:

cmd10.sh

wc -l "input.txt">"output.txt"

Count Files

Question:

Write a command to count the total number of files and sub directories in the current directory.     

Code:

cmd7.sh

ls -r | wc -l
./ -type -f -print | wc -l

List Files

Question:

What is the command to list all the files/directories having “s” as the first character from the current directory?

Code:

cmd11.sh

 ls | grep '^s'

Word Search

Question:

Write a command to display all the lines which contains the word “Birbal” from a file “story.txt”. The search should not be case sensitive( “Birbal”, “BirBal”, “BIRBAL” etc.).

Code:

cmd8.sh

grep -i "Birbal" story.txt

Pattern Search

Question:

Write a command to list all the files and directories in the current directory whose second character is a digit.

Code:

cmd12.sh

ls -d ./?[0-9]*

Recommended:

1. All programs of Introduction to Unix
2. All programs of File System
3. All Programs of Filters
4. All Programs of Bourne Shell