Basics linux commands

Task 1:To view what's written in a file.

cat file_name   To check what is written in a file.

Task 2:To change the access permissions of files.

The 'chmod' command is used to change the access permissions of files and directories. The name is an abbreviation of change mode.

chmod <options> <mode> <dir/file_name>

There are 3 user classes in the Linux system:

1. owner(rwx)

2. group(rx)

3. other(rx)

The file permissions in Linux are the following three types:

r=Read permission.

w=Write permission.

x=Execute permission.

Values of rwx:

r=4, w=2, x=1

rwx=full permission to file.

chmod 777 <filename>

--- = no permission to file.

Task 3:To check which commands you have run till now.

$ history   To check which commands you have run till now.

Task 4:To remove a directory/ Folder.

$ rm -r <dir/folder_name>  To remove a directory/folder or nested folder.

Task 5:To create a fruits.txt file and view the content.

touch <file_name>     To create a file
echo "Content to be added in file" > file_name  To add content in a file
cat <file_name>    To view the content of any text file.

Task 6: Add content in devops.txt (One in each line) - Apple, Mango, Banana, Cherry, Kiwi, Orange, Guava.

The 'vim' command is used to add content to a file. It can be used to edit all kinds of plain text. It is especially useful for editing programs.

vim devops.txt   To add the content
cat devops.txt   To view the content

Task 7:To Show only the top three fruits from the file.

head -n 3 <filename>  To show top three content in the file

Task 8:To Show only the bottom three fruits from the file.

tail -n 3 <filename>  To show bottom three content in the file

Task 9:To create another file Colors.txt and to view the content.

touch <file_name>     To create a file
echo "Content to be added in file" > file_name  To add content in a file
cat <file_name>    To view the content of any text file.

Task 10:Add content in Colors.txt (One in each line) - Red, Pink, White, Black, Blue, Orange, Purple, Grey.

vim colors.txt   To add the content
cat colors.txt   To view the content

Task 11:To find the difference between fruits.txt and Colors.txt files.

diff <firstfile.txt> <secondfile.txt>

Thank you for reading :)

Priyanka Varshney