Day-3:Hands-On for Linux Commands
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🔸cat
Used to view what content present in a file
Example: Create a file using 'touch' command & then add the text using 'vim' commad later use 'cat' to know what is written in that file.
🔸chmod
- Used to change access permissions of files
There are 2 methods to change the access,
1) Symbolic/Text Method
2) Numeric Method
The default value for read is 4,write is 2,execute is 1
Example: Here i'm using Numeric method to change file permissions for USER/GROUP/OTHERS
🔸history
- Used to 'check' the commands which are used in the terminal
🔸rmdir
- Used to 'remove' the created or existing directory
🔸touch & cat (example-1)
To create a file we use 'touch' command and for viewing the content for the file we use 'cat'
🔸vim (example-1)
Used to 'add' content in an empty file
Example: Lets create a file named 'devops.txt' and add Apple,Mango,Banana,Cherry,Kiwi,Orange,Guava (one in each line)
Note: While using 'vim' command press 'i' to enter "insert" mode and add the context for the file at last press Escape button then type :wq (write & quit) & Enter to save the file.
🔸head <file name> -n 3
Used to show 'top' 3 text present in a file
Example: Lets use above file to check the response for top 3 values with this command
🔸tail <file name> -n 3
Used to show 'bottom' 3 text present in a file
Example: Lets use above file to check the response for bottom 3 values with this command
🔸touch & cat (example-2)
By using 'touch' command we can create a file and to check the content in the file we will use 'cat' command
Example: Below created an empty file so when using 'cat' command we couldn't see any content stored in that file
🔸vim (example-2)
Used to 'add' content in an empty file
Example: Lets create another file named 'Colors.txt' and add Red,Pink,White,Black,Blue,Orange,Purple,Grey (one in each line)
🔸diff
Used to find difference between any two files
I hope this blog has helped you to uderstand how these commands actually used to in real time scenarios 🚀
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Happy Learning 😊:)
