[Day 5] 1. Commands

uname

Command

Purpose: Displays information about the system.
Usage:
- ```
uname
```
  : Shows the name of the operating system.
- ```
uname -r
```
  : Displays the kernel version.
- ```
uname -a
```
  : Displays all available information about the system (OS name, kernel version, hardware platform, etc.).
- SMP: Stands for Symmetric Multi-Processing, which is a method for multiple processors to share the same memory and run processes simultaneously.

rename

Command

Purpose: Allows renaming of multiple files at once. This is useful when the files share something in common (e.g., their extension).
Examples:
- ```
rename "s/file/test/" *.txt
```
  - Meaning: Replaces the word "file" with "test" in all
```
.txt
```
    files.
- ```
rename "s/txt/doc/" *.txt
```
  - Meaning: Changes the extension of all
```
.txt
```
    files to
```
.doc
```
    .

Here , we used

grep

command to check if it is a

directory

or a

file

: !1. Command1.png

In the below figure, when we use cut command: !1. Command2.png