[LINUX] Command memorandum

Linux From ** ubuntu ** to ** Raspberry Pi OS (Raspbian) **. By the way, ** Mac OS ** is UNIX. Nowadays, there are various distributions of `` `Linux, but it was originally developed by Linus Torvalds in 1991 with reference to UNIX```.

curl ** Command to transfer data from or to the server **. You can use curl to do POST and DELETE, and read Session from cookies.

curl <option> <url>

reference Curl command usage memo [Hit api with curl command](https://qiita.com/buntafujikawa/items/758425773b2239feb9a7#:~:text=curl%E3%82%B3%E3%83%9E%E3%83%B3%E3% 83% 89% E3% 81% A8% E3% 81% AF% E3% 82% B5% E3% 83% BC% E3% 83% 90,% E3% 81% 84% E3% 82% 8B% E3% 82 % 8F% E3% 81% 91% E3% 81% A7% E3% 81% AF% E3% 81% AA% E3% 81% 84% E3% 81% A7% E3% 81% 99% E3% 80% 82 & text = curl% E3% 82% B3% E3% 83% 9E% E3% 83% B3% E3% 83% 89% E8% 87% AA% E4% BD% 93% E3% 81% AFFTP,% E3% 81% AB% E5% AF% BE% E5% BF% 9C% E3% 81% 97% E3% 81% A6% E3% 81% 84% E3% 81% BE% E3% 81% 99% E3% 80% 82)

touch ** Command to change the last modified date of a file **. The time executed with "touch file name" is the last modified date of the file. Also, create a new file.

touch <option> <file>

tree ** Command to display the directory structure under the current directory **


pwd ** Command to display the path to the current directory **


echo ** Display character strings, numbers, and variables on the screen **.

echo <Character strings / variables to be displayed>

reboot restart

sudo reboot

Windows It's very different from the Windows command Linux. Also, `Windows``` has a longer development history than `` Linux```.

In addition, the share of OS for PC in the world is ** about 77% ** for `Windows```, ** about 18% ** for macOS```, and ``` Linux```. ** 2% **, ``` Chrome OS `` ** about 1% **, overwhelmingly Windows.

You can check various statistical information at the following sites.

reference Desktop Operating System Market Share Worldwide

dir ** Refer to the contents of the current directory **


call ** Command to start batch file from batch file. **

nul Create a new file. Equivalent to Linux `` `touch```.

type nul > <File to create>

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