Useful commands: Difference between revisions
a few commands 2 get u started |
navigation, paths, pipes, and more |
||
| Line 2: | Line 2: | ||
== by category == | == by category == | ||
=== navigation === | |||
{| class="wikitable" | |||
|- | |||
! command !! example !! description | |||
|- | |||
| <code>cd</code> || <code>cd [[#paths|../]]folder/subfolder</code> || '''c'''hange '''d'''irectory from one folder to another | |||
|- | |||
| <code>ls</code> || <code>ls</code> || '''l'''i'''s'''t the contents of a folder | |||
|- | |||
| <code>pwd</code> || <code>pwd</code> || '''p'''rint the full '''w'''orking '''d'''irectory you're currently in | |||
|} | |||
=== media === | === media === | ||
{| class="wikitable" | {| class="wikitable" | ||
| Line 13: | Line 25: | ||
| <code>yt-dlp</code> || <code>yt-dlp <nowiki>https://youtu.be/INa_SYywZis</nowiki></code> || download videos & audio from [[YouTube]] and [[List of Platforms that pronounmail.com has Outlived|other platforms]] | | <code>yt-dlp</code> || <code>yt-dlp <nowiki>https://youtu.be/INa_SYywZis</nowiki></code> || download videos & audio from [[YouTube]] and [[List of Platforms that pronounmail.com has Outlived|other platforms]] | ||
|} | |} | ||
=== text === | === text === | ||
{| class="wikitable" | {| class="wikitable" | ||
| Line 84: | Line 97: | ||
| <code>man</code> || <code>man git</code> || command usage details | | <code>man</code> || <code>man git</code> || command usage details | ||
|} | |} | ||
== funky things you can do in the shell == | |||
some of the things you can do in the shell even without commands | |||
=== put stuff in a file === | |||
If you want to take the stuff a command is printing out and instead of printing it out, put it in a file, you can use the <code>></code> symbol. For example, if you wanted to take the last line of a long file and copy it to another file you could do: | |||
<code>tail -n 1 long_file.txt > last_line.txt</code> | |||
Just one <code>></code> will overwrite the file if it already exists. If you use two like this <code>>></code> it will append stuff to the end of the file if it already exists. | |||
=== chain commands together === | |||
There's a really powerful feature of the shell called "piping" that lets you chain multiple small commands together to do something more complex. You can use the <code>|</code> character for this. For example, if you have a command that prints out a lot of stuff, you can trim it to the last 50 lines and then search for the text "keyword" by chaining commands together like this: | |||
<code>cat long_file.txt | tail -n 50 | grep "keyword"</code> | |||
== paths == | |||
Every file on a computer has a ''path'' which is how you get there. Imagine we had some folders like this and you're currently hanging out in '''/home/me/folderA''' | |||
{| | |||
|- | |||
| '''/''' | |||
|- | |||
| ↳ || '''home''' | |||
|- | |||
| || ↳ || '''me''' | |||
|- | |||
|colspan="2"| || ↳ || '''folderA''' | |||
|- | |||
|colspan="3"| || ↳ || file1.txt | |||
|- | |||
|colspan="3"| || ↳ || file2.txt | |||
|- | |||
|colspan="2"| || ↳ || folderB | |||
|- | |||
|colspan="3"| || ↳ || file3.txt | |||
|} | |||
Imagine you wanted to print out the contents of '''file3.txt''', there's a few ways you could do this: | |||
<code>cat /home/me/folderB/file3.txt</code> – use the full ''absolute'' path | |||
<code>cat ../folderB/file3.txt</code> – use a path ''relative'' to <code>..</code> the ''parent directory'' right above your current folder which right now, happens to be '''/home/me''' | |||
<code>cat ~/folderB/file3.txt</code> – use a path ''relative'' to <code>~</code> your ''home directory'' which for the user '''me''' will always be '''/home/me''' | |||
[[Category:Pages with some amount of information in them]] | [[Category:Pages with some amount of information in them]] | ||