User:Neoksaal/Tutorials/BASH

Command line basics

pwd outputs the name of the current working directory.
ls lists all files and directories in the working directory.
cd switches you into the directory you specify.
mkdir creates a new directory in the working directory.
touch creates a new file inside the working directory.
cat show you immediately what's inside the file

Helper commands to make navigation easier:

clear clears the terminal
tab autocompletes the name of a file or directory
↑ and ↓ allow you to cycle through previous commands
ls -a lists all contents of a directory, including hidden files and directories
ls -l lists all contents in long format
ls -t orders files and directories by the time they were last modified
Multiple options can be used together, like ls -alt

From the command line, you can also copy, move, and remove files and directories:

cp copies files
mv moves and renames files
rm removes files
rm -r removes directories
rm -rf  adding -f removes all the files without having to confirm

Redirection + other commands are powerful when combined with redirection commands:

> redirects standard output of a command to a file, overwriting previous content.
>> redirects standard output of a command to a file, appending new content to old content.
< redirects standard input to a command.
| redirects standard output of a command to another command.

sort sorts lines of text alphabetically.
uniq filters duplicate, adjacent lines of text.
grep searches for a text pattern and outputs it.
sed searches for a text pattern, modifies it, and outputs it.

wget

if the local computer doesn't have wget
$ brew install wget

$ cd (folder you want to scrape data into)
$ wget -r (url)