Sometimes, while working on the command line, you might want to know more about logged in users. There exists a command line utility who which you can use to access this kind of information. In this tutorial, we will discuss the basics of who using some easy to understand examples. But before we do that, it's worth mentioning that all examples here have been tested on Ubuntu 16.04 LTS. As already mentioned, the who command shows who all are logged in.
When downloading files, particularly installation files from websites, it is a good idea to verify that the download is valid. A website will often display a hash value for each file so that you can make sure the download completed correctly. In this article, we will be discussing the md5sum tool that you can use to validate the download. Two other utilities, sha256sum and sha512sum, work the same way as md5sum.
In this tutorial, we will show you how to edit files on the command line. This article covers three command line editors, vi (or vim), nano, and emacs. To edit files on the command line, you can use an editor such as vi. To open the file, runNow you see the contents of the file (if there is any. Please note that the file is created if it does not exist yet.). The most important commands in vi are these:Press i to enter the Insert mode. Now you can type in your text.
Muck Rack makes it simple to find people, tweets, or articles that mention any name, keyword, company, hashtag etc. We've compiled this guide to help you make the most of your search.
Selecting a term
Start searching tweets, articles from media outlets, articles mentioned in tweets, journalists'
names, titles and bios with some suggested searches:
Companies or Topics (e.g. iPhone, Microsoft)
Phrases (e.g. "cloud computing") — use quotes to keep the terms together
Twitter handles (e.g. @username) — returns those who have mentioned or replied to
Names (e.g. "David Pogue")
Hashtags (e.g. #sxsw, #london2012)
Bio details (e.g. vegan, Olympics, father)
Muck Rack's Advanced Search allows for many boolean operators.
Find results that mention multiple specified terms, use AND or
+. For example, ensure each result contains both Elon Musk and Mark Zuckerberg by
searching Musk AND Zuckerberg or Musk + Zuckerberg.
Use the operators OR or , to broaden your search when you'd like either of
multiple terms to appear in results. (This is the default behavior of our search when no operators
are used). For example, results will contain either cake or cookie by searching cake OR cookie or cake,cookie
Use NOT or - to subtract results from your search. For
example, searching Disney will yield results about the Walt Disney Company as well as Walt Disney
World Resort. To exclude mentions of Disney World, search for Disney -World or Disney
When using one of these operators with a phrase, enclose it in quotation marks. For example, you can
find results about smartphones excluding Apple's iPhone 4S by searching smartphone -"iPhone
Exact case matching or punctuation
If you're searching for a brand name or keyword that relies on specific punctuation marks or capitalization, you can
find results that match your exact query by adding matchcase: before the keyword you're searching for, like matchcase:E*TRADE .
Use parentheses to separate multiple
boolean phrases. For example, to find journalists talking about having fun in Disney World or
Disneyland, search for ("disney world" OR disneyland) AND fun.
An asterisk can be used to search for any variation of a root word truncated by the asterisk. For example, searching for admin* will return results for administrator, administration, administer, administered, etc.
A near operator is an AND operator where you can control the distance between the words. You can vary the distance the near operation uses by adding a forward slash and number (between 0-99) such as strawberries NEAR/10 "whipped cream", which means the strawberries must exist within 10 words of "whipped cream".