Working with Linux

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default Ubuntu desktop installation, which is port 53. We can look this up in the special file/etc/services. This file contains all basic port numbers for programs and protocols. We see hereport 53 is the DNS server:Just by analyzing the output, we cannot determine which program is listening on this port, because thisprocess is not owned by our current user. That's why the PID/Program Name column is empty. If werun the same command again with sudo, we see that this process is named dnsmasq and, if we wantmore information, we can look it up in the man page. It's a lightweight DHCP and caching DNSserver:
Other useful information we get from this command:The program protocol, in this case dhcp.Total bytes not copied.Total bytes not acknowledged.Local and foreign address and port. Getting the port is the main reason we are using thiscommand. This is also important for determining if the port is open just on localhost or if it'slistening for incoming connections on the network.The state of the port. Usually this is LISTEN.The PID and program name, which helps us identify which program is listening on what port.Now, if we run a program that is supposed to be listening on a certain port and we don't know if it'sworking, we can find out with netstat. Let's open the most basic HTTP server by running thecommand:python -m SimpleHTTPServer
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Working with Linux - Quick Hacks fo
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Network - Who's listening?Autoenv -
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Working with Linux - Quick Hacks fo
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Melwyn DsaCover WorkMelwyn Dsa
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www.PacktPub.com
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Why subscribe?Fully searchable acro
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PrefaceOur mission is to save Linux
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What you need for this bookIdeally,
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ConventionsIn this book, you will f
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Customer supportNow that you are th
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PiracyPiracy of copyrighted materia
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Chapter 1. IntroductionThis book is
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Terminator - the ultimate terminalT
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Preferences menuIt's an customizing
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And voila! This is our newly config
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Ctrl + Shift + E for a vertical spl
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Text zoom: Ctrl + + and Ctrl + -
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Guake - not Quake!Terminator works
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I believe you can guess what this d
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We can use Guake in full screen by
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The tool is automatically added to
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For example, we might want to updat
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With ClipIt, you can copy and paste
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Vim is renowned for its exotic keyb
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Press the Insert key again to go to
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productive in the coolest terminal
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instructions for installing the oh-
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Let's create a file, say readme.md.
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You can now see the branch name in
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History navigation: Click on arrow
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To see a list of shortcuts, run the
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joe is the string we are searching
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If we don't know exactly what chara
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To find all the lines that have onl
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This will replace every occurrence
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Pipes and subshells - your shell's
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"df -h": This shows the disk usage
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ps aux: This prints all processes w
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cat lorem.txt| tr " " "\n": Transfo
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imagination and how well you learn
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As you can see, the value test is p
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In our case, we will be selecting f
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esacdoneecho "invalid option"exit 1
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./script.sh --ip wlp3s0We can see t
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This way we can start the script, w
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Shell scripting librariesTo really
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of the current working directory (o
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case ${CMD} inpublicip)print_public
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Supercharging VimLet's start by ope
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Let's choose desert!
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We can do the same thing for xml fi
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Keyboard kung fuNow that we have Vi
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Other handy shortcuts are:G: Go to
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:1,$s/CWD/DIR/g:1,$ - start from li
Page 112 and 113: This will delete everything from li
Page 114: cat lorem.txt | tr " " "\n" | grep
Page 117 and 118: When Vim splits the screen, it open
Page 119 and 120: Plugin steroids for VimIn this sect
Page 121 and 122: As we can see, before installing sn
Page 123 and 124: Here we can see all the snippets av
Page 125 and 126: A page describing the different enc
Page 127 and 128: It also has the benefit that it's s
Page 129 and 130: Using heredocs is a common techniqu
Page 131 and 132: Sed - one-liner productivity treasu
Page 133 and 134: If we check the content of the file
Page 135 and 136: As you can see, the text was update
Page 137 and 138: You can run, but you can't hide…
Page 139 and 140: You see here that both readme.md an
Page 141 and 142: You can see here all files that don
Page 143 and 144: Find can also locate files based on
Page 145 and 146: A good folder to search is ~/.local
Page 147 and 148: As we can see, electron has a few e
Page 149 and 150: In order to do this, we combine fin
Page 151 and 152: tmux - virtual consoles, background
Page 153 and 154: For demonstration purposes, we will
Page 155 and 156: This will kill the running session.
Page 157 and 158: You also have the possibility to cr
Page 159 and 160: Ctrl + b &: delete
Page 161: Network - Who's listening?When work
Page 165 and 166: You can quickly understand the form
Page 167 and 168: As you can see, there is again the
Page 169 and 170: non-standard. To actually connect t
Page 171 and 172: hostnames and ports. For a deeper u
Page 173 and 174: Now let's do the same thing for pro
Page 175 and 176: autoenv: Are you sure you want to a
Page 177 and 178: export environment=devexport versio
Page 179 and 180: Autoenv can really come in handy, a
Page 181 and 182: Let's assume we don't need the file
Page 183 and 184: It will show us a list of options a
Page 185 and 186: Chapter 5. Developers' TreasureIn t
Page 187 and 188: Clicking on the button generates a
Page 189 and 190: You can find the files used in this
Page 191 and 192: The first and most important part o
Page 193 and 194: The format of the output image will
Page 195 and 196: This will create a JPEG image with
Page 197 and 198: Let's try to shrink the large PNG i
Page 200 and 201: Alright, now let's try and do the s
Page 202 and 203: Go with the Git flowGit is by far t
Page 204 and 205: We can see that we are now on the d
Page 206 and 207: This command will tell us that we h
Page 208 and 209: This switches us over to our releas
Page 210 and 211: We see that the only two available
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GitFlow also comes with an enhanced
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Analyzing the git hooks directory,
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Merging Git conflicts with easeNow
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After this, we can run the followin
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Now we can easily see the two files
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In general, most modern IDEs offer
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Now do a rehash and type the follow
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Click on the link provided by ngrok
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JSON jamming in the new ageNowadays
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If we want to grab the request meth
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If we want to use the output as inp
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Say, for example, if we want to cal
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Since that the syntax for accessing
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To skip printing empty bodies, we c
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We can even perform arithmetic oper
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There we can see an example of cons
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This will send gedit to the backgro
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Now we see that the mouse pointer h
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Chapter 6. Terminal ArtAll work and
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To make this recurrent, we can incl
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Now, with our newly learned skills,
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Let your friends be amazed by the c
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IndexAautoenvabout / Autoenv - Set
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Ddesert / Color scheme desertdigabo
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Ffind commandusing / You can run, b
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Iidentify / Shrinking spells and ot
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LlinuxURL, for developers / Are you
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NNERDtreeabout / Plugin steroids fo
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PpathogenURL / Plugin steroids for
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Ssedone-liner productivity / Sed -
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VVimsupercharging / Supercharging V
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