Working with Linux

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PNG images usually take more space than JPEG images. If you don't have transparency, it isrecommended to use .jpg. In order to convert from one type to the other, we use the imagemagickconvert command with two parameters: input filename and output filename:convert file.png file.jpg
The format of the output image will be deduced by convert from the filename extension. As you cansee, the output is a JPEG image with the same resolution, but with a much smaller size than the PNGversion: 180 KB compared to 2.6 MB. If we open the image, we can't see any noticeable differences.This is a big thing when it comes to web development, because if we were to use this picture on aweb page, it would load as much as 15 times faster than the PNG version.If we want to crop a region of the image, we can do that with convert. For example, if we want tocut a 500x500 piece of the image, starting at coordinates 100,100, we would use the following:convert -crop "500x500+100+100" warty-final-ubuntu.png warty.jpg
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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
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This will delete everything from li
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cat lorem.txt | tr " " "\n" | grep
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When Vim splits the screen, it open
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Plugin steroids for VimIn this sect
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As we can see, before installing sn
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Here we can see all the snippets av
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A page describing the different enc
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It also has the benefit that it's s
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Using heredocs is a common techniqu
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Sed - one-liner productivity treasu
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If we check the content of the file
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As you can see, the text was update
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You can run, but you can't hide…
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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 and 162: Network - Who's listening?When work
Page 163 and 164: Other useful information we get fro
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: The first and most important part o
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
Page 212 and 213: GitFlow also comes with an enhanced
Page 214 and 215: Analyzing the git hooks directory,
Page 216 and 217: Merging Git conflicts with easeNow
Page 218 and 219: After this, we can run the followin
Page 220: Now we can easily see the two files
Page 223 and 224: In general, most modern IDEs offer
Page 225 and 226: Now do a rehash and type the follow
Page 227 and 228: Click on the link provided by ngrok
Page 229 and 230: JSON jamming in the new ageNowadays
Page 231 and 232: If we want to grab the request meth
Page 233 and 234: If we want to use the output as inp
Page 235 and 236: Say, for example, if we want to cal
Page 237 and 238: Since that the syntax for accessing
Page 239 and 240: To skip printing empty bodies, we c
Page 241 and 242: 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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Working with Linux

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