Learning Unix for OS X: Going Deep With the Terminal and Shell

Learning Unix for OS X: Going Deep With the Terminal and Shell

Dave Taylor

Language: English

Pages: 238

ISBN: 1491939982

Format: PDF / Kindle (mobi) / ePub

Think your Mac is powerful now? This practical guide shows you how to get much more from your system by tapping into Unix, the robust operating system concealed beneath OS X’s beautiful user interface. OS X puts more than a thousand Unix commands at your fingertips—for finding and managing files, remotely accessing your Mac from other computers, and using freely downloadable open source applications.

If you’re an experienced Mac user, this updated edition teaches you all the basic commands you need to get started with Unix. You’ll soon learn how to gain real control over your system.

  • Get your Mac to do exactly what you want, when you want
  • Make changes to your Mac’s filesystem and directories
  • Use Unix’s find, locate, and grep commands to locate files containing specific information
  • Create unique "super commands" to perform tasks that you specify
  • Run multiple Unix programs and processes at the same time
  • Access remote servers and interact with remote filesystems
  • Install the X Window system and learn the best X11 applications
  • Take advantage of command-line features that let you shorten repetitive tasks

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Programming Windows Store Apps with HTML, CSS and JavaScript

Model-Based Software Testing and Analysis with C#

Automating System Administration with Perl: Tools to Make You More Efficient

Guide to RISC Processors: for Programmers and Engineers




















to the standard output. Pipes are denoted with the | symbol (which can be found above the \ on a standard Apple keyboard layout) and are a method of joining the output of one command to the input of another (in the following example, the output of the ls command to the input of the grep command), flowing data between them just as a plastic pipe transports water from a water main to a sprinkler head in your garden. When grep searches multiple files, it shows the name of the file where it finds

see, I have a lot of web content in my home directory—there are over a thousand files that match the filename pattern *.html. That’s a lot of web pages! Matching by File Size Another primary that can be tested is the file size, using -size. This is a typically complex find primary in that the default unit for specifying size is 512-byte blocks, so -size 10 matches files that are 10*512 bytes, or 5,120 bytes, in size. To match a specific number of bytes, append a c; for example, -size 10c matches

in the book Alice’s Adventures in Wonderland is a simple task: $ tr -cs "[:alpha:]" "\n" < alice.txt | uniq | wc -l 27313 Or is it? That’s not correct, because in this situation, uniq needs to have the input sorted. Add that step and the number changes dramatically: $ tr -cs "[:alpha:]" "\n" < alice.txt | sort | uniq | wc -l 2868 Further, we should also ensure that all the letters are lowercase, so that “Hello” and “hello,” for example, are counted as one word, not two. This can be done by

file transfer programs, which we cover later in this chapter) were designed 20 years ago or more, when networks were friendly places with cooperative users. Those programs (many versions of telnet and rsh, for instance) make a cracker’s job easy. They transmit your data, including your password, across the net‐ work in a way that allows even the most inexperienced cracker to read it. Worse, some of these utilities can be configured to allow access without passwords. SSH is different; it was

original_file (or files) from one location to another. mv original_file new_file Moves a file or files; the original is deleted once the operation is complete. rm filename Removes a file, set of files, or folder(s) full of files. Commands Included with Unix | 9 Use the rm command with caution; there’s no “Trash” to which things are moved. Once you’ve used rm to delete something, it’s gone forever. pwd Displays your present working directory; this is where you currently are in the

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