Advanced Unix programming (SAMS) by Gay W. PDF

By Gay W.

This can be a e-book approximately UNIX programming. It starts off with uncomplicated ideas and ends with assurance of complicated subject matters. it's a self-teaching advisor, and but it capabilities as a UNIX reference booklet. The examples supplied are written within the C and C++ languages. The examples are brief courses, each one meant to illustrate use of a selected programming facility. The C++ courses are written as easy courses and may be good understood by means of those who don't software in C++. This publication makes an attempt to be UNIX platform impartial. in the course of the booklet, transformations in performance are famous to your comfort. it will prevent time if you needs to write initiatives that needs to be UNIX moveable. FreeBSD 3.4 free up is used all through this e-book for demonstration reasons. This promises that the instance courses will assemble and run with none extra attempt on that platform. This additionally supplies a selected point of performance, seeing that a few features are missing or range on different structures. you could receive FreeBSD from the net or buy it on a CD-ROM at a nominal price. this lets you paintings throughout the booklet on a platform that's on a par with different specialist UNIX systems.

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Usr/bin/env bash # cookbook filename: interactive case "$-" in *i*) # Code for interactive shell here ;; *) # Code for non-interactive shell here ;; esac Discussion $- is a string listing of all the current shell option flags. It will contain i if the shell is interactive. 9 Setting bash As Your Default Shell Problem You’re using a BSD system, Solaris, or some other Unix variant for which bash isn’t the default shell. You’re tired of starting bash explicitly all the time, and want to make bash your default shell.

Solution Use the type and which commands to see if a given command exists and whether it is built-in or external. # type cd cd is a shell builtin # type awk awk is /bin/awk Using or Replacing Built-ins and External Commands | 13 # which cd /usr/bin/which: no cd in (/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/ sbin:/usr/bin/X11:/usr/X11R6/bin:/root/bin) # which awk /bin/awk Discussion A built-in command is just that; it is built into the shell itself, while an external command is an external file launched by the shell.

Also consider a command such as svn -v log | less. If less exits before Subversion has finished sending data, you’ll get an error like “svn: Write error: Broken pipe”. While it isn’t pretty, it also isn’t harmful. It happens all the time when you pipe some a voluminous amount of data into a program like less—you often want to quit once you’ve found what you’re looking for, even if there is more data coming down the pipe. awk | wc How can you see what is happening between uniq and awk without disrupting the pipe?

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