Download Exploring Expect (Nutshell Handbooks) by Don Libes PDF

By Don Libes

Anticipate is instantly turning into part of each UNIX user's toolbox. It helps you to automate Telnet, FTP, passwd, rlogin, and 1000s of alternative functions that typically require human interplay. utilizing count on to automate those purposes will let you accelerate initiatives and, in lots of situations, clear up new difficulties that you simply by no means could have even thought of prior to. for instance, you should use count on to check interactive courses with out alterations to their interfaces. Or wrap interactive courses with Motif-like front-ends to manage purposes through buttons, scrollbars, and different picture parts with out recompilation of the unique courses. you do not even want the resource code! anticipate works with distant purposes, too. Use it to tie jointly net functions together with Telnet, Archie, FTP, Gopher, and Mosaic. Don Libes is the writer of anticipate in addition to the writer of this booklet. In Exploring anticipate, he offers a complete instructional on all of Expect's beneficial properties, permitting you to place it instantly to paintings in your difficulties. In a down-to-earth and funny kind, he offers a number of examples of demanding real-world purposes and the way they are often computerized utilizing anticipate to save lots of you time and cash. anticipate is the 1st of a brand new breed of courses in response to Tcl, the instrument Command Language that's rocking the pc technological know-how group. This publication presents an advent to Tcl and describes how count on applies Tcl's strength to the hot box of interplay automation. no matter if your curiosity is in anticipate or interplay automation otherwise you easily are looking to know about Tcl and spot the way it has been utilized in genuine software program, you'll find Exploring count on a treasure trove of easy-to-understand and priceless details.

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The default is 1 (the calling procedure). If an integer is preceded by a "#", then the level is an absolute level with 0 equivalent to the global level. For example, the following associates the global variable curved_intersection_count with the local variable x. upvar #0 curved_intersection_count x The upvar command is especially useful for dealing with arrays because arrays cannot be passed by value. ) However, arrays can be passed by reference. For example, imagine you want to compute the distance between two points in an xyzcoordinate system.

The default is 1 (the calling procedure). If an integer is preceded by a "#", then the level is an absolute level with 0 equivalent to the global level. For example, the following associates the global variable curved_intersection_count with the local variable x. upvar #0 curved_intersection_count x The upvar command is especially useful for dealing with arrays because arrays cannot be passed by value. ) However, arrays can be passed by reference. For example, imagine you want to compute the distance between two points in an xyzcoordinate system.

A pipe character ("|") signifies that the remainder of the argument is a command. For example, the following command searches through all the files in the current directory hierarchy and finds each occurrence of the word book. Each matching occurrence can be read as if you were reading it from a plain file. open "| find . -type f -print | xargs grep book" The argument to open must be a valid list. Each element in the list becomes a command or argument in the pipeline.

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