Solved

expect,  using associative arrays

Posted on 2006-06-29
4
2,364 Views
Last Modified: 2012-08-13
Can somebody give me example of using associative arrays within expect script?
I need to create a map from string to string, then access/get value by key.
0
Comment
Question by:ravenpl
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 43

Author Comment

by:ravenpl
ID: 17007769
Also, is there a way to use if/else statement?
0
 
LVL 35

Assisted Solution

by:Duncan Roe
Duncan Roe earned 125 total points
ID: 17008221
All expect arrays are associative. For instance, you might put something like

if {[info exists xarray(fred)]} {<whatever ....>}

This tests if you allocated an array element suffix of fred to the array xarray.

You certainly can use if/else although "else" itself is in fact a "noise" word. You must have Tcl installed for expect to work, so try "man n if" for the full story:

20:22:46$ man n if
if(n)                 Tcl Built-In Commands                 if(n)



_________________________________________________________________________________________________________________________________________________________________________________________________________

NAME
       if - Execute scripts conditionally

SYNOPSIS
       if expr1 ?then? body1 elseif expr2 ?then? body2 elseif ... ?else? ?bodyN?
_________________________________________________________________________________________________________________________________________________________________________________________________________


DESCRIPTION
       The if command evaluates expr1 as an expression (in the same way that expr evaluates its argument).  The value of the expression must be a boolean (a numeric value, where 0 is false and anything
       is true, or a string value such as true or yes for true and false or no for false); if it is true then body1 is executed by passing it to the Tcl interpreter.  Otherwise expr2 is evaluated as an
       expression and if it is true then body2 is executed, and so on.  If none of the expressions evaluates to true then bodyN is executed.  The then and else arguments are optional ``noise words'' to
       make the command easier to read.  There may be any number of elseif clauses, including zero.  BodyN may also be omitted as long as else is omitted too.  The return value from the command is  the
       result of the body script that was executed, or an empty string if none of the expressions was non-zero and there was no bodyN.


KEYWORDS
       boolean, conditional, else, false, if, true



Tcl                                                         if(n)

======================================
Just read the 2nd sentence of your question :-/

Very basically:

set array(string1) <xlate string1>
(same for 2, 3, 4 &c.). Except you'd probably use read or gets to read your table into the array. On a query, you'd use the info exists construct outlined earlier to verify the string is known, and return the translated string if so.
BTW you could use tclsh instead of expect, unless you actually use expect's additional facilities as well.
0
 
LVL 51

Accepted Solution

by:
ahoffmann earned 125 total points
ID: 17013087
array set hash [list a 2 b 3 c 4]
array names hash
puts $hash(b)

# expect is tcl
0
 
LVL 51

Assisted Solution

by:ahoffmann
ahoffmann earned 125 total points
ID: 17013138
if {$hash(b)==3} {puts "yes"} else { puts "no" }
0

Featured Post

Use Filtering Commands to Process Files in Linux

Learn how to manipulate data with the help of various filtering commands such as `cat`, `fmt`, `pr`, and others in Linux.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Have you ever been frustrated by having to click seven times in order to retrieve a small bit of information from the web, always the same seven clicks, scrolling down and down until you reach your target? When you know the benefits of the command l…
The purpose of this article is to fix the unknown display problem in Linux Mint operating system. After installing the OS if you see Display monitor is not recognized then we can install "MESA" utilities to fix this problem or we can install additio…
If you’ve ever visited a web page and noticed a cool font that you really liked the look of, but couldn’t figure out which font it was so that you could use it for your own work, then this video is for you! In this Micro Tutorial, you'll learn yo…
Visualize your data even better in Access queries. Given a date and a value, this lesson shows how to compare that value with the previous value, calculate the difference, and display a circle if the value is the same, an up triangle if it increased…

623 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question