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Full Discussion: Bash Question: HowTo Exit Script with User Input While Process is Running Mid-Loop?
Top Forums Shell Programming and Scripting Bash Question: HowTo Exit Script with User Input While Process is Running Mid-Loop? Post 302891284 by hilltop_yodeler on Tuesday 4th of March 2014 06:48:56 PM
Old 03-04-2014
Bash Question: HowTo Exit Script with User Input While Process is Running Mid-Loop?
Hi, I have written a script that allows me to repetitively play a music file $N times, which is specified through user input. However, if I want to exit the script before it has finished looping $N times, if I use CTRL+c, I have to CTRL+c however many times are left in order to complete the loop. For instance, if I specified that the song is to repeat 5 times, if during the first iteration through the loop, if I use CTRL+c to exit the script, I will have to press CTRL+c four more times before the script will terminate.

My objective is to be able to type 'q' or some character in order to quit the process. I have found limited information about this topic online, and what I have found has not worked for me.

Although my script provides more options than what is listed below, here it is in its most basic form (note - I'm using mplayer to play the audio file):

Code:
#!/bin/bash

echo -n "Enter the name of the song that you would like to play: "
read fileName
echo ""

echo -n "How many times would you like to repeat the song? "
read num
echo ""

for ((i=1; i<= $num; i++))
    do mplayer $fileName
done

Does anyone have any recommendations on how I can exit from the script using keyboard input in such a way that I'm not stuck in the loop and that the script actually terminates?

Thank you!
 

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LEARN ABOUT MOJAVE

jrunscript

jrunscript(1)						      General Commands Manual						     jrunscript(1)

NAME

       jrunscript - command line script shell

SYNOPSIS

       jrunscript [ options ] [ arguments... ]

PARAMETERS

       options
	  Options, if used, should follow immediately after the command name.

       arguments
	  Arguments, if used, should follow immediately after options or command name.

DESCRIPTION

       jrunscript  is  a command line script shell. jrunscript supports both an interactive (read-eval-print) mode and a batch (-f option) mode of
       script execution. This is a scripting language independent shell. By default, JavaScript is the language used, but the  -l  option  can	be
       used  to  specify  a  different	language.  Through Java to scripting language communication, jrunscript supports "exploratory programming"
       style.

       NOTE: This tool is experimental and may not be available in future versions of the JDK.

OPTIONS

       -classpath path
	  Specify where to find the user's .class files that are accessed by the script.

       -cp path
	  This is a synonym for -classpath path

       -Dname=value
	  Set a Java system property.

       -Jflag
	  Pass flag directly to the Java virtual machine on which jrunscript is run.

       -l language
	  Use the specified scripting language. By default, JavaScript is used. Note that to use other scripting languages, you also need to spec-
	  ify the corresponding script engine's jar file using -cp or -classpath option.

       -e script
	  Evaluate the given script. This option can be used to run "one liner" scripts specified completely on the command line.

       -encoding encoding
	  Specify the character encoding used while reading script files.

       -f script-file
	  Evaluate the given script file (batch mode).

       -f -
	  Read and evaluate a script from standard input (interactive mode).

       -help
	  Output help message and exit.

       -?
	  Output help message and exit.

       -q
	  List all script engines available and exit.

ARGUMENTS

       If  [arguments...] are present and if no -e or -f option is used, then the first argument is the script file and the rest of the arguments,
       if any, are passed as script arguments. If [arguments..] and -e or -f option are used, then all [arguments..] are passed  as  script  argu-
       ments.  If [arguments..], -e and -f are missing, interactive mode is used. Script arguments are available to a script in an engine variable
       named "arguments" of type String array.

EXAMPLES

       Executing inline scripts

	  jrunscript -e "print('hello world')"
	  jrunscript -e "cat('http://java.sun.com')"

       Use specified language and evaluate given script file

	  jrunscript -l js -f test.js

       Interactive mode

	  jrunscript
	  js>print('hello world');
	  hello world
	  js>34 + 55
	  89
	  js> thread(function() { print('hello world'); }
	  hello world
	  js>

       Run script file with script arguments

	  jrunscript test.js arg1 arg2 arg3

       test.js is script file to execute and arg1, arg2 and arg3 are passed to script as script arguments. Script can access  these  using  "argu-
       ments" array.

SEE ALSO

       If JavaScript is used, then before evaluating any user defined script, jrunscript initializes certain built-in functions and objects. These
       JavaScript built-ins are documented in jsdocs.

								    06 Aug 2006 						     jrunscript(1)
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