How to include \ in a variable?

chuckycharms has asked for the wisdom of the Perl Monks concerning the following question:

I know this is a super noob question, but cant figure it out. I need this:

$goodtxt = "asterisk -rx \"celliax_sendsms line0/$word[3] \"Good Passw
+ord\"\"";
system($goodtxt);
[download]

to print out this:

asterisk -rx "celliax_sendsms line0/18157185089 \"your vehicle is now 
+starting\""
[download]

Also I did define $word3, the issue is I dont know how to print the \ into the system command. Any Suggestions?

Comment on How to include \ in a variable? Select or Download Code

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Re: How to include \ in a variable? by desemondo (Hermit) on Jan 28, 2010 at 21:45 UTC
Every time you interpolate something, the `\` characters will get "evaluated" out of the statement or expression (there is probably a better way to say that, but thats the best I can manage this early in the morning...) . The `qq{}` operator allows to you double quote a string without having to use the double quote `"` character. Thus you don't need to escape those particular characters with `\`'s. Try this: `$goodtxt = qq{asterisk -rx "celliax_sendsms line0/$word[3] "Good Passw +ord""};` [download] Update: If you actually want a literal `\` in the output, then you'd need to use a double `\\` . So you might actually want: `$goodtxt = qq{asterisk -rx "celliax_sendsms line0/$word[3] \\"Good Pas +sword\\""};` [download]	[reply] [d/l] [select]
Re: How to include \ in a variable? by toolic (Bishop) on Jan 28, 2010 at 21:47 UTC
Back-whack \\, and also use qq (although, it's not required, but should make it a little easier to read): `$goodtxt = qq(asterisk -rx "celliax_sendsms line0/$word[3] \\"Good Pas +sword\\"");` [download]	[reply] [d/l]
Re: How to include \ in a variable? by ikegami (Patriarch) on Jan 28, 2010 at 22:37 UTC
If you're not on Windows, your best bet is to completely avoid the shell. `system(asterisk => ( -rx => qq{celliax_sendsms line0/$word[3] "Good Password"}, ));` [download]	[reply] [d/l]
Re: How to include \ in a variable? by pileofrogs (Priest) on Jan 28, 2010 at 22:04 UTC
And you can always use single quotes inside of the double-quoted string, side-stepping the problem. `$goodtxt = qq(asterisk -rx "celliax_sendsms line0/$word[3] 'Good Passw +ord'");` [download]	[reply] [d/l]
Re: How to include \ in a variable? by Anonymous Monk on Jan 28, 2010 at 21:46 UTC
`$goodtxt = qq[asterisk -rx "celliax_sendsms line0/$word[3] \\"Good Pas +sword\\""]; die $goodtxt; __END__` [download]	[reply] [d/l]
Re: How to include \ in a variable? by chuckycharms (Initiate) on Jan 28, 2010 at 21:35 UTC
Sorry, the second print out should read: `asterisk -rx "celliax_sendsms line0/18157185089 \"Good Passowrd\""` [download]	[reply] [d/l]