$var | system()

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

Is there a way to print a variable to a system() command.
Something like this (pseudo code) :

$x = "..multiline text..";
print qx{ echo $x | mail -s '123' email@at.com};
[download]

I don't want to capture the output of a cmd, but rather pipe multiline text to a command.

Comment on $var \| system() Download Code

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Re: $var \| system() by kennethk (Abbot) on Sep 05, 2012 at 16:34 UTC
If by "multiline text" you mean feed it input via STDIN, you can explicitly open a pipe using open, e.g. `open my $stream, "\| mail -s '123' email\@at.com" or die "pipe fail: $! +"; print $stream $text; # Or @lines, or $line1, $line2... close $stream; # Handle needs to close or go out of scope to clear buf +fer and send EOF` [download] There are a large number of other possibilities here, depending on how complex you want to get: system; pipe, fork and exec; IPC::Open2; IPC::Open3... See perlipc for some gory detail. #11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.	[reply] [d/l]
Re: $var \| system() by choroba (Cardinal) on Sep 05, 2012 at 16:04 UTC
If the text does not contain single quotes, you can just quote it: `my $x = "..multiline\ntext.."; print qx{ echo '$x' \| sed 's/^/> /'};` [download] For more complicated strings, you can use `my $x = qq(..multiline\ntext.."'); open my $CMD, '\|-', q{sed 's/^/> /'} or die $!; print {$CMD} $x; close $CMD;` [download] لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ	[reply] [d/l] [select]

Replies are listed 'Best First'.
Re: $var \| system() by kennethk (Abbot) on Sep 05, 2012 at 16:34 UTC
If by "multiline text" you mean feed it input via STDIN, you can explicitly open a pipe using open, e.g. `open my $stream, "\| mail -s '123' email\@at.com" or die "pipe fail: $! +"; print $stream $text; # Or @lines, or $line1, $line2... close $stream; # Handle needs to close or go out of scope to clear buf +fer and send EOF` [download] There are a large number of other possibilities here, depending on how complex you want to get: system; pipe, fork and exec; IPC::Open2; IPC::Open3... See perlipc for some gory detail. #11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.	[reply] [d/l]
Re: $var \| system() by choroba (Cardinal) on Sep 05, 2012 at 16:04 UTC
If the text does not contain single quotes, you can just quote it: `my $x = "..multiline\ntext.."; print qx{ echo '$x' \| sed 's/^/> /'};` [download] For more complicated strings, you can use `my $x = qq(..multiline\ntext.."'); open my $CMD, '\|-', q{sed 's/^/> /'} or die $!; print {$CMD} $x; close $CMD;` [download] لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ	[reply] [d/l] [select]