Can I execute a multiline command in Perl's backticks?

Question

In Unix, I have a process that I want to run using nohup. However this process will at some point wait at a prompt where I have to enter yes or no for it to continue. So far, in Unix I have been doing the following

nohup myprocess <<EOF
y
EOF

So I start the process 'myprocess' using nohup and pipe in a file with 'y' then close the file. The lines above are effectively three seperate commands - i.e. I hit enter on the first line in UNIX, then I get a prompt where I enter 'y' and then press enter to then finally type 'EOF' and hit return again.

I want to know execute this in Perl but I am not sure how I can execute this command as it is over three lines. I don't know if the following will work....

my $startprocess = `nohup myprocess <<EOF &
y
EOF
`

Please help - thank you!

Perhaps the Unix & Linux stackexchange could help: http://unix.stackexchange.com/ — oadams, Oct 01 '10 at 04:02
When you don't know if something will work, write a small test program and find out. :) — brian d foy, Oct 01 '10 at 17:34

score 5 · Answer 1 · edited May 23 '17 at 12:32

5

I think your proposal will work as is. If not, try replacing the redirect with a pipe:

my $startprocess = `(echo "y" | nohup myprocess) &`;

Also, depending on WHY you are doing a nohup, please look at the following pure Perl daemonizing approach using Proc::Daemon : How can I run a Perl script as a system daemon in linux?

edited May 23 '17 at 12:32

Community

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answered Oct 01 '10 at 01:15

DVK

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score 2 · Answer 2 · answered Oct 01 '10 at 01:29

2

Expect for interactive programs can be used as well.

answered Oct 01 '10 at 01:29

Alan Haggai Alavi

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Can I execute a multiline command in Perl's backticks?

2 Answers2

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