CODEWITHSUNDEEP
bashperl
acbh
acbh

Reputation: 167

Passing an environment variable to a bash script over ssh from perl system

Currently I am executing run scripts using perl system by sshing into a remote machine:

system("ssh -t remote $dir/bashscript> $dir/stdout.stdout 2> $dir/stderr.stderr &");

I want to pass an environment variable to the bashscript on my remote machine (a directory to be specific). What is the best way to do it? And what should I add in my bashscript to accept the argument?

Upvotes: 1

Views: 680

Answers (2)

redneb
redneb

Reputation: 23850

Try this:

system("ssh -t remote FOO='dir/dir/filename.stderr' $dir/bashscript> $dir/stdout.stdout 2> $dir/stderr.stderr &");

Note that if the value comes from an untrusted source this can be dangerous. You should really escape the value before you pass is like that. For example, you could do something like this:

my $foo='some value here';
$foo=~s/'/'\\''/g; # escape the '
system("ssh -t remote env FOO='$FOO' $dir/bashscript> $dir/stdout.stdout 2> $dir/stderr.stderr &");

In either case, bashscript can access the value via $FOO.

Upvotes: 1

mob
mob

Reputation: 118605

With all of @redneb's caveat's about sanitizing input

ssh remotehost FOO=bar \; export FOO \; script > out 2> err

or if you're sure that the shell on the remote host will be bash, the more compact

ssh remotehost export FOO=bar \; script > out 2> err

Upvotes: 0

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