execute shell commands using perl while keeping shell environment variables

Question

I need to run sequential shell commands using perl, but I need the shell environment to keep its variables.

for example:

$result = `cd /`;
$result = `touch test.txt`;

In this example, I need test.txt to be created on /.

Also, I don't want to run them in one line code like $result=touch /test.txt; I need seperate calls to shell while environment variables remain the same.

Would you expect running bash -c 'cd /' to do anything useful? — Brad Gilbert
– Brad Gilbert, Commented Apr 3, 2013 at 14:30
Yes, I would. It's just an example to describe what I need. This example may not look to be useful, but in the case that I need, it's extremely useful. — Hamed Afshar
– Hamed Afshar, Commented Apr 3, 2013 at 18:33
That was a rhetorical question. bash -c 'cd /' does not do anything useful. It creates a sub-shell that sets it's working directory, that then returns an errorlevel of 0. When it's done you have the same working directory that you started out with. The only thing it can do, is find out if the directory exists. — Brad Gilbert
– Brad Gilbert, Commented Apr 3, 2013 at 18:46

Miguel Prz · Accepted Answer · 2013-04-03 08:22:00Z

3

chdir '/';
$result = `touch test.txt`;

answered Apr 3, 2013 at 8:22

Miguel Prz

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4 Comments

Hamed Afshar Over a year ago

Thanks, but I need 2 separate shell calls using the same function. "chdir" is not a shell call and is not as same as backticks.

Miguel Prz Over a year ago

you could create a shell script file (example.sh) with the commands needed, and call this script from Perl

Hamed Afshar Over a year ago

Yes, but then, I can't get separate results from each command. I may need to manipulate the results of each command and decide what to do next.

Miguel Prz Over a year ago

In that case, use the perl equivalents and you have the whole control

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