如何将命令行参数传递给应该在后台运行的脚本？

Question

How to pass command line argument to a script which should be run in the background? I tried the below command and it gives an error:

system("perl sample.pl& 1");
Error: 1: command not found

Answer 1

Arguments to the program being run in the background have to be placed before the ampersand:

perl sample.pl 1 &

What you typed is recognized by the shell (I'm assuming you're on a Unix or Linux variant) as 2 separate commands:

perl sample.pl

which is run in the background, and

1

Where the shell is reporting that 1 is not a valid command.

Answer 2

The reason that does not work is due to the all arguments must be before the ampersand

So system("perl sample.pl 1 &");

Alternatively you can use exec() or backticks. For example `perl sample.pl 1 &`

If you use exec though, just know it never returns where system does.