help needede in backticks(``) and system function

[uva]

hello monks, what the difference between executing the external command in the system functionand the backticks operator. Is it correct ]system function] interpret the parent program and other one not.?

[ikegami]

The difference is whether the output (STDOUT) is captured or now. Backticks return what was printed to STDOUT, while system does not.

From the docs, it sounds like backticks always pass the command to a subshell, while it's possible to avoid running a subshell with system.

[uva]

thanks ikegami.... will both the execution will interrupt the paren.i mean, will parent program wait until the child completes execution.

[ikegami]

Yes, the parent will wait in both cases. Unless you do execute something like command & (unix) or start command (Windows).

fork+exec doesn't wait.
IPC::Open3 doesn't wait.
IPC::Run can do both.
The special syntax system 1, ... in Windows doesn't wait.

[planetscape]

Reading the following may help your understanding of this topic:


How do I get both the return value and text? backticks vs. system()
How do I store and manipulate the output from another process?
How to run a shell script from a Perl program?

HTH,