is Shell scripts execution synchronous?

Question

By default Shell scripts execution is synchronous in behaviour? ``` Script1 Script2 ``` I have a script1 which will take more than 4 mins to complete and the next job is dependant on this.(Similar to producer and consumer problem). Wanted to know whether the script2 waits till script1 complete the execution.

Accepted Answer

While i'm not fully sure what you want to know, here are some common things.

You can run paralell scripts - sending them to the background, like:

```
script1 &
script2 &
script3 &
```

all 3 script will run in "parallel".

Now probably what you want to know - serial execution, when the second is depend on first.

It is achieved with `pipe` mechanism. Imagine:

```
long_running_script_what_produdes_lines | wc -l
```

both programs are run simultaneously, and the `wc` waits for the output from the `long_running_script_what_produdes_lines` and will count the the all lines.

Here are other `IPC` (InterProcess communication) methods too, (e.g. named pipes, signals).

If you need to know something other, please rephrase the question.

is Shell scripts execution synchronous?

Solution

Problem