Executing System Commands from PeopleCode and Getting STDOUT
By Chris Malek | Sun, May 15, 2016
I recently had a need to execute some OS system level calls in PeopleCode but I needed to get the output of the command call. I did some googling and found that some other bloggers had already done this. I am documenting this on my own blog as I can think of many future uses of this for some code I plan on releasing this year.
I actually needed to get the OS version for Oracle support. However, I did not want to wait for a response from the system admins. So I wrote a quick function in my Unit Test Page to return the OS version.
Here is the PeopleCode.
Function getOSVersion() returns string &commandPath = "cat /etc/redhat-release"; Local JavaObject &runtime = GetJavaClass("java.lang.Runtime").getRuntime(); Local JavaObject &process = &runtime.exec(&commandPath); Local JavaObject &inputStreamReader = CreateJavaObject("java.io.InputStreamReader", &process.getInputStream()); Local JavaObject &bufferedReader = CreateJavaObject("java.io.BufferedReader", &inputStreamReader); Local integer &returnCode = &process.waitFor(); Local any &inputLine; Local any &fullOutput; While True &inputLine = &bufferedReader.readLine(); If (&inputLine <> Null) Then &fullOutput = &fullOutput | &inputLine; Else Break; End-If; End-While; return &fullOutput ; End-Function;
This function gets the Linux OS version of a RedHat server by calling the operating system
CAT command with some parameters.
The full command is:
You could substitute any executable in that process and get the results.
If you need to look for the return code you can see this line from above.
Local integer &returnCode = &process.waitFor();
My example code does not do anything with the &returnCode but if the executable you are calling relies on return codes you can use that integer to respond to the return code.
I have to give full credit to Jim Marion as I did not know this was possible until a google search found that he had written a great article which this code was adopted from called AppEngine Output Tricks, Reporting, Logging, Etc.
Also @vindac wrote a short post Execute shell commands using Java Runtime in PeopleCode that has a slight variation that was also helpful.
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