I go via the test-driven approach. 1. I write down (on paper or plain text editor) a list of tests or specification that would satisfy the needs of the problem. – simple calculations (no discounts and concessions) with: – single item – two items – maximum number of items that doesn’t have a discount – … Read more
Here’s what I use: @echo off rem there is a tab in the file at the end of the line below set tab= set cmd=javaw -jar lib\MyProg.jar set dir=%~dp0 echo Starting MyProg set pid=notfound for /F “usebackq tokens=1,2 delims=;=%tab% ” %%i in ( `wmic process call create “%cmd%”^, “%dir%”` ) do ( if /I %%i … Read more
Streams are blocking by default. TCP/IP streams, filesystem streams, pipe streams, they are all blocking. When you tell a stream to give you a chunk of bytes it will stop and wait till it has the given amout of bytes or till something else happens (an interrupt, an end of stream, an error). The operating … Read more
Value 127 is returned by /bin/sh when the given command is not found within your PATH system variable and it is not a built-in shell command. In other words, the system doesn’t understand your command, because it doesn’t know where to find the binary you’re trying to call.
No event will ever occur while a process is running! When a process is woken by an event, it runs to completion (“end process”) or an explicit “wait” statement, and goes to sleep. This takes, notionally, ZERO time. Which means that if you have loops in your process, they are effectively unrolled completely, and when … Read more