strace is a useful little utility – installed by default on most Linux systems – which allows you to find out what a program is doing under the hood by tracing the system calls it's making.
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Linux super-duper admin tools: Strace
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Strace is a utility that can trace system calls. If you're wondering what system calls are, they are a translation mechanism that provides interface between a process and the operating system (kernel). These calls can be intercepted and read, allowing for a better understanding of what a process is trying to do at a given runtime.
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