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Overview
This is the personal tech blog of Andreas Heck. I'm a software developer living in Germany and here I write about topics like Linux, C/C++, Python and other technical things that might be of concern to me.
News
Limiting which Syscalls to Trace with Strace
Tracing a program with strace generates a lot of output because of the sheer number of syscalls every program calls during its runtime. This can become overwhelming very quickly, making it hard to analyze the trace and find what you are looking for. Fortu
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Finding out where Syscalls are Called From: Stack Traces with Strace
One of the great strengths of strace as a debugging tool is that it shows you what a program is doing regardless of whether it was compiled with debug info or not. The downside of this is that you only see the program's syscall. You can use this informati
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Introduction to Strace
There is probably no debugging tool on Linux that is more valuable and versatile than strace. This tool shows us all the calls a program makes to the operating system, including the data it transmits to the operating system via these calls and the return
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Dynamic Printf Debugging with GDB
When we debug a program with printf() we have to recompile it whenever we add new printf() statements! Right!? Wrong! With gdb we can add printf() statements without recompiling a program and even add them while it is running. Adding Printfs with GDB Let'
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Making the most of your Shells History on Linux and macOS
Modern UNIX shells like bash (default on Linux) and zsh (default on macOS) keep a history of all the commands you enter. The easiest way to access this history is by pressing the up and down cursor keys to browse through the last commands. But this is onl
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