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Re:Ask HN: What Linux diagnostic tools/commands do you use? by bennofs on Saturday July 15, 2017 @06:32PM (#14779408)
strace - to see what a program is doing / where exactly something is failing if the error message is bad

ltrace - same as above, if strace is not enough

perf trace - if you don't know the exact process to strace upfront

https://github.com/brendangregg/perf-tools - to track disk accesses or exec calls

env LD_DEBUG=all - debugging dynamic linker issues

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