strace

strace command is used to trace system calls. This is useful to see what a process is doing.

To see what a process doing, run

strace -p PID_HERE

To run a command and strace

strace cat 1.txt

Debug apache start up

strace -Ff -o output.txt -e open /etc/init.d/httpd restart
cat output.txt | grep '= -1'

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