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
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strace -p PID_HERE |
To run a command and strace
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strace cat 1.txt |
Debug apache start up
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strace -Ff -o output.txt -e open /etc/init.d/httpd restart cat output.txt | grep '= -1' |