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Date: 2012mar10 OS: Linux Q. Why do I get a different number each time I list /proc/self ? A. When you do:cd /proc ls -l selfExample output:lrwxrwxrwx 1 root root 64 Mar 9 23:32 self -> 17520/A new process is started to run ls. Its the process id for ls you are seeing. From the shell you can do:echo $$to see your process id. Or:PID=$$ echo My PID is $PIDin a shell script. From a C program do:pit_t pid = getpid();Still /proc/self is cool and useful. From a program you can read things from its folder.
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