How to observe the system calls of a program

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For an executable file or* command* exec, running this will list all system calls:

$ ptrace exec

To display specific system calls use -e option:

$ strace -e open exec

To save the output to a file use the -o option:

$ strace -o output exec

To find the system calls an active program uses, use the -p option while specifying the pid [how to get pid] :

$ sudo strace -p 1115

To generate a statistics report of all the system calls used, use option -c:

$ strace -c exec

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