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in terms of system calls, when bash process executes cat </tmp/input command it does the following:

issues the exec system call to execute the cat program and then issues a system call to substitute standard input with /tmp/input
issues a system call to create a new copy of itself, in that copy it issues a system call to substitute standard input with /tmp/input and finally issues the exec system call to execute the cat program
issues a system call to create a new copy of itself, in that copy it issues a system call to close the lowest file descriptor, then issues a system call to open /tmp/input and finally issues the exec system call to execute the cat program
issues the exec system call to execute the cat program, then issues a system call to close the lowest file descriptor and finally issues a system call to open /tmp/input
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