What is the difference between reboot and shutdown -r?

Question

The title says it all: What is the difference between executing shutdown -r and reboot?

Solution

Nothing, both of them do the same task.

From the respective man pages:

man reboot:

reboot, halt, poweroff

These programs allow a system administrator to reboot, halt or poweroff the system.

man shutdown -r:

Requests that the system be rebooted after it has  been brought down.

Without the -f option for reboot, it will gracefully terminate all processes, sending signal 15. However, using reboot -f will invoke the reboot(2) system call itself (with REBOOTCOMMAND argument passed) and directly reboots the system.

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From a similar question on Unix and linux:

Internally, reboot uses shutdown -r.

Comments

[Ahmadgeo]

Will they both reboot the system after gracefully stopping running services? I usually user reboot, but I have a concern that it terminates running processes.

[jobin]

Answered your comment in the answer, please have a look.

[Gyergyói Dávid]

Then why can my system froze by the reboot command and why not when I use 'shutdown -r now'?