Where can I find the source code for "reboot" command? [closed]

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From where to get the source code for reboot command in Linux ?

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See shutdown.c in util-linux.

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On RHEL / CentOS at least it's in the SysVinit package. You can determine this by

which reboot

to find the executable - it's in /sbin/reboot for me - then

rpm -qf /sbin/reboot

to find out which package it is in. You should then be able to download a SRPM from any CentOS mirror, e.g. http://www.mirrorservice.org/sites/mirror.centos.org/5.5/os/SRPMS/