halt command in Linux with examples Last Updated : 21 May, 2019 Comments Improve Suggest changes Like Article Like Report This command in Linux is used to instruct the hardware to stop all the CPU functions. Basically, it reboots or stops the system. If the system is in runlevel 0 or 6 or using the command with --force option, it results in rebooting of the system otherwise it results in shutdown. Syntax: halt [OPTION]... Options: Option Description -f, --force It does not invoke shutdown. -w, --wtmp-only It will not call shutdown or the reboot system call but writes the shutdown record to /var/log/wtmp file. -p, --poweroff To behave as poweroff --verbose Gives verbose messages when reebooting which helps in debugging problems with shutdown. Files: /var/log/wtmp : Consists a new runlevel record for the shutdown time. /var/run/utmp : Gets updated by a shutdown time record when the current runlevel will be read. Example 1: To cease all CPU function on the system. $halt Output: Broadcast message from ubuntu@ubuntu root@ubuntu:/var/log# (/dev/pts/0) at 10:15... The system is going down for halt NOW. Example 2: To power off the system using halt command. $halt -p Output: Broadcast message from ubuntu@ubuntu (/dev/pts/0) at 10:16... The system is going down for power off NOW. Example 3: halt command with -w option to write shutdown record. $halt -w Note: For this, there will be no output on the screen. Comment More infoAdvertise with us D Deepanshi_Mittal Follow Improve Article Tags : Technical Scripter Linux-Unix Technical Scripter 2018 Similar Reads gdb command in Linux with examples GDB, the acronym for GNU Debugger, is a powerful debugging tool used to analyze and debug programs written in languages like C, C++, Ada, and Fortran. It allows developers to inspect the behavior of their programs, step through code, set breakpoints, and examine variable values in real-time. 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