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/usr: Secondary hierarchy for read-only user data; contains the majority of user utilities and applications. Should be shareable and read-only. [9] [10] /usr/bin: Non-essential command binaries (not needed in single-user mode); for all users. /usr/include: Standard include files. /usr/lib: Libraries for the binaries in /usr/bin and /usr/sbin ...
/usr/sbin/tcpkill −9 host www.google.com. The computer that is attempting to go to that site will be blocked from that site only, but can surf any other site. It is a good idea to either redirect the output into nothingness ( > 2>/dev/null 1>/dev/null) or into a file for later analysis (> file.tcpkill ). By default, it will redirect output to ...
Stands for binaries and contains certain fundamental utilities, such as ls or cp, that are needed to mount /usr, when that is a separate filesystem, or to run in one-user (administrative) mode when /usr cannot be mounted. In System V.4, this is a symlink to /usr/bin. Otherwise, it needs to be on the root filesystem itself. /boot
In earlier times, most critical commands (including shells) in /sbin or even /bin were statically linked for this purpose, whereas in /usr/sbin and /usr/bin you would find the more feature-rich versions that were dynamically linked. This is not common anymore and as such, statically linked shells with built-in commands have become more important.
On most Linux systems, iptables is installed as /usr/sbin/iptables and documented in its man pages, which can be opened using man iptables when installed. It may also be found in /sbin/iptables, but since iptables is more like a service rather than an "essential binary", the preferred location remains /usr/sbin.
The superuser also typically has /sbin and /usr/sbin entries for easily executing system administration commands. The current directory ( . ) is sometimes included by users as well, allowing programs residing in the current working directory to be executed directly.
Finally, the path and the arguments of an external program are given. As usual, the first argument is the program name. In the example, inetd is told to launch the program /usr/sbin/telnetd with the command line arguments telnetd -a. inetd automatically hooks the socket to stdin, stdout, and stderr of the server program.
And in Linux system the system files are located under folders /boot (the kernel itself), /usr/sbin (system utilities) and /usr/lib/modules (kernel device drivers This computing article is a stub . You can help Wikipedia by expanding it .