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lsof is a command meaning "list open files", which is used in many Unix-like systems to report a list of all open files and the processes that opened them. This open source utility was developed and supported by Victor A. Abell, the retired Associate Director of the Purdue University Computing Center.
Take for example one line in the ls -l output: drwxr-xr-x 2 root root 0 Jan 1 1970 home POSIX specifies [5] the format of the output for the long format (-l option). In particular, the first field (before the first space) is dubbed the "file mode string", here drwxr-xr-x. Its first character describes the file type, here d (directory).
The command ls -l is executed as a process, the output (stdout) of which is piped to the input (stdin) of the process for grep key; and likewise for the process for less. Each process takes input from the previous process and produces output for the next process via standard streams.
ls, a command specified by POSIX and by the Single UNIX Specification; used for listing files.ls, the internet top-level domain for Lesotho; Link-state routing protocol, used in packet-switching networks; Location Services, a component of Microsoft's System Center Configuration Manager software; LS, a low-power Schottky version of a 7400 series ...
Example usage of tee: The output of ls -l is redirected to tee which copies them to the file file.txt and to the pager less. The name tee comes from this scheme - it looks like the capital letter T. The tee command is normally used to split the output of a program so that it can be both displayed and saved in a file. The command can be used to ...
Modern Linux distributions include a /sys directory as a virtual filesystem (sysfs, comparable to /proc, which is a procfs), which stores and allows modification of the devices connected to the system, [20] whereas many traditional Unix-like operating systems use /sys as a symbolic link to the kernel source tree.
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
ls: Filesystem Mandatory List directory contents Version 1 AT&T UNIX m4: Misc Mandatory Macro processor PWB UNIX mailx: Misc Mandatory Process messages Version 1 AT&T UNIX make: Programming Optional (SD) Maintain, update, and regenerate groups of programs PWB UNIX man: Misc Mandatory Display system documentation Version 2 AT&T UNIX mesg: Misc ...