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top (table of processes) is a task manager or system monitor program, found in many Unix-like operating systems, that displays information about CPU and memory utilization. Overview [ edit ]
read: Shell programming Mandatory Read a line from standard input readlink: Filesystem Mandatory Print destination of a symbolic link realpath: Filesystem Mandatory Resolve a symbolic link renice: Process management Mandatory Set nice values of running processes 4BSD rm: Filesystem Mandatory Remove directory entries Version 1 AT&T UNIX rmdel: SCCS
The w and top commands show the same three load average numbers, as do a range of graphical user interface utilities.. In operating systems based on the Linux kernel, this information can be easily accessed by reading the /proc/loadavg file.
read is a command found on Unix and Unix-like operating systems such as Linux. It reads a line of input from standard input or a file passed as an argument to its -u flag, and assigns it to a variable.
Linux is the leading operating system on servers (over 96.4% of the top one million web servers' operating systems are Linux), [48] leads other big iron systems such as mainframe computers, [clarification needed] [49] and is used on all of the world's 500 fastest supercomputers [h] (as of November 2017, having gradually displaced all competitors).
In modern POSIX compliant operating systems, a program that needs to access data from a file stored in a file system uses the read system call. The file is identified by a file descriptor that is normally obtained from a previous call to open .
The man page for the sed utility, as seen in various Linux distributions. A man page (short for manual page) is a form of software documentation found on Unix and Unix-like operating systems. Topics covered include programs, system libraries, system calls, and sometimes local system details. The local host administrators can create and install ...
Many Linux distributions use readahead on a list of commonly used files to speed up booting. In such a setup, if the kernel is booted with the profile boot parameter, it will record all file accesses during bootup and write a new list of files to be read during later boot sequences. This will make additional installed services start faster ...