In Unix shells, wait is a command which pauses until execution of a background process has ended. wait [n...] where n... is a list of pids or job IDs...
3 KB (304 words) - 15:23, 16 May 2025
1970, the Unix epoch. For example, at midnight on 1 January 2010, Unix time was 1262304000. Unix time originated as the system time of Unix operating...
52 KB (5,507 words) - 19:53, 23 July 2025
Research Unix refers to the early versions of the Unix operating system for DEC PDP-7, PDP-11, VAX and Interdata 7/32 and 8/32 computers, developed in...
22 KB (1,356 words) - 04:00, 26 June 2025
List of POSIX commands (redirect from List of Unix utilities)
which is part of the Single UNIX Specification (SUS). These commands are implemented in many shells on modern Unix, Unix-like and other operating systems...
22 KB (168 words) - 02:46, 5 August 2025
developed for Unix-like operating systems. It is designed as a 100% free alternative for the Bourne shell sh and other proprietary Unix shells. Bash has...
137 KB (12,439 words) - 21:44, 9 August 2025
In a Unix or Unix-like operating system, job control refers to controlling a process group as a job via a shell. Control features include suspend, resume...
9 KB (1,181 words) - 13:05, 3 August 2025
Load (computing) (redirect from Unix load average)
using or waiting for CPU (the ready queue or run queue) increments the load number by 1. Each process that terminates decrements it by 1. Most UNIX systems...
13 KB (1,639 words) - 17:40, 23 May 2025
In most Unix and Unix-like operating systems, the ps (process status) program displays the currently-running processes. The related Unix utility top provides...
6 KB (524 words) - 09:55, 3 January 2025
Sleep (command) (redirect from Sleep (Unix command))
In computing, sleep is a command in Unix, Unix-like and other operating systems that suspends program execution for a specified time. The sleep instruction...
7 KB (668 words) - 17:04, 25 November 2022
database of quotations. Early versions of the program appeared in Version 7 Unix in 1979. The most common version on modern systems is the BSD fortune, originally...
9 KB (806 words) - 09:24, 27 May 2025
Cron (redirect from Crontab (Unix command))
Chronos, the Greek word for time. The command is generally available on Unix-like operating systems. The actions of cron are driven by a crontab (cron...
26 KB (3,262 words) - 02:18, 5 August 2025
processing methods". nginx.org. poll – System Interfaces Reference, The Single UNIX Specification, Version 5 from The Open Group man-pages for poll(2) in FreeBSD...
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File descriptor (category Unix file system technology)
In Unix and Unix-like computer operating systems, a file descriptor (FD, less frequently fildes) is a process-unique identifier (handle) for a file or...
13 KB (1,189 words) - 23:54, 12 April 2025
In computing, time is a command in Unix and Unix-like operating systems. It is used to determine the duration of execution of a particular command. time(1)...
8 KB (898 words) - 19:09, 28 July 2025
The Unix file system (UFS) is a family of file systems supported by many Unix and Unix-like operating systems. It is a distant descendant of the original...
17 KB (1,966 words) - 06:52, 12 March 2025
Fork (system call) (redirect from Fork (Unix))
In computing, particularly in the context of the Unix operating system and its workalikes, fork is an operation whereby a process creates a copy of itself...
17 KB (2,188 words) - 10:29, 12 July 2025
have a higher risk of major data loss. The term is largely specific to Unix and Unix-like systems. The equivalent on Microsoft Windows operating systems...
16 KB (1,651 words) - 20:25, 20 June 2025
Shell script (redirect from Unix shell scripting)
A shell script is a computer program designed to be run by a Unix shell, a command-line interpreter. The various dialects of shell scripts are considered...
25 KB (3,137 words) - 04:49, 31 July 2025
Signal (IPC) (redirect from Sigprocmask (Unix))
limited form of inter-process communication (IPC), typically used in Unix, Unix-like, and other POSIX-compliant operating systems. A signal is an asynchronous...
31 KB (3,432 words) - 00:48, 4 May 2025
Netstat (redirect from Netstat (Unix))
interface) and network protocol statistics. It is available on Unix, Plan 9, Inferno, and Unix-like operating systems including macOS, Linux, Solaris and...
18 KB (1,072 words) - 23:29, 9 August 2025
Filesystem Hierarchy Standard (redirect from Unix FHS)
used for the layout of Unix-like systems. It has been made popular by its use in Linux distributions, but it is used by other Unix-like systems as well...
26 KB (1,596 words) - 17:19, 5 August 2025
STREAMS (redirect from UNIX System V STREAMS)
In computer networking, STREAMS is the native framework in Unix System V for implementing character device drivers, network protocols, and inter-process...
17 KB (1,977 words) - 18:05, 2 July 2025
h – Base Definitions Reference, The Single UNIX Specification, Version 5 from The Open Group wait(2): wait for process to change state – Linux Programmer's...
5 KB (631 words) - 23:50, 30 April 2025
Talk (software) (redirect from Unix talk)
talk is a Unix text chat program, originally allowing messaging only between the users logged on to one multi-user computer—but later extended to allow...
7 KB (706 words) - 02:26, 27 July 2025
type void. In Unix and other POSIX-compatible systems, the parent process can retrieve the exit status of a child process using the wait() family of system...
15 KB (1,646 words) - 14:17, 19 January 2025
POSIX (redirect from Sys/wait.h)
utility interfaces, for software compatibility (portability) with variants of Unix and other operating systems. POSIX is also a trademark of the IEEE. POSIX...
29 KB (2,795 words) - 14:00, 27 July 2025
On Unix and Unix-like computer operating systems, a zombie process or defunct process is a process that has completed execution (via the exit system call)...
9 KB (1,344 words) - 06:08, 10 July 2025
Iostat (redirect from Iostat (Unix))
the system was last rebooted. The iostat tool is available on most Unix and Unix-like operating systems, such as FreeBSD, macOS (com.apple.pkg.Core package)...
5 KB (532 words) - 10:01, 18 September 2022
Thompson shell (redirect from Original Unix shell)
The Thompson shell was the first Unix shell, introduced in the first version of Unix in 1971, and was written by Ken Thompson. It was a simple command...
8 KB (931 words) - 12:43, 15 November 2024
Message queue (section Implementation in UNIX)
common message queue implementations in UNIX. One is part of the SYS V API, the other one is part of POSIX. UNIX SYS V implements message passing by keeping...
16 KB (1,952 words) - 21:38, 4 April 2025