At1
The symbol for the element astatine.
|
Results for At
|
On this page:
|
The noun has one meaning:
Meaning #1:
a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
Synonyms: astatine, atomic number 85
The at command is used to schedule commands to be executed once
at a particular time in the future. More precisely, it reads a series of commands from
standard input and collects them into one "at-job" which is carried out at a later
date. It is found in the Unix family of operating systems and other flavors as well. The at-job inherits the current environment
which can be useful. Many Unix systems allow the restriction of the at command.
at can be made to mail a user when done carrying out a scheduled job of theirs, can use more than one job
queue, and can read a list of jobs to carry out from a file instead of standard input. A sample command to compile a
C program at 11:45 A.M and email the results (STDOUT and STDERR) to your user ID would be:
echo "cc -o foo foo.c" | at 1145
It uses a daemon, atd, which waits in the background
periodically checking the list of jobs to do and executing those at their allotted time on behalf of at.
Using the batch command instead of at, it can be made to only run scheduled jobs if the
system's load average is below a certain value.
Windows NT/2000/XP also has an at command (similar to
cron), but it is deprecated in favor of Task
Scheduler.
| Unix command line programs and builtins (more) | |
|---|---|
| File and file system management | cat · chattr · cd · chmod · chown · chgrp · cksum · cmp · cp · du · df · file · fsck · fuser · ln · ls · lsof · mkdir · mount · mv · pwd · rm · rmdir · split · touch |
| Process management | at · chroot · crontab · exit · kill · killall · nice · pgrep · pidof · pkill · ps · sleep · time · top · wait · watch |
| User management/environment | env · finger · id · logname · mesg · passwd · su · sudo · uname · uptime · w · wall · who · whoami · write |
| Text processing | awk · comm · cut · ed · ex · fmt · head · iconv · join · less · more · paste · sed · sort · tac · tail · tr · uniq · wc · xargs |
| Shell programming | basename · echo · expr · false · printf · test · true · unset |
| Printing: lp · Communications: inetd · netstat · ping · rlogin · nc · traceroute · Searching: find · grep · strings · Miscellaneous: banner · bc · cal · dd · man · size · yes | |
This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
Join the WikiAnswers Q&A community. Post a question or answer questions about "At" at WikiAnswers.
Copyrights:
![]() | Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved. Read more | |
![]() | Columbia Encyclopedia. The Columbia Electronic Encyclopedia, Sixth Edition Copyright © 2003, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/ Read more | |
![]() | Medical Dictionary. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Read more | |
![]() | WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. Read more | |
![]() | Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "At (Unix)". Read more |