Linux 在特定时间运行命令
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Run a command at a specific time
提问by Eamorr
I'm trying to run a command at a specific time. I've looked at the "at" command, but I don't know how to get it working...
我正在尝试在特定时间运行命令。我看过“at”命令，但我不知道如何让它工作......
Here's what I do:
这是我所做的：
at 1843 (Enter)
php /run/this/script.php (Ctrl+D)
But how do I do this in a bash script? I mean, I need to press enter and "Ctrl+D" to set up the delay... How to do this in a script?
但是我如何在 bash 脚本中做到这一点？我的意思是，我需要按 Enter 和“Ctrl+D”来设置延迟...如何在脚本中执行此操作？
Any suggestions most welcome.
任何建议最欢迎。
Thanks in advance,
提前致谢，
采纳答案by Pointy
You could try this:
你可以试试这个：
at 1843 <<_EOF_
php /run/this/script.php
_EOF_
editif what you want to do is run Firefox, try this:
编辑如果你想做的是运行 Firefox，试试这个：
at 1843 <<_EOF_
DISPLAY=:0.0 /usr/bin/firefox
_EOF_
回答by geekosaur
In bashor zshyou can say
在bash或者zsh你可以说
at 1843 <<< 'php /run/this/script.php'
Failing that, you need to use a here document:
否则，您需要使用此处的文档：
at 1843 <<EOF
php /run/this/script.php
EOF
You might also want to look into cronfor regularly scheduled jobs; the crontabentry would look like
您可能还想查看cron定期安排的工作；该crontab条目将看起来像
43 18 * * * php /run/this/script.php
(EDIT: whoops, helps to recall which version of at. I think that may have been a local mod.)
（编辑：哎呀，有助于回忆哪个版本的at。我认为这可能是本地 mod。）
回答by drysdam
echo "php /run/this/script.php" | at 18:43
echo "php /run/this/script.php" | at 18:43
回答by Michael Berkowski
You can echo your command into atas input:
您可以将您的命令at作为输入回显：
echo "/usr/bin/php /run/this/script.php" | at 18:43
回答by funk
The atcommand is not installed by default to the systems I work (Ubuntu, RHEL) and I don't have permissions to install new software, so I use scripts that combine bash and awk in order to achieve the atfunctionality as follows:
将在命令不被默认为系统的I工作（Ubuntu的，RHEL）安装和我没有权限来安装新的软件，所以我用，为了实现结合bash和的awk脚本的功能如下：
#! /bin/bash
res=""
while [ ! $res ]; do
res=$( date | awk -v hour= -v min= '{
split(, tmp, ":" );
if( (tmp[1] == hour) && (tmp[2] == min) )
{
print "ok";
}
else
{
print "";
}
}' )
done
./atReplacement.sh $HOUR $MIN; [OTHER_COMMANDS]
./atReplacement.sh $HOUR $MIN; [OTHER_COMMANDS]
