crontab

array declaration of shellscript doesnot work in scheduled cron job?

由 寵の児 提交于 2020-01-06 12:29:27
问题 I have created a shell script named "script.sh" which reads an arrays elements and prints it on terminal. The script is as follows: arr=("hello" "world") for i in ${arr[@]} do echo $i; done It gives expected output i.e 'Hello World' on executing it in terminal, but if I schedule the same script in crontab jobs to get executed automatically every minute and store the output in another file,the job fails and gives /home/vikash/script.sh: 1: Syntax error: "(" unexpected error. The crontab job to

array declaration of shellscript doesnot work in scheduled cron job?

由 |▌冷眼眸甩不掉的悲伤 提交于 2020-01-06 12:28:10
问题 I have created a shell script named "script.sh" which reads an arrays elements and prints it on terminal. The script is as follows: arr=("hello" "world") for i in ${arr[@]} do echo $i; done It gives expected output i.e 'Hello World' on executing it in terminal, but if I schedule the same script in crontab jobs to get executed automatically every minute and store the output in another file,the job fails and gives /home/vikash/script.sh: 1: Syntax error: "(" unexpected error. The crontab job to

why my svn backup shell script, works fine in terminal, but fails in crontab?

由 若如初见. 提交于 2020-01-06 04:25:08
问题 I have a svn backup script in a redhat linux. let's it called svnbackup.sh It works fine, when I run it in terminal. But when I put it into crontab, it will not bring the svnserve back, even the data is backuped correctly. What's wrong with me??? killall svnserve tar -zcf /svndir /backup/ svnserve -d -r /svndir 回答1: Usually, 'environment' is the problem in a cron job that works when run 'at the terminal' but not when it is run by cron. Most probably, your PATH is not set to include the

linux下的“定时器”：crontab

由 ＊爱你＆永不变心＊ 提交于 2020-01-05 03:59:33
1、概述 crontab是用来设置在固定时间点或时间间隔执行某条指令，类似于时程表。使用-u user是指定user用户的时程表。 2、参数 -e[UserName] :调出编辑器，编辑定时任务，打开后里边有多重文本编辑器，可更具自己偏好选择，若未指定UserName，则是当前shell下的用户 -r[UserName] :删除指定用户当前的时程表，则是当前shell下的用户 -l[UserName] :列出指定用户当前的时程表，则是当前shell下的用户 -v[UserName] :列出指定用户的cron作业状态，则是当前shell下的用户 3、时程表的格式说明 F1 F2 F3 F4 F5 program (分钟 小时 日 月 星期 作业命令) 例如：5 */1 * * * /usr/sbin/ntpdate cms是指在每小时的第5分钟执行/usr/sbin/ntpdate cms这个命令。 说明见下图： 4、样例 #每天早上6点10分 10 6 * * * date #每两个小时 0 */2 * * * date #晚上11点到早上8点之间每两个小时，包括早上8点 0 23-7/2,8 * * * date #每个月的4号和每个礼拜一到礼拜三的早上11点 0 11 4 * 1-3 date #1月1日早上4点 0 4 1 1 * date 编写执行命令时要注意当前的环境变量

How to use perl to modify crontab? [closed]

由 时光毁灭记忆、已成空白 提交于 2020-01-05 00:49:28
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . How could I append a cron task in crontab via a perl script? I thought of the following: #!/usr/bin/perl use strict; use warnings; `crontab<<EOL 00 * * * * /home/slynux/download.sh EOL` I don't want to mess up things, so am I on the right track? Also if I append it, how would I remove it? I am new in Perl 回答1:

Mac crontab 教程

由 泪湿孤枕 提交于 2020-01-03 14:05:56
mac 的crontab 不同的地方在于需要先通过 su 切换到 root 权限 然后再使用 crontab -u user -e 来编辑 编辑完以后 切换回mac 用户 可以用crontab -u user -l 来查看是否保存成功 关键在于 切换权限和 -u命令来判断是否成功 crontab 教程 */8 * * * * sh ./sh 每八分钟运行一次 sh 脚本 来源： CSDN 作者： White_______ 链接： https://blog.csdn.net/White_______/article/details/103818196

cron command to execute a php script periodically

由 ￣綄美尐妖づ 提交于 2020-01-03 05:10:25
问题 I am using Ubuntu. Earlier I used to run cron jobs from GUI. I have created a php script and saved it on my server. i tried to execute cron from putty, 5 * * * * path/folder/sample.php // script runs for every 5 mins But it doesn't work. Am I in the right direction? Actually, where should be the command get executed dynamically? 回答1: The most sure way is specify path to your interpreter. You should also change 5 to */5 (which mean run every five minutes nor than run at 5 minutes past each

Linux crontab 命令基本说明

由 可紊 提交于 2020-01-03 05:08:03
Linux crontab是用来定期执行程序的命令。 当安装完成操作系统之后，默认便会启动此任务调度命令。 crond 命令每分锺会定期检查是否有要执行的工作，如果有要执行的工作便会自动执行该工作。 而 linux 任务调度的工作主要分为以下两类： 1、系统执行的工作：系统周期性所要执行的工作，如备份系统数据、清理缓存 2、个人执行的工作：某个用户定期要做的工作，例如每隔10分钟检查邮件服务器是否有新信，这些工作可由每个用户自行设置 语法 crontab [ -u user ] file 或 crontab [ -u user ] { -l | -r | -e } 说明： crontab 是用来让使用者在固定时间或固定间隔执行程序之用，换句话说，也就是类似使用者的时程表。 -u user 是指设定指定 user 的时程表，这个前提是你必须要有其权限(比如说是 root)才能够指定他人的时程表。如果不使用 -u user 的话，就是表示设定自己的时程表。 参数说明 ： -e : 执行文字编辑器来设定时程表，内定的文字编辑器是 VI，如果你想用别的文字编辑器，则请先设定 VISUAL 环境变数来指定使用那个文字编辑器(比如说 setenv VISUAL joe) -r : 删除目前的时程表 -l : 列出目前的时程表 时间格式如下： f1 f2 f3 f4 f5 program 其中

cron job to execute r script not working

由 荒凉一梦 提交于 2020-01-03 03:06:08
问题 I am new to cron. I want to execute r script on regular basis using cron. I just added the job to crontab to check if it is working. But unfortunately, nothing is working. I wrote a test script and scheduled it for every 5 mins in cron job. Here is test R script: print('HI') cronjob: 5 * * * * sudo Rscript /path/to/script/test.R but when I execute it from terminal, it works fine. terminal command: sudo Rscript /path/to/script/test.R Please tell me if I am missing something here. I was trying

running a script from cron every second

由 只谈情不闲聊 提交于 2020-01-03 02:01:07
问题 i have a script which i am running from browser with meta refresh and it workd without any issue in browser but it will not work in cron so what i can do to run every second from cron? i know with sleep i can but i have to create several cron tab in cron job and every time i have to run the script with sleep how can i run this script every 5 sec. <meta http-equiv="refresh" content="5;url=test.php"> <?php $res = mysql_query("SELECT * FROM tableA where st='0' order by id asc LIMIT 1"); $row =
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