Login or Register to Ask a Question and Join Our Community


UNIX for Dummies Questions & Answers

Execute crontab for every 4 hours and begin from current time

 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers Execute crontab for every 4 hours and begin from current time
# 8  
Old 05-31-2011
At does sound more like a job for "at" than "crontab". Though "at" does of course use cron.
Say you script called "scriptname" had this near the beginning:
Code:
echo "scriptname" | at now + 4 hours

Any recursive script like this should have a means of stopping the script (e.g. test for a "stop" file).
 
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

File write begin/end, recording time

Hello all, How can I find out the start and end of the writing file in the directory or recording time for writing file? I have a directory where small ~ 1*MB temporary files are written. After the end of the record, they are retrieved and erased. I can only find out that the files are... (4 Replies)
Discussion started by: mrAibo
4 Replies

2. Shell Programming and Scripting

Log search and mail it if the log is updated before 24 hours from the current time

Hi , We have around 22 logs , each has different entries. I have to automate this using shell script. The ideas which am sharing is given below 1) We use only TAIL -100 <location and name of the log> Command to check the logs. 2) We want to check whether the log was updated before 24... (13 Replies)
Discussion started by: Kalaihari
13 Replies

3. UNIX for Dummies Questions & Answers

Adding hours and minutes to current date (Only to date not to time)

Hi, I want to add some hours and minutes to the current date. For example, if the current date is "July 16, 2012 15:20", i want to add 5 hours 30 minutes to "July 16, 2012 00:00" not to "July 16, 2012 15:20". Please help. Thanks! (4 Replies)
Discussion started by: manojgarg
4 Replies

4. HP-UX

Crontab do not run on PM hours

Hi All I have a problem, I wonder if you can help me sort it out: I have the following entry in the cron: 00 1,13 * * * /home/report/opn_amt_gestores_credito.ksh > opn_amt_gestores_credito.log But the entry only runs at 01:07 I have stopped the cron deamon, and started, but it still... (39 Replies)
Discussion started by: fretagi
39 Replies

5. AIX

crontab 1 hour off from current time

This is a new one on me. We upgraded a system from AIX 5.3 TL 7 to 6.1 TL 7 yesterday. The app people notified us that their cron jobs weren't running at the right time. So I made a test cron entry and here's what I've found: # crontab -l * * * * * /usr/bin/date > /tmp/test.log 2>&1 # cat... (2 Replies)
Discussion started by: homeyjoe
2 Replies

6. Shell Programming and Scripting

Adding hours to current date

Hi, any idea how to add hours to current date in unix. thanks in advance (9 Replies)
Discussion started by: Abhijeet_Atti
9 Replies

7. Shell Programming and Scripting

Reading Hours and Minutes from file and comparing with current

Hi, Time till when the application should run is indicated in a file. First line is hour and second line is minute. file: 10 55 Means my application should run till 10:55. Now in a shell script, i am trying to make that logic but with no luck. min=`tail -n 1 /file_with_time`... (1 Reply)
Discussion started by: SGD
1 Replies

8. Solaris

How to define every 5 hours in Crontab

Hi Experts, I want to run a script which will move the files from particular directory to another backup directory After EVERY 5 hour. How can I put it in crontab- 5 hours!!! * * * * /home/movefilescritp.sh //purple (8 Replies)
Discussion started by: thepurple
8 Replies

9. UNIX for Dummies Questions & Answers

crontab every 2 minutes, 24 hours and once a week

can someone please check my answers for the crontabs I am making 1. how would I set up a crontab tab executes every 2 minutes each and every day of the week? answer: 2 * * * * /path/to/file.pl <-- is this correct? 2. how would I set up a crontab that executes every 24 hours at 2am?... (6 Replies)
Discussion started by: Bobafart
6 Replies

10. UNIX for Dummies Questions & Answers

AT command to batch execute every x hours

I want to schedule a batch job (SQL)to run every 6 hours in Unix and the AT command syntax does not seem to cover this. I have created a file ncd_rpt in the directory report and have given the command in this file. at -f /report/ncd_rpt 1:00 am tomorrow I schedule this by running sh... (1 Reply)
Discussion started by: naveen79
1 Replies
Login or Register to Ask a Question

LEARN ABOUT NETBSD

crontab

CRONTAB(1)						    BSD General Commands Manual 						CRONTAB(1)

NAME

     crontab -- maintain crontab files for individual users (ISC Cron V4.1)

SYNOPSIS

     crontab [-u user]
     crontab [-elr]

DESCRIPTION

     crontab is the program used to install, deinstall, or list the tables used to drive the cron(8) daemon in ISC Cron.  Each user can have their
     own crontab, and though these are files in /var/cron, they are not intended to be edited directly.

     If the /var/cron/allow file exists, then you must be listed therein in order to be allowed to use this command.  If the /var/cron/allow file
     does not exist but the /var/cron/deny file does exist, then you must not be listed in the /var/cron/deny file in order to use this command.
     If neither of these files exists, depending on the compiled in settings, only the super user will be allowed to use this command, or everyone
     will be allowed to use this command.  On NetBSD everyone is allowed to use this command.

     The default maximum size for a crontab is 256 kilobytes, but this may be changed for all users on the system by putting the desired maximum
     size (in bytes) in the /var/cron/maxtabsize file.

     If the -u option is given, it specifies the name of the user whose crontab is to be tweaked.  If this option is not given, crontab examines
     ``your'' crontab, i.e., the crontab of the person executing the command.  Note that su(1) can confuse crontab and that if you are running
     inside of su(1) you should always use the -u option for safety's sake.

     The first form of this command is used to install a new crontab from some named file or standard input if the pseudo-filename ``-'' is given.

     The -l option causes the current crontab to be displayed on standard output.

     The -r option causes the current crontab to be removed.

     The -e option is used to edit the current crontab using the editor specified by the VISUAL or EDITOR environment variables.  After you exit
     from the editor, the modified crontab will be installed automatically.

FILES

     /var/cron/allow	   Optional list of users that are allowed to use crontab.
     /var/cron/deny	   Optional list of users that are disallowed to use crontab.
     /var/cron/maxtabsize  Maximum size of crontab files.  Defaults to 256 kilobytes.
     /var/cron/tabs/	   Directory containing the individual user crontab files, named after the user.

DIAGNOSTICS

     A fairly informative usage message appears if you run it with a bad command line.

SEE ALSO

     crontab(5), cron(8)

STANDARDS

     The crontab command conforms to IEEE Std 1003.2 (``POSIX.2'').  This new command syntax differs from previous versions of Vixie Cron, as well
     as from the classic Version 3 AT&T UNIX syntax.

AUTHORS

     Paul Vixie <vixie@isc.org>

BSD
								    May 6, 2010 							       BSD