9 More Discussions You Might Find Interesting
1. HP-UX
Hi Guys,
I need help to clear my doubt w.r.t Crontab execution.
uname -a
HP-UX myservername B.11.31 U ia64 1422528451 unlimited-user licenseI created a crontab entry to execute particular job on Saturday 11/15/2014 11:22
Below is the cron entry
#refresh DEVDB from PRODDB
22 11 15 11 6... (6 Replies)
Discussion started by: rocky.community
6 Replies
2. UNIX for Dummies Questions & Answers
Dear Folks,
I have written a shell script which internally connects to oracle database through sqplplus command line.
The script runs fine when run manually.
Now I am scheduling it to run (Linux environment) from crontab.
In crontab it is failing with an error:
sqlplus command... (6 Replies)
Discussion started by: tamojitc
6 Replies
3. Shell Programming and Scripting
Hi All,
I am facing a problem with crontab.I made an entry in crontab like this
05 07 * * * /afs2/cdwfullacc/current/exe/cdw_generate_special_klant.sh > /afs2/cdwfullacc/current/scratch/cdw_gen_cron.log
But job was not getting executed.
Entry in crontab was made with same user by whom... (4 Replies)
Discussion started by: krishna_gnv
4 Replies
4. Shell Programming and Scripting
Hi,
I have shell script "A" which is executing oracle pl/sql procedure and initiate its multiple threads at a time as below on given user value in an other script "B".
I want to execute script "A" after every second with out cron tab as " A " will keep on executing after every second till... (1 Reply)
Discussion started by: saad.imran@gmai
1 Replies
5. Shell Programming and Scripting
I have an expect script that interrogates several hundred unix servers for both access and directories therein using "ssh user@host ls -l /path". The combination of host/path are unique but the host may be interrogated multiple times if there are multiple paths to test.
The expect script is run... (2 Replies)
Discussion started by: twk
2 Replies
6. UNIX for Dummies Questions & Answers
Hi
I have shell script to excute the SQL script.And i have scheduled those shell script in crontab.But the Shell script is not running timely and i got the below error
Crontab entry
15 05 17 7 * /export/home/vcpsapp/vcps/stat.sh
Output
Your "cron" job on uspxivus16... (3 Replies)
Discussion started by: mak_boop
3 Replies
7. UNIX for Dummies Questions & Answers
I need your help please
Inin a production system i found crontab entries was removed because i typed crontab -l with username corasc and didn't show anything.
i asked the administrador to restored the mentioned crontab, he restored the crontab:
The problem is when restored the crontab file is... (2 Replies)
Discussion started by: alexcol
2 Replies
8. Shell Programming and Scripting
is it possible to soecify time overnight in 5 days for example:
0 18-7 * * 1-5 /mycode
is this okay to use 18-7 because im not getting the results correctly? (4 Replies)
Discussion started by: vadharah
4 Replies
9. Shell Programming and Scripting
I want to execute a shell script without ./ symbol.
For example:
./my_script ===== my_script (both of them can execute my script)
both of them are the same as result. (7 Replies)
Discussion started by: mehmetned
7 Replies
CRONTAB(5) File Formats Manual CRONTAB(5)
NAME
crontab - tables for driving cron
DESCRIPTION
A crontab file contains instructions to the cron(8) daemon of the general form: ``run this command at this time on this date''. Each user
has their own crontab, and commands in any given crontab will be executed as the user who owns the crontab. Uucp and News will usually
have their own crontabs, eliminating the need for explicitly running su(1) as part of a cron command.
Blank lines and leading spaces and tabs are ignored. Lines whose first non-space character is a pound-sign (#) are comments, and are
ignored. Note that comments are not allowed on the same line as cron commands, since they will be taken to be part of the command. Simi-
larly, comments are not allowed on the same line as environment variable settings.
An active line in a crontab will be either an environment setting or a cron command. An environment setting is of the form,
name = value
where the spaces around the equal-sign (=) are optional, and any subsequent non-leading spaces in value will be part of the value assigned
to name. The value string may be placed in quotes (single or double, but matching) to preserve leading or trailing blanks.
Several environment variables are set up automatically by the cron(8) daemon. SHELL is set to /bin/sh, and LOGNAME and HOME are set from
the /etc/passwd line of the crontab's owner. HOME and SHELL may be overridden by settings in the crontab; LOGNAME may not.
(Another note: the LOGNAME variable is sometimes called USER on BSD systems... on these systems, USER will be set also.)
In addition to LOGNAME, HOME, and SHELL, cron(8) will look at MAILTO if it has any reason to send mail as a result of running commands in
``this'' crontab. If MAILTO is defined (and non-empty), mail is sent to the user so named. If MAILTO is defined but empty (MAILTO=""), no
mail will be sent. Otherwise mail is sent to the owner of the crontab. This option is useful if you decide on /bin/mail instead of
/usr/lib/sendmail as your mailer when you install cron -- /bin/mail doesn't do aliasing, and UUCP usually doesn't read its mail.
The format of a cron command is very much the V7 standard, with a number of upward-compatible extensions. Each line has five time and date
fields, followed by a user name if this is the system crontab file, followed by a command. Commands are executed by cron(8) when the
minute, hour, and month of year fields match the current time, and when at least one of the two day fields (day of month, or day of week)
match the current time (see ``Note'' below). Note that this means that non-existant times, such as "missing hours" during daylight savings
conversion, will never match, causing jobs scheduled during the "missing times" not to be run. Similarly, times that occur more than once
(again, during daylight savings conversion) will cause matching jobs to be run twice.
cron(8) examines cron entries once every minute.
The time and date fields are:
field allowed values
----- --------------
minute 0-59
hour 0-23
day of month 1-31
month 1-12 (or names, see below)
day of week 0-7 (0 or 7 is Sun, or use names)
A field may be an asterisk (*), which always stands for ``first-last''.
Ranges of numbers are allowed. Ranges are two numbers separated with a hyphen. The specified range is inclusive. For example, 8-11 for
an ``hours'' entry specifies execution at hours 8, 9, 10 and 11.
Lists are allowed. A list is a set of numbers (or ranges) separated by commas. Examples: ``1,2,5,9'', ``0-4,8-12''.
Step values can be used in conjunction with ranges. Following a range with ``/<number>'' specifies skips of the number's value through the
range. For example, ``0-23/2'' can be used in the hours field to specify command execution every other hour (the alternative in the V7
standard is ``0,2,4,6,8,10,12,14,16,18,20,22''). Steps are also permitted after an asterisk, so if you want to say ``every two hours'',
just use ``*/2''.
Names can also be used for the ``month'' and ``day of week'' fields. Use the first three letters of the particular day or month (case
doesn't matter). Ranges or lists of names are not allowed.
The ``sixth'' field (the rest of the line) specifies the command to be run. The entire command portion of the line, up to a newline or %
character, will be executed by /bin/sh or by the shell specified in the SHELL variable of the cronfile. Percent-signs (%) in the command,
unless escaped with backslash (), will be changed into newline characters, and all data after the first % will be sent to the command as
standard input.
Note: The day of a command's execution can be specified by two fields -- day of month, and day of week. If both fields are restricted (ie,
aren't *), the command will be run when either field matches the current time. For example,
``30 4 1,15 * 5'' would cause a command to be run at 4:30 am on the 1st and 15th of each month, plus every Friday.
EXAMPLE CRON FILE
# use /bin/sh to run commands, no matter what /etc/passwd says
SHELL=/bin/sh
# mail any output to `paul', no matter whose crontab this is
MAILTO=paul
#
# run five minutes after midnight, every day
5 0 * * * $HOME/bin/daily.job >> $HOME/tmp/out 2>&1
# run at 2:15pm on the first of every month -- output mailed to paul
15 14 1 * * $HOME/bin/monthly
# run at 10 pm on weekdays, annoy Joe
0 22 * * 1-5 mail -s "It's 10pm" joe%Joe,%%Where are your kids?%
23 0-23/2 * * * echo "run 23 minutes after midn, 2am, 4am ..., everyday"
5 4 * * sun echo "run at 5 after 4 every sunday"
FILES
/etc/crontab System crontab file
SEE ALSO
cron(8), crontab(1)
EXTENSIONS
When specifying day of week, both day 0 and day 7 will be considered Sunday. BSD and ATT seem to disagree about this.
Lists and ranges are allowed to co-exist in the same field. "1-3,7-9" would be rejected by ATT or BSD cron -- they want to see "1-3" or
"7,8,9" ONLY.
Ranges can include "steps", so "1-9/2" is the same as "1,3,5,7,9".
Names of months or days of the week can be specified by name.
Environment variables can be set in the crontab. In BSD or ATT, the environment handed to child processes is basically the one from
/etc/rc.
Command output is mailed to the crontab owner (BSD can't do this), can be mailed to a person other than the crontab owner (SysV can't do
this), or the feature can be turned off and no mail will be sent at all (SysV can't do this either).
AUTHOR
Paul Vixie <paul@vix.com>
4th Berkeley Distribution 24 January 1994 CRONTAB(5)