crontab.1 (2010 09)

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crontab(1) crontab(1)

NAME

crontab - user job ﬁle scheduler

SYNOPSIS

crontab [ﬁle]

crontab -e [username ]

crontab -l [username ]

crontab -r [username ]

DESCRIPTION

The

crontab command manages a crontab ﬁle for the user. You can use a crontab ﬁle to schedule jobs

that are executed automatically by

cron (see cron (1M)) on a regular basis. The command has four

forms:

crontab [file] Create or replace your crontab ﬁle by copying the speciﬁed ﬁle ,orstandard

input if ﬁle is omitted or

is speciﬁed as ﬁle, into the crontab directory,

/var/spool/cron/crontabs

. The name of your crontab ﬁle in the

crontab directory is the same as your effective user name. If the compart-

mentalization feature is enabled, crontab ﬁle may contain compartment

information.

crontab -e [username]

Edit a copy of the user’s crontab ﬁle, or create an empty ﬁle to edit if the

crontab ﬁle does not exist. When editing is complete, the ﬁle will be copied

into the crontab directory as the user’s crontab ﬁle. If the compartmentali-

zation feature is enabled, it only edits a copy of the user’s crontab ﬁle from

the compartment that the crontab ﬁles were created from.

crontab -l [username]

Lists the user’s crontab ﬁle. If the compartmentalization feature is

enabled, it only lists the crontab ﬁles from the compartment that the cron-

tab ﬁles were created from.

crontab -r [username]

Remove the user’s crontab ﬁle from the crontab directory. If the compart-

mentalization feature is enabled, it only removes the crontab ﬁles from the

compartment that the crontab ﬁles were created from.

Only a privileged user can use username following the

-e, -l,or-r options, to edit, list, or remove the

crontab ﬁle of the speciﬁed user.

The entries in a crontab ﬁle are lines of six ﬁelds each. The ﬁelds are separated by spaces or tabs. The

lines have the following format:

minute hour monthday month weekday command

The ﬁrst ﬁve are integer patterns that specify when the sixth ﬁeld, command, should be executed. They

can have the following ranges of values:

minute The minute of the hour,

0−59

hour The hour of the day, 0−23

monthday The day of the month, 1−31

month The month of the year, 1−12

weekday The day of the week, 0− 6, 0=Sunday

Each pattern can be either an asterisk (

*), meaning all legal values, or a list of elements separated by

commas. An element is either a number in the ranges shown above, or two numbers in the range

separated by a hyphen (meaning an inclusive range). Note that the speciﬁcation of days can be made in

two ﬁelds: monthday and weekday . If both are speciﬁed in an entry, they are cumulative. For example,

001,15*1command

runs command at midnight on the ﬁrst and ﬁfteenth of each month, as well as every Monday. To specify

days in only one ﬁeld, set the other ﬁeld to asterisk (

*). For example,

HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1

Summary of content (4 pages)

PAGE 1
crontab(1) crontab(1) NAME crontab - user job file scheduler SYNOPSIS crontab [file ] crontab -e [username ] crontab -l [username ] crontab -r [username ] DESCRIPTION The crontab command manages a crontab file for the user. You can use a crontab file to schedule jobs that are executed automatically by cron (see cron (1M)) on a regular basis.
PAGE 2
crontab(1) 0 crontab(1) 0 * * 1 command runs command only on Mondays. The sixth field, command (the balance of a line including blanks in a crontab file), is a string that is executed by the shell at the specified times. A percent character (%) in this field (unless escaped by a backslash (\)) is translated to a newline character, dividing the field into "lines". Only the first "line" (up to a % or end-of-line) of the command field is executed by the shell.
PAGE 3
crontab(1) /var/spool/cron/crontabs crontab(1) Directory containing the crontab files SEE ALSO sh(1), cron(1M), queuedefs(4), compartments(5), privileges(5).
PAGE 4
(Notes) A (Notes) cA 4 Hewlett-Packard Company −1− HP-UX 11i Version 3: September 2010