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Full Discussion: How to detect and fix why crontab job is not executed?
Top Forums Shell Programming and Scripting How to detect and fix why crontab job is not executed? Post 303031880 by bakunin on Thursday 7th of March 2019 03:50:44 AM
Old 03-07-2019
Quote:
Originally Posted by Don Cragun
I don't remember the name of the log file that would contain the information about when the system changes states, but there has to be one
You probably mean the file wtmp and it is typically located in /var/tmp. It is NOT plain text file. Regardless of where it exactly is (placement may vary across different OSes, always somewhere in /var) you can prints its content in a formatted way by using the last command.

Note that in some (admittedly rather rare) cases the output of uptime can be misleading because in principle it is possible to tamper with the system date: start a server with the system clock set to 1980, change the date to 2019 and it may look as if the system is up nearly 40 years. The last command will print already written time stamps from the wtmp log so that it cannot be tampered with it this way.

I hope this helps.

bakunin
 

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LEARN ABOUT OPENDARWIN

who

WHO(1)							    BSD General Commands Manual 						    WHO(1)

NAME

     who -- display who is on the system

SYNOPSIS

     who [-HmqsTu] [am I] [file]

DESCRIPTION

     The who utility displays information about currently logged in users.  By default, this includes the login name, tty name, date and time of
     login and remote hostname if not local.

     The options are as follows:

     -H      Write column headings above the output.

     -m      Show information about the terminal attached to standard input only.

     -q      ``Quick mode'': List the names and number of logged in users in columns.  All other command line options are ignored.

     -s      Show the name, line and time fields only.	This is the default.

     -T      Indicate whether each user is accepting messages.	One of the following characters is written:

	     +	User is accepting messages.
	     -	User is not accepting messages.
	     ?	An error occurred.

     -u      Show idle time for each user in hours and minutes as hh:mm, '.' if the user has been idle less that a minute, and ``old'' if the user
	     has been idle more than 24 hours.

     am I    Equivalent to -m.

     By default, who gathers information from the file /var/run/utmp.  An alternate file may be specified which is usually /var/log/wtmp (or
     /var/log/wtmp.[0-6] depending on site policy as wtmp can grow quite large and daily versions may or may not be kept around after compression
     by ac(8)).  The wtmp file contains a record of every login, logout, crash, shutdown and date change since wtmp was last truncated or created.

     If /var/log/wtmp is being used as the file, the user name may be empty or one of the special characters '|', '}' and '~'.	Logouts produce an
     output line without any user name.  For more information on the special characters, see utmp(5).

ENVIRONMENT

     The COLUMNS, LANG, LC_ALL and LC_TIME environment variables affect the execution of who as described in environ(7).

FILES

     /var/run/utmp
     /var/log/wtmp
     /var/log/wtmp.[0-6]

DIAGNOSTICS

     The who utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     last(1), users(1), w(1), utmp(5)

STANDARDS

     The who utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY

     A who command appeared in Version 1 AT&T UNIX.

BSD
								    May 8, 2002 							       BSD
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