I stopped using relative paths and find long time ago (unless doing interactive work).
This approach is much safer and easier to maintain :
This way, an error if directory does not exist or permission is denied is printed on stderr.
You will see this error in local mail if running in crontab (if no stderr redirection has been made inside crontab line).
Do not use trailing slashes with directory variables.
Example of things going haywire when doing that :
Decommission -> create a virtual machine out of it - if you can, not some obscure OS/hardware
Good things to do before decommission are (if you cannot virtualize it in lab) :
Copy all crontab and at entries and related scripts used in those.
Issue a mount, output into a file and copy it somewhere safe.
Issue a share into a file (if NFS or other network file systems are exported on the box).
FC and LAN topology should be written down (WWNS, lan port configuration etc.)
/etc/passwd, /etc/shadow, /etc/group, /etc/hosts (perhaps more depending) files should be copied.
All above is done in couple of minutes or less, and is golden for post mortem analysis.
Hope that helps
Regards
Peasant.
Last edited by rbatte1; 10-23-2017 at 07:34 AM..
Reason: Converted to formatted numbered list with LIST=1 tags
These 2 Users Gave Thanks to Peasant For This Post:
I have a backup script that is suppose to run every night of the week, but it never does, it starts to run. The way I can tell is that the dates on dump_log are changing to when the script runs. If I look in the cron log file is shows
! > root 506342 cr /etc/back_up Fri Aug 5 10:30:00... (2 Replies)
Hello
i have a shell script. it is running fine when i manually run at command prompt using following command
./script_file
but while running shell script from crontab, it is giving error in each line. (2 Replies)
Hi,
Could any one help me to extract data from a report.
I would like to get the two lines which are just below the separations
I have a report like this
--------------------------------------------------------------------------
Pid Command Inuse Pin Pgsp Virtual... (2 Replies)
I am adding a piece of code which adds entry in crontab ((in brown color))
\crontab -l > $tmpfile
echo "Removing the cleanProcess entry if it already existed.."
grep -v "cleanProcess.sh" $tmpfile > $newtmpfile
lcnt=`grep -c "cleanProcess.sh" $tmpfile`
echo... (4 Replies)
Executive summary:
Code (posted below) cores in AIX 5.3, despite being compiled and run successfully on several other operating systems. Code is attempting to verify that pthread_mutex_lock can be successfully aborted by siglongjmp. I do not believe this is an unreasonable requirement.
If... (1 Reply)
I am facing a strange issue while running a script(eg A) from the crontab entry
the script calls one more script(eg B) within it
now when i run the script A manually(with nohup) it also executes the script B (embedded inside it) as expected.
but when i run the script A from the crontab entry... (7 Replies)
Helo .
I have 2.6.13-1.1526_FC4smp here.
I am trying to make crontab execute my simple shell script, but noting happens.
here is how i am testing this :
$ pwd
/home/oracle
$ ls -l two*
ls: two*: No such file or directory
$
$ crontab -e
crontab: installing new crontab
$
$ crontab... (7 Replies)
Hi,
I was mucking around with Maven for Eclipse the other day, working on an audio visual project and I was struck by how cool the terminal executing massive amounts of commands is.
I have an odd request. I was wondering if people knew of a terminal script that outputed a lot of data,... (0 Replies)
hi,
i have schduled a job through crontab, but it is not getting executed.
bash-3.2$ crontab -l
# Monthly Download (mm hh DD MM format)
35 05 01 04 * /home/ftpsrp/srpftp1/download/ofrdb/scripts/load_ofrdb.sh crr.sh
here is the permission of the .sh files
-rwxr--r-- 1 ftpsrp srp ... (7 Replies)
I'm having a shell script which has to be run only once at the specified time.
Shell script is like following,
#!/bin/bash
db2 connect to XXX > connection_status.txt
This script is scheduled in crontab as following,
50 4 8 5 0 sh script.sh
scheduled script is run at the specified time... (1 Reply)
Discussion started by: Rajkumar Gandhi
1 Replies
LEARN ABOUT PLAN9
crontab
CRONTAB(1) General Commands Manual CRONTAB(1)NAME
crontab - maintain crontab files for individual users (Vixie Cron)
SYNOPSIS
crontab [ -u user ] file
crontab [ -u user ] [ -i ] { -e | -l | -r }
DESCRIPTION
crontab is the program used to install, deinstall or list the tables used to drive the cron(8) daemon in Vixie Cron. Each user can have
their own crontab, and though these are files in /var/spool/cron/crontabs, they are not intended to be edited directly.
If the /etc/cron.allow file exists, then you must be listed (one user per line) therein in order to be allowed to use this command. If the
/etc/cron.allow file does not exist but the /etc/cron.deny file does exist, then you must not be listed in the /etc/cron.deny file in order
to use this command.
If neither of these files exists, then depending on site-dependent configuration parameters, only the super user will be allowed to use
this command, or all users will be able to use this command.
If both files exist then /etc/cron.allow takes precedence. Which means that /etc/cron.deny is not considered and your user must be listed
in /etc/cron.allow in order to be able to use the crontab.
Regardless of the existance of any of these files, the root administrative user is always allowed to setup a crontab. For standard Debian
systems, all users may use this command.
If the -u option is given, it specifies the name of the user whose crontab is to be used (when listing) or modified (when editing). If this
option is not given, crontab examines "your" crontab, i.e., the crontab of the person executing the command. Note that su(8) can confuse
crontab and that if you are running inside of su(8) 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. See the note under DEBIAN SPECIFIC below.
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. If neither of the environment variables is defined, then the default
editor /usr/bin/editor is used.
The -i option modifies the -r option to prompt the user for a 'y/Y' response before actually removing the crontab.
DEBIAN SPECIFIC
The "out-of-the-box" behaviour for crontab -l is to display the three line "DO NOT EDIT THIS FILE" header that is placed at the beginning
of the crontab when it is installed. The problem is that it makes the sequence
crontab -l | crontab -
non-idempotent -- you keep adding copies of the header. This causes pain to scripts that use sed to edit a crontab. Therefore, the default
behaviour of the -l option has been changed to not output such header. You may obtain the original behaviour by setting the environment
variable CRONTAB_NOHEADER to 'N', which will cause the crontab -l command to emit the extraneous header.
SEE ALSO crontab(5), cron(8)FILES
/etc/cron.allow
/etc/cron.deny
/var/spool/cron/crontabs
There is one file for each user's crontab under the /var/spool/cron/crontabs directory. Users are not allowed to edit the files under that
directory directly to ensure that only users allowed by the system to run periodic tasks can add them, and only syntactically correct
crontabs will be written there. This is enforced by having the directory writable only by the crontab group and configuring crontab com-
mand with the setgid bid set for that specific group.
STANDARDS
The crontab command conforms to IEEE Std1003.2-1992 (``POSIX''). This new command syntax differs from previous versions of Vixie Cron, as
well as from the classic SVR3 syntax.
DIAGNOSTICS
A fairly informative usage message appears if you run it with a bad command line.
cron requires that each entry in a crontab end in a newline character. If the last entry in a crontab is missing the newline, cron will
consider the crontab (at least partially) broken and refuse to install it.
AUTHOR
Paul Vixie <paul@vix.com> is the author of cron and original creator of this manual page. This page has also been modified for Debian by
Steve Greenland, Javier Fernandez-Sanguino and Christian Kastner.
4th Berkeley Distribution 19 April 2010 CRONTAB(1)