I stopped using relative paths and find long time ago (unless doing interactive work).
This approach is much safer and easier to maintain :
Code:
cd $ABSOLUTE_PATH_DIR && find . <further options and operands> || exit 1
cd -
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 :
Code:
set -x
#DIR=/home/user # someone decided to comment this line or makes a mistake.
# more lines of code, hundreds of them
cd $DIR/ && find . -type f .. || exit 1 # This will expand into cd / && find .. # enough said
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))
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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
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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
$
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$
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Hi,
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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
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Discussion started by: Rajkumar Gandhi
1 Replies
LEARN ABOUT POSIX
queuedefs
queuedefs(4) File Formats queuedefs(4)NAME
queuedefs - queue description file for at, batch, and cron
SYNOPSIS
/etc/cron.d/queuedefs
DESCRIPTION
The queuedefs file describes the characteristics of the queues managed by cron(1M). Each non-comment line in this file describes one queue.
The format of the lines are as follows:
q.[njobj][nicen][nwaitw]
The fields in this line are:
q The name of the queue. a is the default queue for jobs started by at(1); b is the default queue for jobs started by batch (see
at(1)); c is the default queue for jobs run from a crontab(1) file.
njob The maximum number of jobs that can be run simultaneously in that queue; if more than njob jobs are ready to run, only the first
njob jobs will be run, and the others will be run as jobs that are currently running terminate. The default value is 100.
nice The nice(1) value to give to all jobs in that queue that are not run with a user ID of super-user. The default value is 2.
nwait The number of seconds to wait before rescheduling a job that was deferred because more than njob jobs were running in that job's
queue, or because the system-wide limit of jobs executing has been reached. The default value is 60.
Lines beginning with # are comments, and are ignored.
EXAMPLES
Example 1: A sample file.
#
#
a.4j1n
b.2j2n90w
This file specifies that the a queue, for at jobs, can have up to 4 jobs running simultaneously; those jobs will be run with a nice value
of 1. As no nwait value was given, if a job cannot be run because too many other jobs are running cron will wait 60 seconds before trying
again to run it.
The b queue, for batch(1) jobs, can have up to 2 jobs running simultaneously; those jobs will be run with a nice(1) value of 2. If a job
cannot be run because too many other jobs are running, cron(1M) will wait 90 seconds before trying again to run it. All other queues can
have up to 100 jobs running simultaneously; they will be run with a nice value of 2, and if a job cannot be run because too many other jobs
are running cron will wait 60 seconds before trying again to run it.
FILES
/etc/cron.d/queuedefs queue description file for at, batch, and cron.
SEE ALSO at(1), crontab(1), nice(1), cron(1M)SunOS 5.10 1 Mar 1994 queuedefs(4)
10-22-2017
