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Top Forums Shell Programming and Scripting How to create symlink for latest file only? Post 303034132 by solaris_1977 on Friday 19th of April 2019 03:03:07 AM
May be I missed to copy correct content. Here I tried it again. I made two attemps. One job created for 23:58 and another time at 00:01
Code:
-bash-3.2# crontab -l | tail -2
58 23 * * * cd /var/log/apache && rm -f error_log && ln -s $(ls -r *error_log.* | head -1) error_log
01 00 * * * cd /var/log/apache && rm -f error_log && ln -s $(ls -r *error_log.* | head -1) error_log
-bash-3.2#
-bash-3.2# tail -f  /var/cron/log
<  root 28826 c Thu Apr 18 16:13:00 2019 rc=2
>  CMD: unlink /var/log/apache/error_log
>  root 29897 c Thu Apr 18 16:14:00 2019
<  root 29897 c Thu Apr 18 16:14:00 2019 rc=255
>  CMD:  cd /var/log/apache && rm -f error_log && ln -s $(ls -r *error_log.* | head -1) error_log
>  root 26545 c Thu Apr 18 23:58:00 2019
<  root 26545 c Thu Apr 18 23:58:00 2019 rc=2
>  CMD: cd /var/log/apache && rm -f error_log && ln -s $(ls -r *error_log.* | head -1) error_log
>  root 3093 c Fri Apr 19 00:01:00 2019
<  root 3093 c Fri Apr 19 00:01:00 2019 rc=2
^C
-bash-3.2# ls -l /var/log/apache/error_log
/var/log/apache/error_log: No such file or directory
-bash-3.2#

But if I run command manually, it is able to create
Code:
-bash-3.2# cd /var/log/apache && rm -f error_log && ln -s $(ls -r *error_log.* | head -1) error_log
-bash-3.2# ls -l /var/log/apache/error_log
lrwxrwxrwx   1 root     root          18 Apr 19 00:03 /var/log/apache/error_log -> error_log.20190419
-bash-3.2# rm -f error_log
-bash-3.2#

To test, if cron is working with root, I made another entry of date command
Code:
32 00 * * * date>/tmp/date.out

-bash-3.2# tail -f  /var/cron/log
<  root 20623 c Fri Apr 19 00:20:22 2019
>  CMD: date > /tmp/date.out
>  root 10651 c Fri Apr 19 00:26:00 2019
<  root 10651 c Fri Apr 19 00:26:00 2019
>  CMD: cd /var/log/apache && rm -f error_log && ln -s $(ls -r *error_log.* | head -1) error_log
>  root 12318 c Fri Apr 19 00:27:00 2019
<  root 12318 c Fri Apr 19 00:27:00 2019 rc=2
>  CMD: cd /var/log/apache && rm -f error_log && ln -s $(ls -r *error_log.* | head -1) error_log
>  root 13871 c Fri Apr 19 00:28:00 2019
<  root 13871 c Fri Apr 19 00:28:00 2019 rc=2
>  CMD: cd /var/log/apache && rm -f error_log && ln -s $(ls -r *error_log.* | head -1) error_log
>  root 23263 c Fri Apr 19 00:31:00 2019
<  root 23263 c Fri Apr 19 00:31:00 2019 rc=2
>  CMD: date>/tmp/date.out
>  root 25056 c Fri Apr 19 00:32:00 2019
<  root 25056 c Fri Apr 19 00:32:00 2019
^C
You have new mail in /var/mail/root
-bash-3.2# ls -l /tmp/date.out
-rw-r--r--   1 root     root          29 Apr 19 00:32 /tmp/date.out
-bash-3.2#

Not sure if "rc=2" is giving some indication

Last edited by solaris_1977; 04-19-2019 at 05:49 AM..
 
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lucurr(1M)																lucurr(1M)

NAME
lucurr - display the name of the active boot environment SYNOPSIS
/usr/sbin/lucurr [-l error_log] [-m mount_point] [-o outfile] [-X] DESCRIPTION
The lucurr command is part of a suite of commands that make up the Live Upgrade feature of the Solaris operating environment. See live_upgrade(5) for a description of the Live Upgrade feature. The lucurr command displays the name of the currently running boot environment (BE). If no BEs are configured on the system, lucurr dis- plays the message "No Boot Environments are defined". Note that lucurr reports only the name of the current BE, not the BE that will be active upon the next reboot. Use lustatus(1M) or luactivate(1M) for this information. The lucurr command requires root privileges. OPTIONS
The lucurr command has the following options: -l error_log Error and status messages are sent to error_log, in addition to where they are sent in your current environment. -m mount_point Returns the name of the BE that owns mount_point, where mount_point is the mount point of a BE's root file system. This can be a mount point of the current BE or the mount point of a BE other than the current BE. If the latter, the file system of the BE must have been mounted with lumount(1M) or mount(1M) before entering this option. -o outfile All command output is sent to outfile, in addition to where it is sent in your current environment. -X Enable XML output. Characteristics of XML are defined in DTD, in /usr/share/lib/xml/dtd/lu_cli.dtd.<num>, where <num> is the version number of the DTD file. EXIT STATUS
The following exit values are returned: 0 Successful completion. >0 An error occurred. FILES
/etc/lutab list of BEs on the system /usr/share/lib/xml/dtd/lu_cli.dtd.<num> Live Upgrade DTD (see -X option) ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWluu | +-----------------------------+-----------------------------+ SEE ALSO
lu(1M), luactivate(1M), lucancel(1M), lucompare(1M), lucreate(1M), ludelete(1M), ludesc(1M), lufslist(1M), lumake(1M), lumount(1M), lure- name(1M), lustatus(1M), luupgrade(1M), lutab(4), attributes(5), live_upgrade(5) SunOS 5.10 24 Jan 2002 lucurr(1M)

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