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Full Discussion: How to create symlink for latest file only?
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
Old 04-19-2019
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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LEARN ABOUT OSX

perlio::via::symlink

symlink(3)						User Contributed Perl Documentation						symlink(3)

NAME

       PerlIO::via::symlink - PerlIO layers for create symlinks

SYNOPSIS

	open $fh, '>:via(symlink)', $fname;
	print $fh "link foobar";
	close $fh;

DESCRIPTION

       The PerlIO layer "symlink" allows you to create a symbolic link by writing to the file handle.

       You need to write C"link $name" to the file handle. If the format does not match, "close" will fail with EINVAL.

TEST COVERAGE

	----------------------------------- ------ ------ ------ ------ ------ ------
	File				      stmt branch   cond    sub   time	total
	----------------------------------- ------ ------ ------ ------ ------ ------
	blib/lib/PerlIO/via/symlink.pm	     100.0  100.0    n/a  100.0  100.0	100.0
	Total				     100.0  100.0    n/a  100.0  100.0	100.0
	----------------------------------- ------ ------ ------ ------ ------ ------

AUTHORS

       Chia-liang Kao <clkao@clkao.org>

COPYRIGHT

       Copyright 2004-2005 by Chia-liang Kao <clkao@clkao.org>.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

       See <http://www.perl.com/perl/misc/Artistic.html>

perl v5.16.2							    2005-03-01								symlink(3)
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