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Top Forums Shell Programming and Scripting How to create symlink for latest file only? Post 303033865 by solaris_1977 on Friday 12th of April 2019 04:57:39 PM
Old 04-12-2019
How to create symlink for latest file only?

Hello,

On Solaris 10, here are entries for logs in httpd.conf
Code:
ErrorLog "|/export/apache/apache-2.2.17/bin/rotatelogs -l -f /var/log/apache/error_log.%Y%m%d 86400"

It keeps creating daily logs with below names -
Code:
-rw-r--r--   1 root     root     1016747232 Apr  5 23:59 /var/log/apache/error_log.20190405
-rw-r--r--   1 root     root     946721391 Apr  6 23:59 /var/log/apache/error_log.20190406
-rw-r--r--   1 root     root     1092546540 Apr  7 23:59 /var/log/apache/error_log.20190407
-rw-r--r--   1 root     root     1172486303 Apr  8 23:59 /var/log/apache/error_log.20190408
-rw-r--r--   1 root     root     909466871 Apr  9 23:59 /var/log/apache/error_log.20190409
-rw-r--r--   1 root     root     916731172 Apr 10 23:59 /var/log/apache/error_log.20190410
-rw-r--r--   1 root     root     785326845 Apr 11 23:59 /var/log/apache/error_log.20190411
-rw-r--r--   1 root     root     463003111 Apr 12 13:38 /var/log/apache/error_log.20190412

I want to create a symlink 'error_log' and that should point to latest log file. One idea is, to create two cronjobs for 00:00 midnight, something like this
Code:
00 00 * * * ln -s /var/log/apache/error_log.20190412 /var/log/apache/error_log
59 00 * * * unlink /var/log/apache/error_log

But how will I tell cron, to pick only latest error_log.xxxxxx ? Is it possible ?

Thanks
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explain_symlink_or_die(3)				     Library Functions Manual					 explain_symlink_or_die(3)

NAME
explain_symlink_or_die - make a new name for a file and report errors SYNOPSIS
#include <libexplain/symlink.h> void explain_symlink_or_die(const char *oldpath, const char *newpath); DESCRIPTION
The explain_symlink_or_die function is used to call the symlink(2) system call. On failure an explanation will be printed to stderr, obtained from explain_symlink(3), and then the process terminates by calling exit(EXIT_FAILURE). This function is intended to be used in a fashion similar to the following example: explain_symlink_or_die(oldpath, newpath); oldpath The oldpath, exactly as to be passed to the symlink(2) system call. newpath The newpath, exactly as to be passed to the symlink(2) system call. Returns: This function only returns on success. On failure, prints an explanation and exits. SEE ALSO
symlink(2) make a new name for a file explain_symlink(3) explain symlink(2) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2008 Peter Miller explain_symlink_or_die(3)
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