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postlog - Postfix-compatible logging utility
postlog [-iv] [-c config_dir] [-p priority] [-t tag] [text...]
The postlog(1) command implements a Postfix-compatible logging inter-
face for use in, for example, shell scripts.
By default, postlog(1) logs the text given on the command line as one
record. If no text is specified on the command line, postlog(1) reads
from standard input and logs each input line as one record.
By default, logging is sent to syslogd(8) or postlogd(8); when the
standard error stream is connected to a terminal, logging is sent there
The following options are implemented:
Read the main.cf configuration file in the named directory
instead of the default configuration directory.
Include the process ID in the logging tag. This flag is ignored
as of Postfix 3.4, where the PID is always included.
-p priority (default: info)
Specifies the logging severity: info, warn, error, fatal, or
panic. With Postfix 3.1 and later, the program will pause for 1
second after reporting a fatal or panic condition, just like
other Postfix programs.
-t tag Specifies the logging tag, that is, the identifying name that
appears at the beginning of each logging record. A default tag
is used when none is specified.
-v Enable verbose logging for debugging purposes. Multiple -v
options make the software increasingly verbose.
The postlog(1) command is designed to run with set-groupid privileges,
so that it can connect to the postlogd(8) daemon process (Postfix 3.7
and later; earlier implementations of this command must not have
set-groupid or set-userid permissions).
Directory with the main.cf file.
The following main.cf parameters are especially relevant to this pro-
The text below provides only a parameter summary. See postconf(5) for
more details including examples.
config_directory (see 'postconf -d' output)
The default location of the Postfix main.cf and master.cf con-
import_environment (see 'postconf -d' output)
The list of environment parameters that a privileged Postfix
process will import from a non-Postfix parent process, or
name=value environment overrides.
The syslog facility of Postfix logging.
syslog_name (see 'postconf -d' output)
A prefix that is prepended to the process name in syslog
records, so that, for example, "smtpd" becomes "prefix/smtpd".
Available in Postfix 3.4 and later:
The name of an optional logfile that is written by the Postfix
The name of the postlogd(8) service entry in master.cf.
postconf(5), configuration parameters
postlogd(8), Postfix logging
syslogd(8), system logging
The Secure Mailer license must be distributed with this software.
The postlog(1) command was introduced with Postfix version 3.4.
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
111 8th Avenue
New York, NY 10011, USA