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Full Discussion: prepend timestamp to continiously updating log file
Top Forums Shell Programming and Scripting prepend timestamp to continiously updating log file Post 302719973 by rajkumarme_1 on Tuesday 23rd of October 2012 11:14:02 AM
Old 10-23-2012
prepend timestamp to continiously updating log file
Hi,

I have a process which outputs to a log.

Below is the code snippet:

Code:
 
process   &> $LOGFILE&



The log file keeps on updating whenever a transaction is processed.
The log file has a time stamp added so every time I kill the process and start the process a new log file is created with latest time stamp.

Because the log file would be growing forever, I would like to prepend time stamp for each line in the log file. I used the below way but instead of writing the log every time a transaction is processed, the time stamp is added to each line in the log after the kill the process.

Code:
 
process  | sed "s/^/$(date)/" &> $LOGFILE&



Can you let me know how do I prepend time stamp inside the log in real time?

Thank you!
 

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LEARN ABOUT MOJAVE

vconsole.conf

VCONSOLE.CONF(5)                                                   vconsole.conf                                                  VCONSOLE.CONF(5)

NAME

       vconsole.conf - configuration file for the virtual console

SYNOPSIS

       /etc/vconsole.conf

DESCRIPTION

       The /etc/vconsole.conf file configures the virtual console, i.e. keyboard mapping and console font.

       The basic file format of the vconsole.conf is a newline-separated list environment-like shell-compatible variable assignments. It is
       possible to source the configuration from shell scripts, however, beyond mere variable assignments no shell features are supported,
       allowing applications to read the file without implementing a shell compatible execution engine.

       Note that the kernel command line options vconsole.keymap=, vconsole.keymap.toggle=, vconsole.font=, vconsole.font.map=,
       vconsole.font.unimap= may be used to override the console settings at boot.

       Depending on the operating system other configuration files might be checked for configuration of the virtual console as well, however only
       as fallback.

OPTIONS

       The following options are understood:

       KEYMAP=, KEYMAP_TOGGLE=
           Configures the key mapping table of for they keyboard.  KEYMAP= defaults to us if not set. The KEYMAP_TOGGLE= can be used to configured
           a second toggle keymap and is by default unset.

       FONT=, FONT_MAP=, FONT_UNIMAP=
           Configures the console font, the console map and the unicode font map.  FONT= defaults to latarcyrheb-sun16.

EXAMPLE

       Example 1. German keyboard and console

       /etc/vconsole.conf:

           KEYMAP=de-latin1
           FONT=latarcyrheb-sun16

SEE ALSO

       systemd(1), loadkeys(1), setfont(8), locale.conf(5)

AUTHOR

       Lennart Poettering <lennart@poettering.net>
           Developer

systemd                                                             10/07/2013                                                    VCONSOLE.CONF(5)
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