Logger for shell script, working on Bash and Zsh.

This includes functions of debug, info(information), notice(notification), warn(warning) and err(error). Each output is formatted with date-time and colored by each color definition.

These color codes are removed when the output is passed to a pipe or written into files.

• Use as interactive command

• Each output and color

• Traceback at error

Installation

You can use an install script on the web like:

$ curl -fsSL https://raw.github.com/rcmdnk/shell-logger/install/install.sh| sh

This will install scripts to /usr/etc and you may be asked root password.

If you want to install other directory, do like:

$ curl -fsSL https://raw.github.com/rcmdnk/shell-logger/install/install.sh|  prefix=~/usr/local/ sh

On Mac, you can install etc/shell-logger by Homebrew:

$ brew tap rcmdnk/rcmdnkpac/shell-logger

The file will be installed in $(brew --prefix)/etc (normally /usr/local/etc).

Otherwise download shell-logger and place it where you like.

Once shell-logger is installed, source it in your .bashrc or .zshrc like:

source /path/to/shell-logger

Usage

In your script, source shell-logger:

source /path/to/shell-logger

Then, you can use such info or err command in your script like:

#!/bin/bash

source /usr/local/etc/shell-logger

test_command
ret=$?
if [ $ret -eq 0 ];then
  info Command succeeded.
else
  err Command failed!
fi

Each level has each functions:

LEVEL	Functions
DEBUG	debug
INFO	info, information
NOTICE	notice, notification
WARNING	warn, warning
ERROR	err, error

Options

Variable Name	Description	Default
LOGGER_DATE_FORMAT	Output date format.	'%Y/%m/%d %H:%M:%S'
LOGGER_LEVEL	0: DEBUG, 1: INFO, 2: NOTICE, 3: WARN, 4: ERROR	1
LOGGER_STDERR_LEVEL	For levels greater than equal this level, outputs will go stderr.	4
LOGGER_DEBUG_COLOR	Color for DEBUG	3 (Italicized. Some terminal shows it as color inversion)
LOGGER_INFO_COLOR	Color for INFO	"" (Use default output color)
LOGGER_NOTICE_COLOR	Color for NOTICE	36 (Front color cyan)
LOGGER_WARNING_COLOR	Color for WARNING	33 (Front color yellow)
LOGGER_ERROR_COLOR	Color for ERROR	31 (Front color red)
LOGGER_COLOR	Color mode: never->Always no color. auto->Put color only for terminal output. always->Always put color.	auto
LOGGER_LEVELS	Names printed for each level. Need 5 names.	("DEBUG" "INFO" "NOTICE" "WARNING" "ERROR")
LOGGER_SHOW_TIME	Show time information	1
LOGGER_SHOW_FILE	Show file/line information	1
LOGGER_SHOW_LEVEL	Show level	1
LOGGER_ERROR_RETURN_CODE	Error reutrn code of err/error	100
LOGGER_ERROR_TRACE	If 1, error trace back is shown by err/error	1
LOGGER_FILE_OUTPUT	If set, output is written to the file.	"" (Not output file is defined)
LOGGER_FILE_ONLY	If 1 and LOGGER_FILE_OUTPUT is set, not output will be given to stdout/stderr.	0
LOGGER_FILE_LEVEL	Output level for the file.	Same as LOGGER_LEVEL
LOGGER_FILE_APPEND	If 1, output is appended to the file. Otherwise, the file is overwritten.	0

About colors, you can find the standard definitions in Standard ECMA-48 (p61, p62).

Normal are:

Number	Color definition
30	black display
31	red display
32	green display
33	yellow display
34	blue display
35	magenta display
36	cyan display
37	white display
40	black background
41	red background
42	green background
43	yellow background
44	blue background
45	magenta background
46	cyan background
47	white background

You can set display (letter's color) and background in the same time. For example, if you want to use red background and white front color for error output, set:

_LOGGER_ERROR_COLOR="37;41"

You can easily check colors by escseqcheck.