Every Operating System has Librarys. Most of them gives you the opportunity to do more ore to write less code. inti-functions is one of these Librarys but...
What is init-functions and how to use it?
In Linux you are able to use init-functions to manage deamons and protocol in a colored & uniform way. This is way easier to handle than recolor every answer.
It is stored in /lib/lsb/
under the name init-functions
.
Here you have an Example:
#!/bin/bash
source /lib/lsb/init-functions # Importing init-functions - log messages
# Use for importing other scripts ore else: "source" / "."
# Use at the beginning of the path "/" to say that the path has to start from the root directory
log_success_msg "Starting test.sh" || true
echo
log_action_msg "Info message" || true # Info message
log_success_msg "Checking Files" || true # Success message
log_warning_msg "Free storage is under 10%" || true # Warning message
log_failure_msg "Starting unknown script files" || false # Failure message
echo
log_end_msg 0 || true # End message - success - resetting the line above -> log_daemon_msg
log_end_msg 1 || true # End message - failure - resetting the line above -> log_daemon_msg
log_end_msg 255 || true # End message - warning - resetting the line above -> log_daemon_msg
echo
log_progress_msg "copying file 2123" # One of the line resetting comands - progress
echo
echo
log_daemon_msg "Integrate files" || true
sleep 2
log_end_msg 0 || true
log_daemon_msg "Checkt if the directory 4234 exist" || true
sleep 2
log_end_msg 1 || true
log_daemon_msg "Storage space checking " || true
sleep 2
log_end_msg 255 || true
echo
echo
log_daemon_msg "Checking Filestorage" || true
sleep 1
log_progress_msg "Checking File 1" || true
sleep 1
log_progress_msg "Checking File 2" || true
sleep 1
log_progress_msg "Checking File 3" || true
sleep 1
log_progress_msg "Checking File 4" || true
sleep 1
log_end_msg 0 || true
echo
#---------------------------------------------------------------# Method 1 - not working for commands that are self responding
$checker # A variable that doesn't exist. To trigger an error code
log_daemon_msg "Check if the last command was an Error" || true
if [ "$?" -eq "0" ] # "$?" is the errorcode number of the last command. | 0 = There was no Errors | 1 = Error code 1
then
log_end_msg 0 || true
else
log_end_msg 1 || true
echo " There went something wrong. see log"
fi
#---------------------------------------------------------------# A way to check if a directory exist
#if [ -d "/opt/scripts" ] # Check if directory exist - example at this line: if directory /opt/scripts exist
# -d = check if the following directory exitst
# -a = check if the following file exsist
#if [ ! -d "/opt/scripts" ] # ! is a negativ operator - example at this line: if directory /opt/scripts NOT exist
# You can actually use the ! operator anywhere
#---------------------------------------------------------------# Method 2 - working for self responding commands. but the log_daemon_msg ist not working so we take log_succes/warning/failure_msg
echo
echo "type in: false / true / (nothing)"
read var1
case $var1 in # Check if variable var1 is true
true)
log_success_msg "Check if var1 is true" || true
;;
false)
log_warning_msg "Check if var1 is true" || true
echo -e " \e[33mvar1 is false.\e[0m"
;;
*)
log_failure_msg "Check if var1 is true" || true
echo -e " \e[31mthere was no input in the read statment.\e[0m"
;;
esac