logger.sh

#!/bin/bash
SCRIPT_LOG=/var/log/mycustom.log
touch $SCRIPT_LOG

function SCRIPTENTRY(){
    timestamp=$(date +"%F %T")
    script_name=$(basename "$0")
    script_name="${script_name%.*}"
    echo "[$timestamp] [DEBUG]  > $script_name $FUNCNAME[0]" >> $SCRIPT_LOG
}

function SCRIPTEXIT(){
    script_name=$(basename "$0")
    script_name="${script_name%.*}"
    echo "[$timestamp] [DEBUG]  < $script_name $FUNCNAME[0]" >> $SCRIPT_LOG
}

function ENTRY(){
    local cfn="${FUNCNAME[1]}"
    timestamp=$(date +"%F %T")
    echo "[$timestamp] [DEBUG]  > $cfn $FUNCNAME[0]" >> $SCRIPT_LOG
}

function EXIT(){
    local cfn="${FUNCNAME[1]}"
    timestamp=$(date +"%F %T")
    echo "[$timestamp] [DEBUG]  < $cfn $FUNCNAME[0]" >> $SCRIPT_LOG
}


function INFO(){
    local function_name="${FUNCNAME[1]}"
    local msg="$1"
    timestamp=$(date +"%F %T")
    echo "[$timestamp] [INFO]  $msg" >> $SCRIPT_LOG
}


function DEBUG(){
    local function_name="${FUNCNAME[1]}"
    local msg="$1"
    timestamp=$(date +"%F %T")
    echo "[$timestamp] [DEBUG]  $msg" >> $SCRIPT_LOG
}

function ERROR(){
    local function_name="${FUNCNAME[1]}"
    local msg="$1"
    timestamp=$(date +"%F %T")
    echo "[$timestamp] [ERROR]  $msg" >> $SCRIPT_LOG
}

#### Usage: ####

#!/bin/bash
#source ./logger.sh
#SCRIPTENTRY
#function testFunction(){
#    ENTRY
#    DEBUG "Argument 1: $1, Argument 2: $2"
#    INFO "something something"
#    EXIT
#}
#INFO "Updating user details..."
#testFunction "test" "0123"
#SCRIPTEXIT