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2012-02-20

basic sh bash script starter stub

#!/bin/bash
umask 000 ; 
# print the commands 
# set -x
# exit the script if any statement returns a non-true return value
set -e 
 
 
setVars(){
        export PATH=/cygdrive/c/cygwin/bin/:$PATH
        MyDir=`dirname $(readlink -f $0)`
        Tmp="$MyDir/tmp.$$"
        mkdir -p $Tmp                #create the tmp dir if it does not exist 
        ( set -o posix ; set ) >$Tmp/variables.before 
        MyName=`basename $0`
        IniFile="$MyDir/$MyName.`hostname`.conf"
        IniSection=MainSection
        LogFile="$MyDir/$MyName.log"
        # get the machine / host specific configuration 
        parseIniFile
        #source $0
        ( set -o posix ; set ) >$Tmp/variables.after
        wlog " Using the following vars :"
        cmd="comm -3 $Tmp/variables.before $Tmp/variables.after"
        runCmdAndLog $cmd
        rm -f $Tmp/variables.before $Tmp/variables.after
        rm -f $Tmp/variables.before $Tmp/variables.before    
}
#eof function setVars
 
 
parseIniFile(){
    eval `sed -e 's/[[:space:]]*\=[[:space:]]*/=/g' \
        -e 's/;.*$//' \
        -e 's/[[:space:]]*$//' \
        -e 's/^[[:space:]]*//' \
        -e "s/^\(.*\)=\([^\"']*\)$/\1=\"\2\"/" \
       < $IniFile \
        | sed -n -e "/^\[$IniSection\]/,/^\s*\[/{/^[^;].*\=.*/p;}"`
}
#eof function parseIniFile
 
# call by runCmdAndLog $cmd
runCmdAndLog(){
                cmd="$*" ; 
                Msg=$($cmd 2>&1)
                [ $? -eq 0 ]  || wlog "ERROR : Failed to run the $cmd command with $Msg output!!!"
                wlog " DEBUG : $Msg"
}
#eof function runCmdAndLog
 
 
#call by runCmdOrExit $cmd
runCmdOrExit(){
                cmd="$*" ; 
                Msg=$($cmd 2>&1)
                [ $? -eq 0 ] || Exit "ERROR : FATAL : Failed to run the $cmd command with $Msg output!!!"
                wlog " DEBUG : $Msg"
}
#eof function runCmdOrExit
 
# echo passed params and print them to a log file
wlog(){
        # check terminal if exists echo 
        test -t 1 && echo "`date +%Y.%m.%d-%H:%M:%S` [$$] $*"
        # check LogFile and 
        test -z $LogFile || {
          echo "`date +%Y.%m.%d-%H:%M:%S` [$$] $*" >> $LogFile
        } #eof test
 } 
# eof function wlog 
 
 
# exit with passed status and message
Exit(){
        ExitStatus=0
        case $1 in
            [0-9]) ExitStatus="$1"; shift 1;;
    esac
        Msg="$*"
        test "$ExitStatus" = "0" || Msg="ERROR: $Msg"
        wlog "$Msg"
        exit $ExitStatus
}
#eof function Exit
 
# the main function called 
main(){
    setVars
}
#eof function main
 
# Action !!!
main
 
# Purpose:
# To provide an easy starting template for writing bash and sh scripts
# having the following features: 
# - prints the set in the script variables
# - separation of host specific vars into $0.`hostname`.conf file
# - wlog function for both xterm and log file printing
# - 
# EOF File:ShStub.sh
 

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