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2012-12-16

bash stub

#!/bin/bash
# File: sh-stub.sh v.1.5.0 docs at the end 
umask 000 ; 
 
# print the commands 
# set -x
# print each input line as well
# set -v
# exit the script if any statement returns a non-true return value. gotcha !!!
# set -e 
 
 
#
# parse the single letter command line args 
doParseCmdArgs(){
 
while getopts ":a:h" opt; do
  case $opt in
    a)
      doLog "-a cmd arg was triggered, Parameter: $OPTARG" >&2
      export vars="$vars $OPTARG"
      doLog "\$vars is $vars"
      ;;
    h)
      doLog "-h cmd arg was triggered, Parameter: $OPTARG" >&2
      doPrintHelp 0
      ;;
    \?)
      doLog "Invalid option: -$OPTARG" >&2
      doPrintHelp 2
      exit 1
      ;;
    :)
      doLog "Option -$OPTARG requires an argument." >&2
      doPrintHelp
      exit 1
      ;;
  esac
done
}
# eof func doParseCmdArgs
 
 
#
# set the variables from the $0.`hostname`.conf file which has ini like syntax
doSetVars(){
   MyDir=`dirname $(readlink -f $0)`
   Tmp="$MyDir/tmp/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/$MyName.log"
   # get the machine / host specific configuration 
   for i in {1..5} ; do cd .. ;done ;
   ProductBaseDir=`pwd`;
   export ProductBaseDir;
   cd "$MyDir/"
   doParseIniFile
   #source $0
   ( set -o posix ; set ) >$Tmp/variables.after
   doLog " Using the following vars :"
   cmd="comm --nocheck-order -3 $Tmp/variables.before $Tmp/variables.after"
   doRunCmdAndLog $cmd
   rm -fr "$Tmp/"
}
# eof function doSetVars
 
 
#
# parse the ini like $0.hostname.conf and set the variables
doParseIniFile(){
   eval `sed -e 's/[[:space:]]*\=[[:space:]]*/=/g' \
      -e 's/;.*$//' \
      -e 's/[[:space:]]*$//' \
      -e 's/^[[:space:]]*//' \
      -e "s/^\(.*\)=\([^\"']*\)$/\1=\"\2\"/" \
      < $IniFile \
      | sed -n -e "/^\[$IniSection\]/,/^\s*\[/{/^[^;].*\=.*/p;}"`
}
# eof function doParseIniFile
 
 
#
# run a command and log the call and its output to the LogFile
# usage: doRunCmdAndLog $cmd
doRunCmdAndLog(){
   cmd="$*" ; 
   doLog " DEBUG running cmd : \"$cmd\""
   Msg=$($cmd 2>&1)
   [ $? -eq 0 ]  || doLog "ERROR : Failed to run the following command \"$cmd\" with the following output \"$Msg\" !!!"
   doLog " DEBUG : cmdoutput : \"$Msg\""
}
# eof function doRunCmdAndLog
 
 
#
# run a command on failure exit with message
# usage: doRuncmdOrExit $cmd
doRuncmdOrExit(){
   cmd="$*" ; 
   doLog " DEBUG running cmd : \"$cmd\""
   Msg=$($cmd 2>&1)
   # if error occured during the execution exit with error
   [ $? -eq 0 ] || doExit "ERROR : FATAL : Failed to run the following command \"$cmd\" with the following output \"$Msg\" !!!"
   #if no error occured just log the message
   doLog " DEBUG : cmdoutput : \"$Msg\""
}
# eof function doRuncmdOrExit
 
 
#
# runs procs in parallel on a file set from the the find command 
doRunProcsInParallel(){
 
   cmd="zgrep $strToGrep '{}' >> $FileFilteredResults"
   #todo remove echo 
   doLog "RUNNING cmd find ${DirFindRoot} -type f  -name ${nameFilter} -print0 | xargs -0 -I '{}' sh -c $cmd!!!"
   #Action !!!
   #debug sleep 1
   find ${DirFindRoot} -type f  -name ${nameFilter} -print0 | xargs -0 -I '{}' sh -c "$cmd"
 
}
# eof doRunProcsInParallel
 
 
#
# echo pass params and print them to a log file
doLog(){
      # 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 doLog 
 
#
# perform the checks to ensure that all the vars needed to run are set 
doCheckReadyToStart(){
 
   test -f $IniFile || doExit 1 "Cannot find IniFile : $IniFile" 
 
}
# eof function 
 
 
# exit with passed status and message
doExit(){
  ExitCode=0 
  case $1 in [0-9]) 
  ExitCode="$1";
    shift 1;
    esac 
    Msg="$*"
    if [ "$ExitCode" != 0 ] ; then
      Msg=" ERROR --- ExitCode $ExitCode --- Msg : $Msg" 
    fi
    doLog " $Msg" 
    echo -e "\n\n"
    exit $ExitCode
}
# eof function doExit
 
 
#
# the main function called 
main(){
   doSetVars
   doParseCmdArgs $@
   doCheckReadyToStart
  }
# eof function main
 
doPrintHelp(){
 
   ExitCode="$1";
   
   echo ""
   echo ""
   echo `basename $0` "is an utlity script having the following purpose"
   echo " to provide an easy starting template for writing bash and sh scripts"
   echo " with  the following features: "
   echo " - prints the set in the script variables"
   echo " - separation of host specific vars into $0.`hostname`.conf file"
   echo " - doLog function for both xterm and log file printing"
   echo " - for loop examples with head removal and inline find and replace "
   echo " - getopts example for accepting cmd args "
   echo ""
   echo ""
   
   doExit $ExitCode "printing help and exit" 
}
# eof func doPrintHelp
 
 
# Action !!! call the main by passing the cmd args 
main $@
 
 
 
# Purpose:
# to provide an easy starting template for writing bash and sh scripts
# with  the following features: 
# - prints the set in the script variables
# - separation of host specific vars into $0.`hostname`.conf file
# - doLog function for both xterm and log file printing
# - for loop examples with head removal and inline find and replace 
# 
# ErrorCodes 
# 1 --- Cannot find conf file 
# 2 --- called with a wrong cmd argument or -h for help 
# 
# VersionHistory: 
# 1.5.1 --- 2012-12-15 23:38:46 --- ysg --- fixed bug with test
# 1.5.0 --- 2012-12-15 23:04:09 --- ysg --- Added getopts function for cmd parsing
# 1.4.2 --- 2012-11-09 13:10:03 --- ysg --- ErrorCode added , refactoring
# 1.4.1 --- 2012-11-09 13:10:03 --- ysg --- Refactoring 
# 1.4.0 --- 2012-10-24 08:57:01 --- ysg --- Added the doRunProcsInParallel function 
# 1.3.1 --- 2012-10-11 12:29:47 --- ysg --- doMethod naming , doExit change with ERROR
# 1.3.0 --- 2012-05-20 18:48:08 --- ysg --- replacing cmd with error output
# 1.2.6 --- 2012-05-02 20:41:11 --- ysg --- added for loop with pipes 
# 1.1.0 --- ysg --- add runcmd with erro
# 1.0.0 --- ysg --- Initial creation
# EOF File:sh_stub_cygwin.sh
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