which_k93

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#!/usr/bin/ksh93
################################################################
function usagemsg_which_k93 {
  print "
Program: which_k93

The which_k93 Korn Shell command/function takes a list
of program names and looks for the files that run when
these names are given as commands.

Usage: ${1##*/} [-?] [-q|-v] [-V] CommandName

    Where:
          '-q' = Quiet mode, path name of command not output
          '-v' = Verbose mode
          '-V' = Very Verbose Mode

Author: Dana French (dfrench@mtxia.com)    Copyright 2004

\"AutoContent\" enabled"
return 0
}
################################################################
function which_k93 {
  typeset TRUE="0"
  typeset FALSE="1"
  typeset QUIET="${FALSE}"
  typeset VERBOSE="${FALSE}"
  typeset VERYVERB="${FALSE}"
  typeset EXITCODE="102"
  
  while getopts ":qvV" OPTION
  do
      case "${OPTION}" in
          'q') QUIET="${TRUE}";;
          'v') VERBOSE="${TRUE}";;
          'V') VERYVERB="${TRUE}";;
          '?') usagemsg_which_k93 "${0}" && return 101;;
      esac
  done
   
  shift $(( ${OPTIND} - 1 ))

#### 
#### Check the first command line parameter after processing
#### all the options to see if it is null, if so display the
#### usagemsg and return with an unsuccessful return code. 
#### 

  if [[ "_${1}" = "_" ]]
  then
      usagemsg_which_k93 "${0}"
      return 103
  fi

  (( VERYVERB == TRUE )) && set -x
  
################################################################
  
#### 
#### Separate the directories in the PATH variable into an
#### array.  If the PATH variable is empty, return with an
#### unsuccessful return code. 
#### 

  [[ "_${PATH}" = "_" ]] && return 104
  IFS=":" DIRS=( ${PATH} )

#### Set a pair of variables to keep track of how many
#### command names were not found.  Initialize both counters
#### to the number of command name specified on the command
#### line.

  EXITCODE="${#}"
  CMDS="${#}"

#### 
#### Loop through each directory of the PATH variable and
#### check for the existance of the specified command name. 
#### If it exists, print the fully qualified file name and
#### exit with a successful return code.  If it does not
#### exist, don't print anything and return with an
#### unsuccessful return code. 
#### 

  for CMDNAME in "${@}"
  do
    (( CMDS-- ))
    for DIR in "${DIRS[@]}"
    do
      (( VERBOSE == TRUE )) && print "# Searching ${DIR} for ${CMDNAME}"
      if [[ -f "${DIR%/}/${CMDNAME}" ]]
      then
         (( VERBOSE == TRUE )) && print "# Found command \"${CMDNAME}\" in directory \"${DIR}\""
         (( QUIET == FALSE )) && print -r -- "${DIR%/}/${CMDNAME}"
          (( EXITCODE-- ))
          break
      fi
    done

#### If the number of commands processed does not match the
#### number of commands found, issue an error message for the
#### current command being processed and add 1 back to the
#### number of commands processed.

    if (( EXITCODE != CMDS ))
    then
        print -u 2 "${0}: There is no ${CMDNAME} in ${DIRS[@]}"
        (( CMDS++ ))
    fi

  done

  return ${EXITCODE}

}
################################################################

which_k93 "${@}"