library

#!/bin/bash
if [ $# = 0 ]
  then
    echo "library -- create a link that references "library" program or dir"
  else
    tooldir="../tools"
    if [ $# = 1 ]
      then
        filename=$1
      elif [ $# = 2 ]
      then
        tooldir=$1
        filename=$2
      else
        echo "too many args"
        exit
    fi
    if [ -e $filename ]
     then
       echo "cannot create library link over existing file"
       exit
     fi
    if [ -d $tooldir ]
     then
       if [ -e $tooldir/$filename ]
         then
           ln -s $tooldir/$filename $filename
           echo "library link created"
         else
           echo "$filename does not exist in $tooldir"
       fi
     else
       echo "$tooldir does not exist"
    fi
fi