Shell Programming and Scripting

#!/bin/ksh

ERROR1="error:can only use 0 or 1 arguments.\nusage:maxlines.sh[directory]"
ERROR2="error:argument must be a Directory.\nusage:maxlines.sh[directory]\n"
if [[ $# -gt 1 ]]
  then
        printf "$ERROR1"
        exit 1
fi
DIR="."
if [[ $# -eq 1]]
   then
        if[[ -d $1 ]]
        then
        DIR="$1"
   else
        printf "$ERROR2"
        exit 1
fi
cd $DIR
FILE=$(wc-l `ls` 2>/dev/null | sort -bn | Tail -n 2 | head -n 1)
printf "File `echo $FILE | awk '{print $2}'` has the maximum lines with `echo $1| awk '{print $1}'` lines.\n"
exit 0

if [[ $# -eq 1 ]]   <<----  space after "1"
   then
        if [[ -d $1 ]]  <<---- space after "if"

if [[ $# -eq 1]]
   then
        if[[ -d $1 ]]
        then
        DIR="$1"
   else
        printf "$ERROR2"
        exit 1
fi

$ if [[ $# -eq 1 ]]
then
   if [[ -d $1 ]]
   then
      DIR="$1"
   else
      printf "$ERROR2"
#     exit 1
   fi
fi
[1]+ [[ 0 -eq 1 ]]
$