Shell Programming and Scripting

 
#!/bin/ksh
 
export dir="$1"
 
if [ ! -d "$dir" ]
then
 echo "Not a directory: '$dir'
 
Usage: ${0##*/} <directory_path>
" > &2
fi
 
 .
 .
 .
 .

#!/bin/ksh
if [ $# -lt 1 ]
then
    echo "Usage: myscript dir [dir ...]" >&2
    exit 1
fi
 
while [ $# -gt 0 ]
do
    dir=$1
    if [ ! -d "$dir" ]
    then
        echo "Not a directory: $dir"
        exit 2
    fi
    .
    .
    .
    shift
done

#!/bin/ksh
if [ $# -lt 1 ]
then
    echo "Usage: myscript dir [dir ...]" >&2
    exit 2
fi
 
i=0
while [ $# -gt 0 ]
do
    if [ ! -d "$1" ]
    then
        echo "Not a directory: $1"
        exit 2
    fi
    dirs[i++]="$1"
    shift
done
 
i=0
while [ $i -lt ${#dirs[@]} ]
do
   echo Process directory ${dirs[i]} here...
   let i+=1
done