Shell Programming and Scripting

Homework assignments are not permitted here, but maybe this will get you started:

Code:

unset files
n=0
for file in *
do
  [ -d "$file" ] &&
     files[${#files[@]}]=$file/ ||
     files[${#files[@]}]=$file
done
w=$(( $COLUMNS / 4 - 1 ))
printf "%-$w.${w}s %-$w.${w}s %-$w.${w}s %-$w.${w}s\n" "${files[@]}"

With very few exceptions, scripts written for sh will run without modification in bash.

Please put code inside [code] tags.

#!/bin/sh

if [ -n "$1" ]
then
 WORKDIR=$1
else
 WORKDIR=`pwd`
fi

WORKDIR=`echo $WORKDIR | awk \
'{
  if (substr($0,length($0),1)=="/")
  {
   print substr($0,1,length($0)-1)
  } else {
   print $0
  }
 }'`

echo $WORKDIR

for DIR in `ls -l $WORKDIR | grep "^d" | awk '{ print $NF }'`
do
 echo "Found directory $DIR, Decend, List, Ignore (D,L,I) ?"
 read DLI
 DLI=`echo $DLI | tr "dli" "DLI"`
 case $DLI in
  "D" ) $0 $WORKDIR/$DIR;;
  "L" ) ls -l $WORKDIR/$DIR | grep -v "^d" | awk -v COUNTER=0 \
'{
  printf "%s ",$NF
  COUNTER++
  if (COUNTER>=5)
  {
   printf "\n"
   COUNTER=0
  }
 }' | column -t;;
  "I" ) echo "Ignored directory $DIR";;
 esac
done

ls -l $WORKDIR | grep -v "^d" | awk -v COUNTER=0 \
'{
  printf "%s ",$NF
  COUNTER++
  if (COUNTER>=5)
  {
   printf "\n"
   COUNTER=0
  }
 }' | column -t

Code:

echo "The present working directory is: $WORKDIR "
cd $WORKDIR

for directory in *
do
    (I am thinking the test will go in here to test the value of $directory)
    echo "Found directory $directory; do you want to Descend, List or Ignore:"
    read answer
    case $answer in
    "D") WORKDIR=$WORKDIR/$directory
           echo $WORKDIR
           exec ./tryc $WORKDIR;;
     "L") (this will call a function to list the contents of the directory);;
     "I") echo "The directory was ignored" ;;
     esac
done

Use test -d.

Code:

if [ -d "$directory" }
then
   echo "$directory is a directory"
else
   echo "$directory is not a directory"
fi

Or you can bypass the test altogether; this will only list directories:

Code:

for directory in */

Code:

#!/bin/bash



displaydir()

{
	n=0

	local alist=$( ls $1 )

	for file in $alist

	do

	[ -d "$file" ] &&

		files[${#files[@]}]=$file/ ||

		files[${#files[@]}]=$file

	done

	w=10
 #$(($COLUMNS/4-1))

	printf "%-$w.${w}s %-$w.${w}s %-$w.${w}s %-$w.${w}s\n" "${files[@]}"
	
}


#unset files

#unset answer



descenddir()

{
	local BASEDIR=$1

	local LOCALDIR="$PWD"


	echo "The present working directory is: $BASEDIR "

	cd $BASEDIR

	echo "Do you want to display the contents of this directory?"

	read answer

	case $answer in

	"Y") displaydir "$BASEDIR";;

	"N") ;;

	esac



	local dirlist=$( ls )

	for directory in $dirlist

	do

		if [ -d $directory ]
 
		then {

			echo "Found directory $directory; do you want to Descend, List or Ignore (D,L, I): "

			read answer

			case $answer in

			"D") descenddir "$BASEDIR/$directory/";;

			"L") displaydir "$BASEDIR/$directory/";;

			"I") echo "The directory was ignored" ;;

			esac
 
		}

		fi

	done

	cd $LOCALDIR

}



if [ $1 ]
 
   then descenddir $1
 
   else descenddir "$PWD"

fi

Which line is giving you the problem?

Code:

if [ $# -gt 0 ]
then
  for dir
  do
    descenddir "$dir"
  done
else
  descenddir "$PWD"
fi

That will break if any filenames contain spaces. Use:

Code:

for file in "$1"/*

Or cd into the directory:

Code:

cd "$1"
for file in *

Quote:

Code:

   do
     [ -d "$file" ] &&
      files[${#files[@]}]=$file/ ||
      files[${#files[@]}]=$file
   done

   w=10  #$(($COLUMNS/4-1))

   printf "%-$w.${w}s %-$w.${w}s %-$w.${w}s %-$w.${w}s\n" "${files[@]}"
}

#unset files
#unset answer

descenddir()
{

It would make things simpler if you execute descenddir() in a subshell:

Code:

descenddir()
(

)

Then you don't need to worry about returning to a previous directory.

Quote:

Code:

   local BASEDIR=$1
   local LOCALDIR="$PWD"

   echo "The present working directory is: $BASEDIR "

   cd $BASEDIR

That will break if $BASEDIR contains spaces. Quote the variable and check that it succeeded:

Code:

cd "$BASEDIR" || return 1

Quote:

Code:

   echo "Do you want to display the contents of this directory?"
   read answer
   case $answer in
     "Y") displaydir "$BASEDIR";;
     "N") ;;
   esac

Code:

   case $answer in
     [yY]) displaydir "$BASEDIR";;
   esac

Quote:

Code:

   local dirlist=$( ls )

   for directory in $dirlist

That will break if any filenames contain spaces. Use:

Code:

for file in *

Quote:

Code:

   do
      if [ -d $directory ]
      then {

There's no need for the braces.

Quote:

Code:

    echo "Found directory $directory;
  do you want to Descend, List or Ignore (D,L, I): "
    read answer

    case $answer in
      "D") descenddir "$BASEDIR/$directory/";;
      "L") displaydir "$BASEDIR/$directory/";;
      "I") echo "The directory was ignored" ;;
    esac

Code:

   case $answer in
      [dD]) descenddir "$BASEDIR/$directory/";;
      [lL]) displaydir "$BASEDIR/$directory/";;
      [Ii]) echo "The directory was ignored" ;;
   esac

Quote:

Code:

 
      }
      fi

   done

   cd $LOCALDIR

That will break if $LOCALDIR contains spaces. Quote the variable and check that it succeeded:

Code:

cd "$LOCALDIR" || return 1

Quote:

Code:

}

if [ $1 ]
   then descenddir $1

That will break if $1 contains spaces. Quote the variable:

Code:

   then descenddir "$1"

Quote:

Code:

   else descenddir "$PWD"
fi