16 Jun The Student Is To Modify The Script Student Example P3 Following The Instructions In The Script
The student is to modify the script student example p3 following the instructions in the script.
The purpose of this script is to change the name of files/directories with spaces in the name to have a dash(-). So if a file/directory were named “A B”, the new name would be A-B. The script will work on a directory specified on the command line and replace the spaces in the names for all files/directories underneath that directory.
The options to the script are as follows:
-f the -f says to only rename files
-d the -d says to only rename directories
Both -d and and -f may be specifed.
the name of the directory that you will be processing.
For example:
Given the following
$ ls
C D/ dirs.tar fix-spaces*
And the directory “C D” contained the following structure
./C D
./C D/E F
./C D/E F/G H
./C D/E F/G H/J K
./C D/E F/G H/J K/a b
./C D/E F/G H/a b
./C D/E F/a b
./C D/a b
After the script was run,
fix-space -f -d “C D”
the directory structure would be as follows:
C-D
C-D/E-F
C-D/E-F/G-H
C-D/E-F/G-H/a-b
C-D/E-F/G-H/J—-K
C-D/E-F/G-H/J—-K/a-b
C-D/E-F/a-b
C-D/a-b
Here is a copy of the script – it is alos as an attachment in both UNIX and Windows format.
#!/usr/bin/ksh
USAGE=”$0 -f directory
$0 -d directory
$0 -d -f directory
-f rename files
-d rename directories
”
usage ()
{
print -u2 “$USAGE”
exit 1
}
pathname ()
{
# function provided for the student
print — “${1%/*}”
}
basename ()
{
# function provided for the student
print — “${1##*/}”
}
find_dirs ()
{
# function provided for the student
find “$1” -depth -type d -name ‘* *’ -print
}
find_files ()
{
# function provided for the student
find “$1” -depth -type f -name ‘* *’ -print
}
my_rename()
{
# the student must implement this function to my_rename
# $1 to $2
# The following error checking must happen:
# 1. check if the directory where $1 resided is writeable,
# if not then report an error
# 2. check if “$2” exists -if it does report and error and don’t
# do the mv command
# 3. check the status of the mv command and report any errors
: # remove this line after the function is coded
}
fix_dirs ()
{
# The student must implement this function
# to actually call the my_rename funtion to
# change the name of the directory from having spaces to
# changing all of the spaces to -‘s
# if the name were “a b”, the new name would be a-b
# if the name were “a b” the new name would be a—-b
: # remove this line after the function is coded
}
fix_files ()
{
# The student must implement this function
# to actually call the my_rename funtion to
# change the name of the file from having spaces to
# changing all of the spaces to -‘s
# if the name were “a b”, the new name would be a-b
# if the name were “a b” the new name would be a—-b
: # remove this line after the function is coded
}
WFILE=
WDIR=
DIR=
if [ “$#” -eq 0 ]
then
usage
fi
while [ $# -gt 0 ]
do
case $1 in
-d)
WDIR=1
;;
-f)
WFILE=1
;;
-*)
usage
;;
*)
if [ -d “$1″ ]
then
DIR=”$1”
else
print -u2 “$1 does not exist …”
exit 1
fi
;;
esac
shift
done
# The student must implement the following:
# – if the directory was not specified, the script should
# print a message and exit
# – if the Directory specified is the current directory, the script
# print a error message and exit
# – if the directory specified is . or .. the script should print
# an error message and exit
# – if both -f and -d are not specified, the script should print a
# message and exit
#
if [ “$WDIR” -a “$WFILE” ]
then
fix_files “$DIR”
fix_dirs “$DIR”
elif [ “$WDIR” ]
then
fix_dirs “$DIR”
elif [ “$WFILE” ]
then
fix_files “$DIR”
fi
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