mvdir.sh

Berkely的学生写的

#!/bin/sh
# Name: mvdir
# Desc: Move directories across file systems
# Args: $1 -> src dir
#       $2 -> dest dir

PATH=/bin:/usr/bin ; export PATH

# function to print errors and exit

printERROR() { echo "ERROR: $@." >&2 ; exit 1; }

# function to print usage message and exit

printUSAGE() { echo "USAGE: `/bin/basename $0` $@." >&2 ; exit 1; }

# check if sufficient args are given

if [ $# -lt 2 ] ; then printUSAGE "[src] [dest]" ; fi

# check if the source directory exists

if [ ! -d "$1" ] ; then
    printERROR "The source $1 is not a directory, or does not exist"
fi

# split up the source dir into its name and its parents name for
# easier processing later on

SRCDIR_PARENT="`/usr/bin/dirname $1`"
SRCDIR_CHILD="`/bin/basename $1`"

# if dirname returns a relative dir we will be confused after cd'ing
# latter on. So reset it to the full path.

SRCDIR_PARENT="`(cd $SRCDIR_PARENT ; pwd ; )`"

# initalize the destination directory

DESTDIR="$2"; 

# check if the destination exits

if [ ! -d "$DESTDIR" ] ; then

    # if the destination doesn't exist then assume the destination is
    # the new name for the directory

    DESTDIR="`/usr/bin/dirname $2`"
    NEWNAME="`/bin/basename $2`"

fi

# if dirname returns a relative dir we will be confused after cd'ing
# latter on. So reset it to the full path.

DESTDIR=`(cd $DESTDIR ; pwd ; )`

# if the parent of the destination doesn't exist,
# were in trouble. Tell the user and exit.

if [ ! -d "$DESTDIR" ] ; then
    printERROR "A parent of the destination directory $2 does not exist"
fi

# try and cd to the parent src directory

cd "$SRCDIR_PARENT" > /dev/null 2>&1
if [ $? -ne 0 ] ; then
    printERROR "Could not cd to $SRCDIR_PARENT"
fi

# use tar to copy the source dir to the destination

/bin/tar -cvpf - "$SRCDIR_CHILD" | ( cd "$DESTDIR" ; /bin/tar -xvpf - )

if [ $? -ne 0 ] ; then
    printERROR "Unable to sucessfully move $1 to $2"
fi

# if a rename of the copy is requested

if [ -n "$NEWNAME" ] ; then

    # try and change to the destination directory 

    cd "$DESTDIR" > /dev/null 2>&1
    if [ $? -ne 0 ] ; then
	printERROR "Could not cd to $DESTDIR"
    fi

    # try and rename the copy

    /bin/mv "$SRCDIR_CHILD" "$NEWNAME" > /dev/null 2>&1
    if [ $? -ne 0 ] ; then
	printERROR "Could not rename $1 to $2"
    fi

    # return to the original directory

    cd "$SRCDIR_PARENT" > /dev/null 2>&1
    if [ $? -ne 0 ] ; then
	printERROR "Could not cd to $SRCDIR_PARENT"
    fi
fi

# try and remove the original

if [ -d "$SRCDIR_CHILD" ] ; then 
    /bin/rm -r "$SRCDIR_CHILD" > /dev/null 2>&1
    if [ $? -ne 0 ] ; then
	printERROR "Could not remove $1"
    fi
fi

exit 0