ex48.sh

Shall高级编程

#!/bin/bash

# Copying a directory tree using cpio.

# Advantages of using 'cpio':
#   Speed of copying. It's faster than 'tar' with pipes.
#   Well suited for copying special files (named pipes, etc.)
#+  that 'cp' may choke on.

ARGS=2
E_BADARGS=65

if [ $# -ne "$ARGS" ]
then
  echo "Usage: `basename $0` source destination"
  exit $E_BADARGS
fi  

source="$1"
destination="$2"

###################################################################
find "$source" -depth | cpio -admvp "$destination"
#               ^^^^^         ^^^^^
#  Read the 'find' and 'cpio' info pages to decipher these options.
#  The above works only relative to $PWD (current directory) . . .
#+ full pathnames are specified.
###################################################################


# Exercise:
# --------

#  Add code to check the exit status ($?) of the 'find | cpio' pipe
#+ and output appropriate error messages if anything went wrong.

exit $?