Linux Shell: copy a folder script

Write a script to copy the folder.

Principle: first package the folder to be copied with tar, then copy the package, and then unpack the package.
Receive two parameters. If the parameter is smaller than 2, an error is returned.
If the target folder is not a folder, an error is returned.
If the source file (folder) does not exist, an error is returned.
Then extract the file to be copied, such as/home/user1/test,
Then, package the file (folder) in tar.
Upload the package to the target folder, decompress the package, and delete the intermediate file (generated by TAR.

 

Code :#! /Bin/sh
# Cpdir source_dir target_dir
# Author hjack
# Date: 2006.3.25
# Copy dir

######### Variables define ##########
Source_dir = $1
Target_dir = $2
Current_dir = 'pwd'
Source_file = ""

######### Main start here ###########
# Check the argements.
If [$ #-lt 2]; then
Echo "request more arguments ."
Exit
Fi

# Does the target dir exist?
If [! -D $ target_dir]; then
Echo "not such dir ."
Exit
Fi

If [-e $ source_dir]; then
# Sourcedir string ends '/'.
Echo $ source_dir | grep/$>/dev/null
If [$? -EQ 0]; then
# Get the file or dir name. eg:/home/user1/test, it will get test.
Source_file = $ (echo $ source_dir | awk-F/'{print $(NF-1 )}')
Else
Source_file = $ (echo $ source_dir | awk-F/'{print $ NF }')
Fi
Else
Echo "not such dir ."
Exit
Fi

# First, compress the Dir.
Tempfile = "tmp. cpdir0000123456789". $ source_file ". tgz"
Tar zcf $ tempfile $ source_file

# Then, decompress the tar file.
MV $ tempfile $ target_dir
CD $ target_dir
Tar zxf $ tempfile
Rm $ tempfile
CD $ current_dir
Echo "Copy finished ."

Note:
$ # Indicates the number of command parameters.
[-D $ target_dir] test whether the target folder is a folder.
[$? -EQ 0] test whether the previous command is successfully executed.
$? Is the return code of the previous command.
Tar packaging command.