Rod, here is a crude script that I wrote in bash. It uses cksum to check if the file in DIR_1 is modified. I have commented most of the steps. This one is just to give you an idea of using a different approach other than diff, I hope it helps.
Code:
#!/bin/bash
for file_1 in $( find DIR_1/* -type f | sed 's/\.\.\///g' ) # For each file in DIR_1
do
file_2=$( echo $file_1 | sed 's/DIR_1/DIR_2/g' ) # Getting file path in DIR_2
dir_2=$( dirname $file_2 )
if [ ! -d $dir_2 ] # Checking if sub-dir exists in DIR_2
then
echo -e "Dir: $dir_2 does not exist. Creating...\c"
mkdir -p $dir_2 # Creating if sub-dir missing
echo "Done"
fi
if [ -f $file_2 ] # Checking if file exists in DIR_2
then
cksum_file_1=$( cksum $file_1 | cut -f 1 -d " " ) # Get cksum of file in DIR_1
cksum_file_2=$( cksum $file_2 | cut -f 1 -d " " ) # Get cksum of file in DIR_2
if [ $cksum_file_1 -ne $cksum_file_2 ] # Check if cksum matches
then
echo -e "File: $file_1 is modified. Copying..\c"
cp $file_1 $file_2 # Copy if cksum mismatch
echo "Done"
fi
else
echo -e "File: $file_2 does not exist. Copying...\c"
cp $file_1 $file_2 # Copy if file does not exist.
echo "Done"
fi
done
BTW I am using only 2 directory structures in this script: DIR_1 & DIR_2.
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Discussion started by: nimafire
2 Replies
LEARN ABOUT OPENSOLARIS
cksum
cksum(1) User Commands cksum(1)NAME
cksum - write file checksums and sizes
SYNOPSIS
cksum [file]...
DESCRIPTION
The cksum command calculates and writes to standard output a cyclic redundancy check (CRC) for each input file, and also writes to standard
output the number of octets in each file.
For each file processed successfully, cksum will write in the following format:
"%u %d %s
" <checksum>, <# of octets>, <path name>
If no file operand was specified, the path name and its leading space will be omitted.
The CRC used is based on the polynomial used for CRC error checking in the referenced Ethernet standard.
The encoding for the CRC checksum is defined by the generating polynomial:
G(x) = x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x + 1
Mathematically, the CRC value corresponding to a given file is defined by the following procedure:
1. The n bits to be evaluated are considered to be the coefficients of a mod 2 polynomial M(x) of degree n-1. These n bits are the
bits from the file, with the most significant bit being the most significant bit of the first octet of the file and the last bit
being the least significant bit of the last octet, padded with zero bits (if necessary) to achieve an integral number of octets,
followed by one or more octets representing the length of the file as a binary value, least significant octet first. The small-
est number of octets capable of representing this integer is used.
2. M(x) is multiplied by x ^32 (that is, shifted left 32 bits) and divided by G(x) using mod 2 division, producing a remainder R(x)
of degree <= 31.
3. The coefficients of R(x) are considered to be a 32-bit sequence.
4. The bit sequence is complemented and the result is the CRC.
OPERANDS
The following operand is supported:
file A path name of a file to be checked. If no file operands are specified, the standard input is used.
USAGE
The cksum command is typically used to quickly compare a suspect file against a trusted version of the same, such as to ensure that files
transmitted over noisy media arrive intact. However, this comparison cannot be considered cryptographically secure. The chances of a dam-
aged file producing the same CRC as the original are astronomically small; deliberate deception is difficult, but probably not impossible.
Although input files to cksum can be any type, the results need not be what would be expected on character special device files. Since this
document does not specify the block size used when doing input, checksums of character special files need not process all of the data in
those files.
The algorithm is expressed in terms of a bitstream divided into octets. If a file is transmitted between two systems and undergoes any data
transformation (such as moving 8-bit characters into 9-bit bytes or changing "Little Endian" byte ordering to "Big Endian"), identical CRC
values cannot be expected. Implementations performing such transformations may extend cksum to handle such situations.
See largefile(5) for the description of the behavior of cksum when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of cksum: LANG, LC_ALL, LC_CTYPE, LC_MES-
SAGES, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 All files were processed successfully.
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO digest(1), sum(1), bart(1M), attributes(5), environ(5), largefile(5), standards(5)SunOS 5.11 1 Feb 1995 cksum(1)