CRC <options><filespec>
Valid options:
'-c' - ignore any CR characters in files
'-d' - recurse directories specified by filespec (when wildcards are used)
Ex: CRC -d D:\PC* will CRC all files in directory names matching PC* on drive D:\
'-l' - print the output in lowercase
'-r' - don't recurse through sub directories
'-s' - sort the output (defaults to lowercase output)
Note: The '-r' option will override '-d'The default behavior of the CRC program is to begin processing at the directory where the program was executed unless specified in the filespec on the command line.
CRC FILE1.TXT
This will perform a CRC check on the file FILE1.TXT that is located in the current directory.
CRC FILE1.TXT FILE2.TXT
This will perform a CRC check on the files FILE1.TXT and FILE2.TXT, which are located in the current directory.
CRC C:\*
This will perform a CRC check on every file located in the C: drive, starting at the root directory.
This format allows you to enter multiple filespecs.
Option '-l' for displaying output in all lowercase characters
If you want the output to be displayed in all lowercase characters, then use the '-l' option. This is a sample without the option:
CRC C:\*.TXT
CRC 32 File Size Filename
-------------------------------------------------
d187177e 6064 c:\FRUNLOG.TXT
c68b248d 6790 c:\FACLOG.TXT
92598e18 545 c:\pbi.txt
This is a sample with the '-l' option:
CRC -l C:\*.TXT
CRC 32 File Size Filename
-------------------------------------------------
d187177e 6064 c:\frunlog.txt
c68b248d 6790 c:\faclog.txt
92598e18 545 c:\pbi.txt
Option '-c' for ignoring MSDOS carriage return characters (CR) in files
This option is especially useful for comparing files that originated from a Unix platform that were copied onto a MSDOS filesystem. The "return" used by MSDOS is CRLF, while Unix only uses LF. When this option is used, the extra "CR" character (ASCII code 13) is ignored.
This option is strongly recommended if you don't know where the files you are comparing originated from. If you copy a file from a CD that was created on Unix to an MSDOS system, the files will be identical, but the LF characters will be converted to CRLF.
This is a sample, comparing two files. One is the file that was installed to the local MSDOS system, which the other file originated from a Unix platform. Although the files are actually identical, the extra "CR" characters cause this to fail the checksum because the file sizes will be different:
CRC DOS.M UNIX.M
CRC 32 File Size Filename
-------------------------------------------------
0e579d83 365 D:\Dev\crc32\dos.m
c267c328 356 D:\Dev\crc32\unix.m
Using the '-c' option fixes this problem. The file sizes will still be reported as different, but the files will have the same CRC because the extra characters were ignored:
CRC -c DOS.M UNIX.M
CRC 32 File Size Filename
-------------------------------------------------
c267c328 365 D:\Dev\crc32\dos.m
c267c328 356 D:\Dev\crc32\unix.m
Option '-s' for sorting the output
If you want the output to be sorted, which is very useful for complex hierarchies or when you have a lot of files to examine. All of the output will be in lowercase. This is a sample without the option:
CRC C:\*.TXT
CRC 32 File Size Filename
-------------------------------------------------
d187177e 6064 c:\FRUNLOG.TXT
c68b248d 6790 c:\FACLOG.TXT
92598e18 545 c:\pbi.txt
This is a sample with the '-s' option:
CRC -s C:\*.TXT
CRC 32 File Size Filename
-------------------------------------------------
c68b248d 6790 c:\faclog.txt
d187177e 6064 c:\frunlog.txt
92598e18 545 c:\pbi.txt
Option '-r' to prevent the program from performing directory recursion when looking for files
This is a useful option when you are comparing files at the root of a complex hierarchy, but don't want the program to search for each file in every subdirectory. Here's an example, where we want to perform a CRC check on every file located in the D : root directory:
CRC D:\
CRC 32 File Size Filename
-------------------------------------------------
aac454d0 147456 d:\ffastun.ffl
157fd737 696320 d:\ffastun0.ffx
68c9d3a1 528384 d:\ffastun.ffo
d2e92df0 4379 d:\ffastun.ffa
d5935680 105 d:\INSTALL.LOG
a83a68e9 1370 d:\chi_yahoo.txt
381b09e4 1821129 d:\DOOM2\2SPOOK35.WAD
2f71ff8a 97 d:\DOOM2\772.BAT
4ec75c1b 97 d:\DOOM2\773.BAT
6a9e3022 99 d:\DOOM2\7734M.BAT
. . . more files....
This isn't what you wanted. If the '-r' option is used, then only the files at the root directory of D:\ will be searched. Any subdirectories under D:\ will be ignored. Here's an example:
CRC -r D
:
CRC 32 File Size Filename
-------------------------------------------------
aac454d0 147456 d:\ffastun.ffl
157fd737 696320 d:\ffastun0.ffx
68c9d3a1 528384 d:\ffastun.ffo
d2e92df0 4379 d:\ffastun.ffa
d5935680 105 d:\INSTALL.LOG
a83a68e9 1370 d:\chi_yahoo.txt
Option '-d' to recurse all subdirectories that match the wildcard filespec
This option is required if you want to perform a CRC checksum on files that match a wildcard filespec. If this option isn't used, then the program will only search for files that match the wildcard filespec, which is the default behavior.
Here's an example, where we want to perform a CRC checksum on all files in subdirectories matching the Z* wildcard filespec:
CRC -d D:\Z*CRC 32 File Size Filename-------------------------------------------------9236af56 746882 d:\zip\nottab.zip6d4178e3 130027 d:\zip\prntky.zip78326393 666293 d:\zip\wsftp.zipa27c03ac 1345683 d:\zip\wintun.zip2f7bf5c7 5743171 d:\zip\pbi32_3.exeb6fc3ff4 2520456 d:\zip\PWX95.EXE169d3324 2626635 d:\zip\qteasy32.exe58e8d67b 135706 d:\zip\wzspnb32.exe8e8b9cae 7582 d:\zddesktop\ZDDESK.TXT436af461 56558 d:\zddesktop\DESK_SRC.ZIP95d6dd42 22327 d:\zddesktop\ZDDESK.HLP
Without the '-d' option, this would be the output. Notice that only files and subdirectories matching the wildcard filespec will be displayed:
CRC D:\Z*
CRC 32 File Size Filename
-------------------------------------------------
d5763d90 156228 d:\zip\ZDDESK.ZIP
8e8b9cae 7582 d:\zddesktop\ZDDESK.TXT
95d6dd42 22327 d:\zddesktop\ZDDESK.HLP
38700249 406 d:\zddesktop\ZDDESK.CNT
b5c76eec 223744 d:\zddesktop\ZDDESK.EXE
eaa8e392 10825 d:\zddesktop\ZDDESK.GID
Multiple arguments
You can use multiple arguments on the command line. This example will recurse through two directories:CRC32DOS C:\TEMP D:\TEMPThe results from D:\TEMP will be appended to the output from C:\TEMP.
Using different options for multiple arguments
This is a very useful feature when you may want to perform recursion on one subdirectory tree while only performing a checksum on files in a directory. The following example will perform a full subdirectory recursion (with lowercase output) on the C:\WINDOWS directory, and only checksum the files in the D:\TEMP directory:CRC32DOS -l C:\WINDOWS -r D:\TEMP
Any options flags encountered before a filespec will override the previous options specified. In this case, the output for the D:\TEMP directory won't be in lowercase because the 'l' option wasn't specified.
You can also simply erase all option flags by simply using a dash, like in this example:CRC32DOS -l C:\WINDOWS - D:\TEMP
A full subdirectory recursion will be performed on the D:\TEMP directory, and the output won't be in lowercase.