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.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.49.3.
.TH CRCSUM "1" "February 2026" "Unknown option." "User Commands"
.SH NAME
crcsum \- check crc sum
.SH DESCRIPTION
.\" Add any additional description here
.PP
Unknown option.
.PP
CRCSUM: A file checksum utility. Version : 9.7
(C) Hans IJntema (2023)
.PP
CRCSUM stores a CRC checksum and file mtime as an extended attribute.
CRCSUM checks stored CRC checksum against actual CRC checksum
CRCSUM allows for CRC updates, only when mtime has changed
ZERO size files will not be checksum\-ed.
Directory & File SYMLINKS will not be followed.
NOTE: Some programs do change file content (even w/o saving),
while mtime is not update. Example, some Microsoft Excel versions
This will result in false positves when checking file against CRC.
.SS "Options :"
.TP
\fB\-a\fR
Calculate and Add checksum (no overwrite)
.TP
\fB\-u\fR
As \fB\-a\fR, and Update stale checksum
.TP
\fB\-f\fR
As \fB\-a\fR, Force overwrite existing checksum
.TP
\fB\-c\fR
Check file against stored checksum; stale CRC's are omitted
.TP
\fB\-e\fR
Assumes \fB\-c\fR; omit extension; one extension per option; eg \fB\-c\fR \fB\-e\fR xls \fB\-e\fR xlt
.TP
\fB\-p\fR
Print CRC64 checksum; stale CRC's are omitted; Add \fB\-d\fR to print stale and missing CRC's
.TP
\fB\-v\fR
Verbose. Print more information
.TP
\fB\-x\fR
Remove stored CRC64 checksum
.TP
\fB\-r\fR
Recurse through directories
.TP
\fB\-d\fR
Print Debug info. Implies \fB\-v\fR
.PP
Report errors and requests at bug\-coreutils@gnu.org
.PP
CRCSUM: A file checksum utility. Version : 9.7
(C) Hans IJntema (2023)
.PP
CRCSUM stores a CRC checksum and file mtime as an extended attribute.
CRCSUM checks stored CRC checksum against actual CRC checksum
CRCSUM allows for CRC updates, only when mtime has changed
ZERO size files will not be checksum\-ed.
Directory & File SYMLINKS will not be followed.
NOTE: Some programs do change file content (even w/o saving),
while mtime is not update. Example, some Microsoft Excel versions
This will result in false positves when checking file against CRC.
.SS "Options :"
.TP
\fB\-a\fR
Calculate and Add checksum (no overwrite)
.TP
\fB\-u\fR
As \fB\-a\fR, and Update stale checksum
.TP
\fB\-f\fR
As \fB\-a\fR, Force overwrite existing checksum
.TP
\fB\-c\fR
Check file against stored checksum; stale CRC's are omitted
.TP
\fB\-e\fR
Assumes \fB\-c\fR; omit extension; one extension per option; eg \fB\-c\fR \fB\-e\fR xls \fB\-e\fR xlt
.TP
\fB\-p\fR
Print CRC64 checksum; stale CRC's are omitted; Add \fB\-d\fR to print stale and missing CRC's
.TP
\fB\-v\fR
Verbose. Print more information
.TP
\fB\-x\fR
Remove stored CRC64 checksum
.TP
\fB\-r\fR
Recurse through directories
.TP
\fB\-d\fR
Print Debug info. Implies \fB\-v\fR
.PP
Report errors and requests at bug\-coreutils@gnu.org
.PP
CRCSUM: A file checksum utility. Version : 9.7
(C) Hans IJntema (2023)
.PP
CRCSUM stores a CRC checksum and file mtime as an extended attribute.
CRCSUM checks stored CRC checksum against actual CRC checksum
CRCSUM allows for CRC updates, only when mtime has changed
ZERO size files will not be checksum\-ed.
Directory & File SYMLINKS will not be followed.
NOTE: Some programs do change file content (even w/o saving),
while mtime is not update. Example, some Microsoft Excel versions
This will result in false positves when checking file against CRC.
.SS "Options :"
.TP
\fB\-a\fR
Calculate and Add checksum (no overwrite)
.TP
\fB\-u\fR
As \fB\-a\fR, and Update stale checksum
.TP
\fB\-f\fR
As \fB\-a\fR, Force overwrite existing checksum
.TP
\fB\-c\fR
Check file against stored checksum; stale CRC's are omitted
.TP
\fB\-e\fR
Assumes \fB\-c\fR; omit extension; one extension per option; eg \fB\-c\fR \fB\-e\fR xls \fB\-e\fR xlt
.TP
\fB\-p\fR
Print CRC64 checksum; stale CRC's are omitted; Add \fB\-d\fR to print stale and missing CRC's
.TP
\fB\-v\fR
Verbose. Print more information
.TP
\fB\-x\fR
Remove stored CRC64 checksum
.TP
\fB\-r\fR
Recurse through directories
.TP
\fB\-d\fR
Print Debug info. Implies \fB\-v\fR
.PP
Report errors and requests at bug\-coreutils@gnu.org
.PP
0 file(s) processed.
.SH "SEE ALSO"
The full documentation for
.B crcsum
is maintained as a Texinfo manual. If the
.B info
and
.B crcsum
programs are properly installed at your site, the command
.IP
.B info crcsum
.PP
should give you access to the complete manual.
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