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Full Discussion: file date vs. system date
Top Forums UNIX for Dummies Questions & Answers file date vs. system date Post 6747 by Perderabo on Tuesday 11th of September 2001 01:51:23 PM
Old 09-11-2001
Yes, even a one character write to a file without changing the file size will indeed update ctime. You can verify this with fewer keystrokes than you spent asking the question:

print -n a > x
ls -lc x
# wait a minute
print -n b > x
ls -lc x

Also the manpage for write(2) states:
Quote:
Upon successful completion, where nbyte is greator than 0, write() will mark for update the st_ctime and st_mtime fields of the file
 

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puts(3C)						   Standard C Library Functions 						  puts(3C)

NAME
puts, fputs - put a string on a stream SYNOPSIS
#include <stdio.h> int puts(const char *s); int fputs(const char *s, FILE *stream); DESCRIPTION
The puts() function writes the string pointed to by s, followed by a NEWLINE character, to the standard output stream stdout (see intro(3)). The terminating null byte is not written. The fputs() function writes the null-terminated string pointed to by s to the named output stream. The terminating null byte is not writ- ten. The st_ctime and st_mtime fields of the file will be marked for update between the successful execution of fputs() and the next successful completion of a call to fflush(3C) or fclose(3C) on the same stream or a call to exit(2) or abort(3C). RETURN VALUES
On successful completion, both functions return the number of bytes written; otherwise they return EOF and set errno to indicate the error. ERRORS
Refer to fputc(3C). USAGE
Unlike puts(), the fputs() function does not write a NEWLINE character at the end of the string. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
exit(2), write(2), intro(3), abort(3C), fclose(3C), ferror(3C), fflush(3C), fopen(3C), fputc(3C), printf(3C), stdio(3C), attributes(5), standards(5) SunOS 5.10 18 Jun 2003 puts(3C)
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