touch.1

来自「minix操作系统最新版本（3.1.1）的源代码」· 1 代码 · 共 50 行

.TH TOUCH 1
.SH NAME
touch \- change file access and modification times
.SH SYNOPSIS
\fBtouch\fR [\fB\-c\fR] [\fB\-a\fR] [\fB\-m\fR] [\fB\-r\fR file] [\fB\-t\fR [CC[YY]]MMDDhhmm[.ss]] [MMDDhhmm[YY]] \fIfile\fR ...\fR
.br
.de FL
.TP
\\fB\\$1\\fR
\\$2
..
.de EX
.TP 20
\\fB\\$1\\fR
# \\$2
..
.SH OPTIONS
.FL "\-c" "Do not create the file if it doesn't already exist"
.FL "\-a" "Change access time"
.FL "\-m" "Change modification time"
.FL "\-r file" "Apply time of specified file"
.FL "\-t [CC[YY]]MMDDhhmm[.ss]]" "Apply time specified"
.FL "\-t [MMDDhhmm[YY]]" "Apply time specified (alternate form)"
.SH EXAMPLES
.EX "touch *.h" "Make the \fI.h\fP files look recent"
.EX "touch -t 199610010000 *" "Change date and time of all files in current directory to midnight Oct 1, 1996"
.SH DESCRIPTION
.PP
With no options specified, the times of last modification and last access 
are set to the current time.
This command is mostly used to trick
.I make
into thinking that a file is more recent than it really is.
If the file being touched does not exist, it is created, unless the \fB\-c\fR
flag is present.
.PP
The \fB\-a\fR or \fB\-m\fR flag may be used to change only the access or 
modification time. The \fB\-r\fR or \fB\-t\fR flag may be used to change 
the times to match the times of another file or to a specified time.
.SH "SEE ALSO"
.BR utime (2).
.SH "AUTHOR"
.PP
Original author unknown.  Rewritten for POSIX by Peter Holzer
([e-mail]).
.\" man page updated by A. S. Woodhull 2005-01-15