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Full Discussion: Usage of Touch Command
Top Forums Shell Programming and Scripting Usage of Touch Command Post 80397 by aigles on Monday 8th of August 2005 02:44:27 AM
Old 08-08-2005
From the touch man page :

Quote:
Description

The touch command updates the access and modification times of each file
specified by the File parameter of each directory specified by the Directory
parameter. If you do not specify a value for the Time variable, the touch
command uses the current time. If you specify a file that does not exist, the
touch command creates the file unless you specify the -c flag.

The return code from the touch command is the number of files for which the
times could not be successfully modified (including files that did not exist and
were not created). Note Any dates beyond and including the year 2038 are
invalid.

. . . . . . . . .

Examples

1. To update the access and modification times of a file, enter:

touch program.c

This sets the last access and modification times of the program.c file to
the current date and time. If the program.c file does not exist, the touch
command creates an empty file with that name.
2. To avoid creating a new file, enter:

touch -c program.c

3. To update only the modification time, enter:

touch -m *.o

This updates the last modification times (not the access times) of the
files that end with a .o extension in the current directory. The touch
command is often used in this way to alter the results of the make command.
4. To explicitly set the access and modification times, enter:

touch -c -t 02171425 program.c

This sets the access and modification dates to 14:25 (2:25 p.m.) February
17 of the current year.
5. To use the time stamp of another file instead of the current time, enter:

touch -r file1 program.c

This gives the program.c file the same time stamp as the file1 file.
6. To touch a file using a specified time other than the current time, enter:

touch -t 198503030303.55 program.c

This gives the program.c file a time stamp of 3:03:55 a.m. on March 3,
1985.

Jean-Pierre.
 

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LEARN ABOUT SUSE

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
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