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Full Discussion: ksh date math
Top Forums Shell Programming and Scripting ksh date math Post 302482017 by jim mcnamara on Monday 20th of December 2010 11:29:37 AM
Old 12-20-2010
Code:
result=$(
/usr/bin/perl -w -e '
use strict;
use POSIX;
print strftime "%Y-%m-%d %H:%M:%S\n", localtime((time() - 7200)); ' 
)

echo "$result"

perl -e '[command goes here]' is for an inline command.

Except the strftime command produces a time string will not work with touch. touch puts an mtime timestamp on a file.
Should be (not checked):
Code:
"%Y%m%d%H%M%S"

which is YYYYmmddhhmiss

Check your manpage; some older versions of touch require touch -t YYYYmmddhhmi.ss [filename] <- note the extra dot

Last edited by jim mcnamara; 12-20-2010 at 12:35 PM..
This User Gave Thanks to jim mcnamara For This Post:
 

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TOUCH(1)							   User Commands							  TOUCH(1)

NAME
touch - change file timestamps SYNOPSIS
touch [OPTION]... FILE... DESCRIPTION
Update the access and modification times of each FILE to the current time. Mandatory arguments to long options are mandatory for short options too. -a change only the access time -B, --backward=SECONDS Modify the time by going back SECONDS seconds. For example, touch -r foo -B 5 bar will make the file bar 5 seconds older than file foo. -c, --no-create do not create any files -d, --date=STRING parse STRING and use it instead of current time -F, --forward=SECONDS Modify the time by going forward SECONDS seconds. For example, touch -r foo -F 5 bar will make the file bar 5 seconds newer than file foo. -f (ignored) -m change only the modification time -r, --reference=FILE use this file's times instead of current time -t STAMP use [[CC]YY]MMDDhhmm[.ss] instead of current time --time=WORD set time given by WORD: access atime use (same as -a) modify mtime (same as -m) --help display this help and exit --version output version information and exit Note that the -d and -t options accept different time-date formats. AUTHOR
Written by Paul Rubin, Arnold Robbins, Jim Kingdon, David MacKenzie, and Randy Smith. REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>. COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
The full documentation for touch is maintained as a Texinfo manual. If the info and touch programs are properly installed at your site, the command info touch should give you access to the complete manual. touch (coreutils) 4.5.3 October 2002 TOUCH(1)
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