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Top Forums Shell Programming and Scripting modifying date (-10 hours) in the content of a file Post 302250730 by aismann on Friday 24th of October 2008 06:48:07 AM
Old 10-24-2008
modifying date (-10 hours) in the content of a file

Dear Experts,

I have a problem. I have a file which has contents such as below, with about 500K lines

Code:
34|1|532|2008.10.24 23:41:13|2-1-1-13|90130060128441171|CO0402|0|0x00000201A402000021F6005D4901EC1C2000|0|0|0xE00319FFFFBFFFFE|

with field separator "|", the 4th field is the date (date time), which i need to replace with -10 hours. i need a script urgently to do this. there are multiple files from different days, with each file containing about 500K lines of the above. Please help !

Sara Smilie
 

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ALEVT-DATE(1)							   Teletext time						     ALEVT-DATE(1)

NAME
alevt-date - display/set time received via Teletext SYNOPSIS
alevt-date [options] DESCRIPTION
alevt-date displays the time received from a Teletext source. It can be used to set the system time. The date is not interpreted (not even transmitted on most channels). So it allows only adjustment of +/-12 hours. The default allowed adjustment is limited to +/-2 hours (use -delta to change). Without the -set option it just displays the date in the format of the date(1) command. OPTIONS
A summary of options is included below. -set Set system time from time received via Teletext. -delta seconds Maximum allowed adjustment made to the system time. The default is 7200 seconds (2 hours) and the maximum that may be given is 12 hours. -format string Format string to used to print the time. Look at strftime(3) for possible control sequences. -vbi device Use the given device name (default: /dev/vbi0). -timeout seconds If the time can't be detected in seconds, the program is terminated with a SIGALRM. --help Show summary of options. --version Show version of program. Before starting this program, you have to set the TV channel with another program like xawtv of set-tv. Note: This program does not set the battery backed up clock of your computer. clock -w will do this. FILES
/dev/vbi* SEE ALSO
alevt(1x), alevt-cap(1), strftime(3), date(1), clock(8). BUGS
This program is just a toy. The time transmitted by the TV stations is more than inaccurate. Some are within a few seconds of your local time reference but others are more then 15 minutes off. You've been warned. (And don't assume the pkt8/30 time is better. It's even worse.) No bug reports to <froese@gmx.de> *g*. LINUX
1.6.2 ALEVT-DATE(1)
All times are GMT -4. The time now is 12:14 AM.
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