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Full Discussion: conditional replacement
Top Forums Shell Programming and Scripting conditional replacement Post 302474989 by supervazi on Friday 26th of November 2010 06:42:57 AM
Old 11-26-2010
conditional replacement

Hi all,

I need a bash, sed, awk script or one liner to do the following task:

This is the format of a text file:
Code:
2010-06-11 20:01 902656 HOP-W-100412-1.doc
2010-11-05 18:01 364447 NEX-W-101104-1
2010-07-06 10:01 64512 Cerintele
2010-07-06 10:01 599420 content
2010-07-19 14:01 1785344 specifications.ppt
2010-05-03 13:01 542673 Attends
...

I need to delete from this file the lines where the date and time in the first two columns are older then a given date.
I think may be a good solution to replace the date and time with the format of date in seconds since 1970-01-01 00:00:00.
Code:
cut -d" " -f1,2 textfile.txt | date -f - +$s

This command is working, but I don't know how to replace the output in place.

After that may be using some kind of conditional grep...
Code:
grep -v ($1 < $myconstant) textfile.txt

- I know, this command isn't exist, just an example...

Thank you in advance,

vazi

Last edited by vbe; 11-26-2010 at 07:47 AM.. Reason: code tags please
 

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DATE(1) 						      General Commands Manual							   DATE(1)

NAME
date - print or set the date and time SYNOPSIS
date [-qsu] [[MMDDYY]hhmm[ss]] [+format] OPTIONS
-q Read the date from stdin -s Set the time (implicit for -q or a date string) -u Print the date as GMT -t Use this number of seconds instead of current time EXAMPLES
date # Print the date and time date 0221921610 # Set date to Feb 21, 1992 at 4:10 p.m. DESCRIPTION
With the -q flag or a numeric argument, date sets the GMT time and date. MMDDYY refers to the month, day, and year; hhmmss refers to the hour, minute and second. Each of the six fields must be exactly two digits, no more and no less. date always display the date and time, with the default format for the system. The -u flag request GMT time instead of local time. A format may be specified with a + followed by a printf-like string with the following options: %% % character %A Name of the day %B Name of the month %D mm/dd/yy %H Decimal hour on 2 digits %I Decimal hour modulo 12 on 2 digits %M Decimal minute on 2 digits %S Decimal seconds on 2 digits %T HH:MM:SS %U Decimal week number, Sunday being first day of week %W Decimal week number, Monday being first day of week %X Same as %T %Y Decimal year on 4 digits %Z Time Zone (if any) %a Abbreviated name of the day %b Abbreviated name of the month %c Appropriate date & time (default format) %d Decimal day of the month on 2 digits %e Same as %d, but a space replaces leading 0 %h Same as %b %j Decimal dey of the year on 3 digits %m Decimal month on 2 digits %n Newline character %p AM or PM %r 12-hour clock time with AM/PM %s Number of seconds since the epoch %t Tab character %w Decimal day of the week (0=Sunday) %x Same as %D %y Decimal year on 2 digits SEE ALSO
time(2), ctime(3), readclock(8). DATE(1)
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