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Top Forums UNIX for Dummies Questions & Answers Help with grepping within variables Post 302312057 by chris_rabz on Thursday 30th of April 2009 09:27:02 AM
Old 04-30-2009
Help with grepping within variables

I've got a script at the moment that looks like this:

Code:
if [ $submenunum -eq 6 ]
        then
                echo "How many hours would you like users to have logged in for? (single digits)"
                read hours
                tim=
                echo "These are the users who were logged in for $hours hours:"
                echo "$tim"
        fi

For the 6th option in this particular menu script I'm trying to get the following command:

Code:
last | grep '(02:'

to fetch from the last file all logins of a certain amount of hours, but I am trying to provoke the user to type in the particular amount of hours they want to see. So where I have the variable tim, I expected this to work:

Code:
tim=$(last | grep '(0$hours:')

but it doesn't seem to want to comprehend having an open bracket inside the grep, without a closed one. It does work without the brackets, but then shows not only the login lengths matching the hours, but also the actual timestamps aswell, which I don't want.

How can I make the grep work inside the variable?

Cheers for any help in advance, and since this is my first query here and may have some more, is it better to create a new topic each time or shall I continue to use this thread?
 

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TIMETRANS(1p)						User Contributed Perl Documentation					     TIMETRANS(1p)

NAME
timetrans - Converts time into time SYNOPSIS
timetrans [units-options] [-count] DESCRIPTION
timetrans converts time from one type of unit to another. If any of the units options are specified, then timetrans will convert those time units into the number of seconds to which they add up. If given the count option, timetrans will convert that number of seconds into the appropriate number of weeks, days, hours, minutes, and seconds. The converted result is printed out. Units options cannot be specified in the same execution as the count option, and vice versa. timetrans is intended for use with DNSSEC-Tools, for calculating a zone's expiration time. OPTIONS
Units Options The converted value of each unit is totaled and a single result printed. -seconds seconds Count of seconds to convert to seconds. -minutes minutes Count of minutes to convert to seconds. -hours hours Count of hours to convert to seconds. -days days Count of days to convert to seconds. -weeks weeks Count of weeks to convert to seconds. Count Option The specified seconds count is converted to the appropriate number of weeks, days, hours, minutes, and seconds. -count seconds Count of seconds to convert to the appropriate set of units. Other Options timetrans has the following miscellaneous options. -Version Displays the version information for timetrans and the DNSSEC-Tools package. EXAMPLES
Example 1: Converting 5 days into seconds $(42)> timetrans -days 5 432000 Example 2: Converting 2 weeks into seconds $(43)> timetrans -w 2 1209600 Example 3: Converting 8 days and 8 hours into seconds $(44)> timetrans -d 8 -hours 8 720000 Example 4: Converting 1 week, 1 day, and 8 hours into seconds $(46)> timetrans -w 1 -days 1 -h 8 720000 Example 5: Converting 14 weeks, 4 days, 21 hours, 8 minutes, and 8 seconds into seconds $(47)> timetrans -w 14 -d 4 -h 21 -m 8 -s 8 8888888 Example 6: Converting 720000 seconds into time units $(48)> timetrans -c 720000 1 week, 1 day, 8 hours Example 7: Converting 1814421 seconds into time units $(49)> timetrans -c 1814421 3 weeks, 21 seconds Example 8: Converting 8888888 seconds into time units $(50)> timetrans -c 8888888 14 weeks, 4 days, 21 hours, 8 minutes, 8 seconds COPYRIGHT
Copyright 2004-2012 SPARTA, Inc. All rights reserved. See the COPYING file included with the DNSSEC-Tools package for details. AUTHOR
Wayne Morrison, tewok@tislabs.com SEE ALSO
zonesigner(8) Net::DNS::SEC::Tools::timetrans.pm(3) perl v5.14.2 2012-06-21 TIMETRANS(1p)
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