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Full Discussion: sort / cut question
Top Forums Shell Programming and Scripting sort / cut question Post 302126861 by BearCheese on Friday 13th of July 2007 03:39:02 PM
Old 07-13-2007
Thank you!
Now I have a file with the content like this:
20070711172841 905994
20070711172822 905994
20070711171431 906608
20070711171412 906608
20070711171142 905994
20070711171140 905994
20070711171139 905994
20070711164813 905994

I would like to keep only one line where the second column is the same. But that line should be the most lastest entry (timestamp in 1st coloumn).
I tried command:
sort -u -k 2,2
but this keeps the oldest timestamp Smilie

I tought that -u suppress everything but the first match. The first match (that should be kept) should be :
20070711172841 905994

but my command magically keeps the oldest line:
20070711164813 905994

Could you please advise on why -u does not work as anticipated?

Thank you!
BearCheese
 

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look(1) 						      General Commands Manual							   look(1)

NAME
look - Finds lines in a sorted list SYNOPSIS
look [-df] [-tcharacter] string [file] The look command prints all lines in a sorted file that begin with string. OPTIONS
Uses dictionary order; only letters, digits, tabs, and spaces are used in comparisons. Searches without regard to case; treats uppercase and lowercase as equivalent. Ignores character and characters following it in the search string. If you specify look -tC ABCDE, the string ABCDE would become (in effect) AB, with CDE being ignored. This option is primarily for shell scripts, in which more than one string is being processed. DESCRIPTION
If no file is specified, look searches in the system word list /usr/share/dict/words, with the options -df assumed by default. The look command uses binary search. The -d and -f options affect comparisons as in sort. NOTES
In order to use the -f option, you must first sort file with the sort -f command; otherwise, look displays only lowercase items. If you do not specify -f, but specify a file (such as /usr/share/dict/words) that has been sorted with sort -f, look may not produce any output. EXAMPLES
To search a sorted file called sortfile for all lines that begin with the string as, enter: look as sortfile To search the system word list for all words beginning with smi, enter: look smi This might result in: smile smirk smith smithereens Smithfield Smithson smithy smitten FILES
System word list. SEE ALSO
Commands: grep(1), sort(1), spell(1) look(1)
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