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michaesp |
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.TH datelist
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.SH NAME
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.B datelist - handling of datelists
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.SH SYNOPSIS
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.B datelist
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.I filename
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.I mode
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.I [ parameters ]
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.SH DESCRIPTION
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A date list is a file of dates in the format {YYYYMMDD_HH}, e.g. 19900101_00 for 00 UTC, 1 January 1990. This command offers several ways how to create date lists and to work with them.
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.SH PARAMETERS
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.TP 10
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.I filename
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name of the date list file. If the name
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.B 'stdout'
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or
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.B 'screen'
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is given, the output will be directed to standardoutput: no file will be created.
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.TP 10
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.I mode
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one of several modes (see below).
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.SH CREATING DATE LISTS
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.TP 5
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.B -create stardate enddate
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create a datelist from startdate (in format {YYYYMMDD_HHMM}) to enddate; the time interval is per default 6 h (see option -interval). If the start and end date do not match with the analysis times, the date list will contain the enclosing analysis times: for instance, for
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.B -create 20100201_04 20100201_19
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the date list will contain the following dates: 20100201_00, 20100201_06, 20100201_12, 20100201_18, 20100202_00.
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.TP 5
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.B -indir dirname
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search for dates (in format {YYYYMMDD_HH}) in the direcory given with {dirname} - the dates are written in ascending order to the datelist file and repeating dates are removed.
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.TP 5
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.B -interval value
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change the interval to {value} hours, instead of the default 6 hours.
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.SH INFO ABOUT DATE LISTS
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.TP 5
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.B -ndates
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write the number of dates in the list
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.TP 5
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.B -timerange
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write the time range {last date} - {first date} [in hours].
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.TP 5
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.B -isin date
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check whether the date is in the list (1) or not (0).
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.SH STEPPING THROUGH DATE LISTS
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.TP 5
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.B -first
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write the first date of the date list
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.TP 5
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.B -last
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write the last date of the date list
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.TP 5
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.B -next date
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find the date {date} in the list and write the
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.B next
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date to screen; if no next date is in the list, i.e. the end of the list is reached, 'nil' will be returned.
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.TP 5
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.B -prev date
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find the date {date} in the list and write the
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.B previous
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date to screen; if no previous date is in the list, i.e. the beginning of the list is reached, 'nil' will be returned.
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.SH COMPARING DATE LISTS
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.TP 5
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.B -overlap file1 file1
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determine the overlap of two date lists.
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.TP 5
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.B -onlyin1 file1 file1
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determine the dates which only occur in date list 1, but not in datelist 2
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.TP 5
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.B -onlyin2 file1 file1
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determine the dates which only occur in date list 2, but not in datelist 1
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.SH Examples
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.TP 5
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.B [1] datelist screen -indir ./
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look for dates in the current directory and write them to screen
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.TP 5
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.B [2] datelist dates -create 19890101_00 20110101_00 -interval 2
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creates dates from 00 UTC, 1 January 1989 to 00 UTC, 1 January 2011 with an interval of 2 hours. The output will be written to the file 'dates'.
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.SH AUTHOR
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Written by Michael Sprenger and Heini Wernli (January 2011)
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