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Annotation of 43BSDTahoe/new/help/src/f77/sort_files, revision 1.1

1.1     ! root        1: .TI F77/SORT_FILES "Sep. 4, 1985"
        !             2: Sorting Data in Files
        !             3: 
        !             4: Sorting of files can be done with the UNIX sort utility, for example:
        !             5: 
        !             6:        sort unsrt > srt
        !             7: 
        !             8: sorts the data in file 'unsrt' and writes the sorted records onto file
        !             9: \&'srt'.  The records are sorted in ascending order using the entire
        !            10: record as a sort key.
        !            11: 
        !            12: It is also possible to sort specifying keys by fields.  The default is
        !            13: that fields are nonblank nonempty strings separated by blanks.  For
        !            14: example, to sort on the second field separated by blanks (fields separated
        !            15: by single blanks):
        !            16: 
        !            17:        sort +1 -2 unsrt > srt
        !            18: 
        !            19: You can also specify sorting by specific columns, e.g.:
        !            20: 
        !            21:        sort -tx +0.19 -0.29 unsrt > srt
        !            22: 
        !            23: sorts using columns 20-29 as a sort key.  0.19 means to skip 0 fields and
        !            24: then skip 19 characters; thus it points at character 20; 0.29 similarly
        !            25: points to character 30.  +0.19 -0.29 means that the sort key starts in
        !            26: column 20 and ends before column 30; i.e. the sort key is columns
        !            27: 20-29.  The '-tx' forces sort to consider the first column of the
        !            28: first field to be in column one, otherwise it considers it to be the
        !            29: first nonblank column.
        !            30: 
        !            31: Sorts can be done from within an f77 program by using the
        !            32: subroutine system() which causes a UNIX command to be executed.
        !            33: For example:
        !            34: 
        !            35: .nf
        !            36:        open(8,file='unsrt')
        !            37:         ... code writing data creating unsorted file ...
        !            38:        close(8)
        !            39:        call system('sort +0.19 -0.29 unsrt > srt ')
        !            40:        open(8,file='srt')
        !            41:         ... code reading sorted data ...
        !            42: .fi

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