FLDS(1): print fields
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     USAGE

         usage: flds [-1Du] [-F sep] [-o sep] {-r range} {file}
             -1: fields separated by 1  run  of  the  field  delimiter
     string
             -D: debug
             -F sep: input field  delimiter  character(s)  (or  string
     under -1)
             -o sep: output field delimiter string
             -r range: print this range
             -u: use unix out

     DESCRIPTION

      Flds prints the requested fields for the given files. Fields are
     specified  as  ranges.  A  range  may  be  a  single line number,
     counting from 1, or  a  pair  of  start  and  end  field  numbers
     separated  by  a  ','  character.   Negative  field numbers count
     backwards from the end of the line (the last is -1 and so on).

     Multiple ranges may be given. A missing start number in  a  range
     means  1,  and  a  missing  end number in a range means -1. If no
     range  is  given,  ','  is  implied.  And,  when  such  range  is
     indicated, all fields are printed, one line at a time.

     By default the field separator  is  a  run  of  blanks.  Flag  -F
     changes  the  set  of  runes  used  as  field  separators  to its
     argument.

     Flag -1 indicates  that  fields  are  separated  exactly  by  one
     instance  of  the  separator  string.  Such  string defaults to a
     tabulator character in this case, unless -F says otherwise.

     Fields are printed in the order indicated  by  the  ranges  given
     (first  range gets printed first). Output fields are separated by
     default using a tab character or the sep string if -1 is used.

     EXAMPLES

     Print the first two fields and the last one from the ps output:

         ; ps | rf | flds -u -r 1,2 -r -1

     In a file with fields separated with ':', and, perhaps with empty
     fields, print just the first and third fields in reverse order:

         ; ps | rf | flds -u -1F: -r 3 -r 1

     Replace the field separator ':' with ',' in all files  under  the
     current directory and update those files on disk:

         ; gf , | flds -u -1F: -o, | pf -w

     SOURCE

     +o    /zx/sys/src/clive/cmd/flds

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      User's manual. Section 1. Copyright © LSUB 2014-2016