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28 .\" @(#)rs.1 8.2 (Berkeley) 12/30/93
35 .Nd reshape a data array
39 .Fl Oo Cm csCS Oc Ns Op Ar x
40 .Oo Cm kKgGw Oc Ns Op Ar N
43 .Op Ar rows Op Ar cols
47 utility reads the standard input, interpreting each line as a row
48 of blank-separated entries in an array,
49 transforms the array according to the options,
50 and writes it on the standard output.
51 With no arguments it transforms stream input into a columnar
52 format convenient for terminal viewing.
54 The shape of the input array is deduced from the number of lines
55 and the number of columns on the first line.
56 If that shape is inconvenient, a more useful one might be
57 obtained by skipping some of the input with the
60 Other options control interpretation of the input columns.
62 The shape of the output array is influenced by the
66 specifications, which should be positive integers.
67 If only one of them is a positive integer,
69 computes a value for the other which will accommodate
71 When necessary, missing data are supplied in a manner
72 specified by the options and surplus data are deleted.
73 There are options to control presentation of the output columns,
74 including transposition of the rows and columns.
76 The following options are available:
77 .Bl -tag -width indent
79 Input columns are delimited by the single character
87 but maximal strings of
91 Output columns are delimited by the single character
103 Fill in the rows of the output array using the columns of the
104 input array, that is, transpose the input while honoring any
110 Print the pure transpose of the input, ignoring any
122 but print the ignored lines.
124 The gutter width (inter-column space), normally 2, is taken to be
129 percent of the maximum column width added to it.
131 Consider each line of input as an array entry.
133 On lines having fewer entries than the first line,
134 use null entries to pad out the line.
135 Normally, missing entries are taken from the next line of input.
137 If there are too few entries to make up the output dimensions,
138 pad the output by recycling the input from the beginning.
139 Normally, the output is padded with blanks.
141 Print the shape of the input array and do nothing else.
142 The shape is just the number of lines and the number of
143 entries on the first line.
147 but also print the length of each line.
149 Right adjust entries within columns.
151 The width of the display, normally 80, is taken to be the positive
155 Do not trim excess delimiters from the ends of the output array.
157 Adapt column widths to fit the largest entries appearing in them.
162 transposes its input, and assumes one array entry per input line
163 unless the first non-ignored line is longer than the display width.
164 Option letters which take numerical arguments interpret a missing
165 number as zero unless otherwise indicated.
169 utility can be used as a filter to convert the stream output
170 of certain programs (e.g.,
179 into a convenient ``window'' format, as in
180 .Bd -literal -offset indent
184 This function has been incorporated into the
186 program, though for most programs with similar output
190 To convert stream input into vector output and back again, use
191 .Bd -literal -offset indent
195 A 10 by 10 array of random numbers from 1 to 100 and
196 its transpose can be generated with
197 .Bd -literal -offset indent
198 % jot \-r 100 | rs 10 10 | tee array | rs \-T > tarray
203 a file consisting of a multi-line vector with 9 elements per line
204 can undergo insertions and deletions,
205 and then be neatly reshaped into 9 columns with
206 .Bd -literal -offset indent
210 Finally, to sort a database by the first line of each 4-line field, try
211 .Bd -literal -offset indent
212 % rs \-eC 0 4 | sort | rs \-c 0 1
222 utility first appeared in
229 Handles only two dimensional arrays.
231 The algorithm currently reads the whole file into memory,
232 so files that do not fit in memory will not be reshaped.
234 Fields cannot be defined yet on character positions.
236 Re-ordering of columns is not yet possible.
238 There are too many options.
240 Multibyte characters are not recognized.
244 (2048) bytes are not processed and result in immediate termination of