196 lines
5.4 KiB
Groff
196 lines
5.4 KiB
Groff
.\" Copyright (c) 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)jot.1 8.1 (Berkeley) 6/6/93
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.\"
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.TH JOT 1 "June 6, 1993"
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.UC 4
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.SH NAME
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jot \- print sequential or random data
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.SH SYNOPSIS
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.B jot [
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options
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.B ] [
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\fRreps \fB[\fP begin \fB[\fP end \fB[\fP s \fB] ] ] ]\fP
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.SH DESCRIPTION
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.I Jot
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is used to print out increasing, decreasing, random,
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or redundant data, usually numbers, one per line.
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The
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.I options
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are understood as follows.
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.IP \fB\-r\fP
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Generate random data instead of sequential data, the default.
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.IP \fB\-b\fP\ word
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Just print
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.I word
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repetitively.
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.IP \fB\-w\fP\ word
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Print
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.IR word
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with the generated data appended to it.
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Octal, hexadecimal, exponential, ASCII, zero padded,
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and right-adjusted representations
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are possible by using the appropriate
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.IR printf (3)
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conversion specification inside
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.IR word ,
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in which case the data are inserted rather than appended.
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.IP \fB\-c\fP
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This is an abbreviation for \fB\-w %c\fP.
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.IP \fB\-s\fP\ string
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Print data separated by
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.IR string .
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Normally, newlines separate data.
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.IP \fB\-n\fP
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Do not print the final newline normally appended to the output.
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.IP \fB\-p\fP\ precision
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Print only as many digits or characters of the data
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as indicated by the integer
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.IR precision .
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In the absence of
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.BR \-p ,
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the precision is the greater of the precisions of
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.I begin
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and
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.IR end .
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The
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.B \-p
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option is overridden by whatever appears in a
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.IR printf (3)
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conversion following
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.BR \-w .
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.PP
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The last four arguments indicate, respectively,
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the number of data, the lower bound, the upper bound,
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and the step size or, for random data, the seed.
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While at least one of them must appear,
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any of the other three may be omitted, and
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will be considered as such if given as
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.BR \- .
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Any three of these arguments determines the fourth.
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If four are specified and the given and computed values of
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.I reps
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conflict, the lower value is used.
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If fewer than three are specified, defaults are assigned
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left to right, except for
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.IR s ,
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which assumes its default unless both
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.I begin
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and
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.I end
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are given.
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.PP
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Defaults for the four arguments are, respectively,
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100, 1, 100, and 1, except that when random data are requested,
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.I s
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defaults to a seed depending upon the time of day.
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.I Reps
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is expected to be an unsigned integer,
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and if given as zero is taken to be infinite.
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.I Begin
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and
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.I end
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may be given as real numbers or as characters
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representing the corresponding value in ASCII.
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The last argument must be a real number.
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.PP
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Random numbers are obtained through
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.IR random (3).
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The name
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.I jot
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derives in part from
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.IR iota ,
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a function in APL.
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.SH EXAMPLES
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.de IC
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.IP
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.ss 36
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.ft B
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..
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.de NC
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.br
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.ss 12
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.PP
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..
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.PP
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The command
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.IC
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jot 21 \-1 1.00
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.NC
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prints 21 evenly spaced numbers increasing from \-1 to 1.
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The ASCII character set is generated with
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.IC
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jot \-c 128 0
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.NC
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and the strings xaa through xaz with
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.IC
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jot \-w xa%c 26 a
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.NC
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while 20 random 8-letter strings are produced with
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.IC
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jot \-r \-c 160 a z | rs \-g 0 8
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.NC
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Infinitely many
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.IR yes 's
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may be obtained through
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.IC
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jot \-b yes 0
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.NC
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and thirty
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.IR ed (1)
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substitution commands applying to lines 2, 7, 12, etc. is
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the result of
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.IC
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jot \-w %ds/old/new/ 30 2 \- 5
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.NC
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The stuttering sequence 9, 9, 8, 8, 7, etc. can be
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produced by suitable choice of precision and step size,
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as in
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.IC
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jot 0 9 \- \-.5
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.NC
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and a file containing exactly 1024 bytes is created with
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.IC
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jot \-b x 512 > block
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.NC
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Finally, to set tabs four spaces apart starting
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from column 10 and ending in column 132, use
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.IC
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expand \-\`jot \-s, \- 10 132 4\`
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.NC
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and to print all lines 80 characters or longer,
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.IC
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grep \`jot \-s "" \-b . 80\`
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.NC
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.SH SEE ALSO
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ed(1), expand(1), rs(1), yes(1), printf(3), random(3), expand(1)
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