xref: /netbsd-src/usr.bin/jot/jot.1 (revision 48c051401bf22a25531f843e256d663b4ec23661)

.\"	$NetBSD: jot.1,v 1.17 2020/04/25 11:11:33 simonb Exp $
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.\"	@(#)jot.1	8.1 (Berkeley) 6/6/93
.\"
.Dd April 25, 2020
.Dt JOT 1
.Os
.Sh NAME
.Nm jot
.Nd print sequential or random data
.Sh SYNOPSIS
.Nm
.Op Fl cnr
.Op Fl b Ar word
.Op Fl p Ar precision
.Op Fl s Ar string
.Op Fl w Ar word
.Oo Ar reps
.Oo Ar begin
.Oo Ar end
.Op Ar s
.Oc
.Oc
.Oc
.Sh DESCRIPTION
The
.Nm jot
utility is used to print out increasing, decreasing, random,
or redundant data (usually numbers) one per line.
The default is to produce sequential data.
.Pp
The following options are available:
.Bl -tag -width indent
.It Fl b Ar word
Just print
.Ar word
repetitively.
.It Fl c
This is an abbreviation for
.Fl w Ar %c .
.It Fl n
Do not print the final newline normally appended to the output.
.It Fl p Ar precision
Print only as many digits or characters of the data
as indicated by the integer
.Ar precision .
In the absence of
.Fl p ,
the precision is the greater of the precisions of
.Ar begin
and
.Ar end .
The
.Fl p
option is overridden by whatever appears in a
.Xr printf 3
conversion following
.Fl w .
.It Fl r
Generate random data.
.It Fl s Ar string
Print data separated by
.Ar string .
Normally, newlines separate data.
.It Fl w Ar word
Print
.Ar word
with the generated data appended to it.
Octal, hexadecimal, exponential, ASCII, zero padded,
and right-adjusted representations
are possible by using the appropriate
.Xr printf 3
conversion specification inside
.Ar word ,
in which case the data are inserted rather than appended.
.El
.Pp
The last four arguments indicate, respectively,
the number of data, the lower bound, the upper bound,
and the step size or, for random data, the seed.
Any argument may be omitted, and
will be considered as such if given as
.Dq - .
Any three of these arguments determines the fourth.
If four are specified and the given and computed values of
.Ar reps
conflict, the lower value is used.
If fewer than three are specified, defaults are assigned
left to right, except for
.Ar s ,
which assumes its default unless both
.Ar begin
and
.Ar end
are given.
.Pp
When sequential data are requested the defaults for the four arguments
are 100 data, a lower bound of 1, an upper bound of 100 and a step size
of 1.
When random data are requested
.Ar s
defaults to a seed depending upon the time of day.
.Ar reps
is expected to be an unsigned integer,
and if given as zero is taken to be infinite.
.Ar begin
and
.Ar end
may be given as real numbers or as characters
representing the corresponding value in ASCII.
The last argument must be a real number.
.Pp
Random numbers are obtained through
.Xr random 3 .
The name
.Nm jot
derives in part from
.Nm iota ,
a function in APL.
.Sh EXAMPLES
The command:
.Dl "jot - 42 87 1"
prints the integers from 42 to 87, inclusive.
.Pp
The command:
.Dl "jot 21 \-1 1.00"
prints 21 evenly spaced numbers increasing from \-1 to 1.
.Pp
The command:
.Dl "jot \-c 128 0"
prints the ASCII character set.
.Pp
The command:
.Dl "jot \-w xa%c 26 a"
prints the strings
.Dq xaa
through
.Dq xaz .
.Pp
The command:
.Dl "jot \-r \-c 160 a z | rs \-g 0 8"
prints 20 random 8-letter strings.
.Pp
The command:
.Dl "jot \-b y 0"
is equivalent to
.Xr yes 1 .
.Pp
The command:
.Dl "jot \-w %ds/old/new/ 30 2 \- 5"
prints thirty
.Xr ed 1
substitution commands applying to lines 2, 7, 12, etc.
.Pp
The command:
.Dl "jot 0 9 \- \-.5"
prints the stuttering sequence 9, 8, 8, 7, etc.
.Pp
The command:
.Dl "jot \-b x 512 > block"
creates a file containing exactly 1024 bytes.
.Pp
The command:
.Dl "expand \-\`jot \-s, \- 10 132 4\`"
sets tabs four spaces apart starting
from column 10 and ending in column 132.
.Pp
The command:
.Dl "grep \`jot \-s """" \-b . 80\`"
prints all lines 80 characters or longer.
.Sh SEE ALSO
.Xr ed 1 ,
.Xr expand 1 ,
.Xr rs 1 ,
.Xr seq 1 ,
.Xr yes 1 ,
.Xr printf 3 ,
.Xr random 3
.Sh HISTORY
The
.Nm
utility first appeared in
.Bx 4.2 .
.Sh AUTHORS
.An John A. Kunze