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JOT(1) OpenBSD Reference Manual JOT(1)
jot - print sequential or random data
jot [-cnr] [-b word] [-w word] [-s string] [-p precision] [reps [begin
jot is used to print out increasing, decreasing, random, or redundant da-
ta, usually numbers, one per line.
The options are as follows:
-r Generate random data instead of sequential data, the default.
Just print word repetitively.
Print word with the generated data appended to it. Octal, hex-
adecimal, exponential, ASCII, zero padded, and right-adjusted
representations are possible by using the appropriate printf(3)
conversion specification inside word, in which case the data is
inserted rather than appended.
-c This is an abbreviation for -w %c.
Print data separated by string. Normally, newlines separate data.
-n Do not print the final newline normally appended to the output.
Print only as many digits or characters of the data as indicated
by the integer precision. In the absence of -p, the precision is
the greater of the numbers begin and end. The -p option is over-
ridden by whatever appears in a printf(3) conversion following
The last four arguments indicate, respectively, the number of da-
ta, the lower bound, the upper bound, and the step size or, for
random data, the seed. While at least one of them must appear,
any of the other three may be omitted, and will be considered as
such if given as `-'. Any three of these arguments determines the
fourth. If four are specified and the given and computed values
of reps conflict, the lower value is used. If fewer than three
are specified, defaults are assigned left to right, except for s,
which assumes its default unless both begin and end are given.
Defaults for the four arguments are, respectively, 100, 1, 100,
and 1, except that when random data are requested, s defaults to
a seed depending upon the time of day. reps is expected to be an
unsigned integer, and if given as zero is taken to be infinite.
begin and end may be given as real numbers or as characters rep-
resenting the corresponding value in ASCII. The last argument
must be a real number.
Random numbers are obtained through random(3). The name jot de-
rives in part from iota, a function in APL.
jot 21 -1 1.00
prints 21 evenly spaced numbers increasing from -1 to 1. The ASCII char-
acter set is generated with
jot -c 128 0
and the strings xaa through xaz with
jot -w xa%c 26 a
while 20 random 8-letter strings are produced with
jot -r -c 160 a z | rs -g jot0 0jot1
Infinitely many yes(1)'s may be obtained through
jot -b yes 0
and thirty ed(1) substitution commands applying to lines 2, 7, 12, etc.
is the result of
jot -w %ds/old/new/ 30 2 - 5
The stuttering sequence 9, 9, 8, 8, 7, etc. can be produced by suitable
choice of precision and step size, as in
jot 0 9 - -.5
and a file containing exactly 1024 bytes is created with
jot -b x 512 > block
Finally, to set tabs four spaces apart starting from column 10 and ending
in column 132, use
expand -`jot -s, - 10 132 4`
and to print all lines 80 characters or longer,
grep `jot -s -b. 80`
ed(1), expand(1), rs(1), yes(1), printf(3), random(3),
OpenBSD 2.6 June 6, 1993 2
Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.
(Corrections, notes, and links courtesy of RocketAware.com)
FreeBSD Sources for jot(1)
OpenBSD sources for jot(1)
Up to: File System Access
Up to: Random Numbers
Up to: Combinations and Permutations
Up to: Software Debugging and Testing
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