jot - print sequential or random data
jot [-rbwcn] [-s string] [-p precision] [reps] [begin] [end] [s]
Jot prints increasing, decreasing, random, or redundant data, usually
numbers, one per line. The default is sequential data.
Jot's stdout is usually used as input to a pipeline or to compress
repetitive strings in an argument list.
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. 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 speci-
fied 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 representing the corre-
sponding value in ASCII. The last argument must be a real number.
Random numbers are obtained through random(3).
The name jot derives in part from iota, a function in APL.
-r Generate random, instead of sequential data.
Print only 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 are
inserted rather than appended.
This is an abbreviation for -w %c.
-s Print data separated by string. Normally, newlines separate
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 precisions of begin and end. The -p
option is overridden by whatever appears in a printf(3) conver-
sion following -w.
jot 21 -1 1.00
Prints 21 evenly spaced numbers increasing from -1 to 1.
jot -c 128 0
Generated ASCII character set.
jot -w xa%c 26 a
Generate the strings "xaa" through "xaz".
jot -r -c 160 a z | rs -g 0 8
Generate 20 random 8-letter strings.
jot -b yes 0
Infinitely many "yes"'s, as yes(1).
jot -w %ds/old/new/ 30 2 - 5
Output thirty ed(1) substitution commands applying to lines 2,
7, 12, etc. to convert old to new.
jot - 9 0 -.5
By suitable choice of precision and step size we produce a stut-
tering sequence 9, 9, 8, 8, 7, 7 and so on.
jot -b x 512 >block
The file block contains exactly 1024 bytes (512 "x0(rq's).
expand -`jot -s, - 10 132 4`
To set tabs four spaces apart starting from column 10 and ending
in column 132.
grep `jot -s "" -b . 80`
Output all lines 80 characters or longer,
John Kunze, updates by KS Braunsdorf, NPCGuild.org
rs(1l), ed(1), yes(1), printf(3), random(3), expand(1)