JOT(1) BSD General Commands Manual JOT(1)
jot -- print sequential or random data
jot [-cnr] [-b word] [-p precision] [-s string] [-w word] [reps [begin [end [s]]]]
The jot utility is used to print out increasing, decreasing, random, or redundant data (usu-
ally numbers) one per line.
The following options are available:
Just print word repetitively.
-c This is an abbreviation for -w %c.
-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 precisions of
begin and end. The -p option is overridden by whatever appears in a printf(3) con-
version following -w.
-r Generate random data instead of sequential data, the default.
Print data separated by string. Normally, newlines separate data.
Print word with the generated data appended to it. Octal, hexadecimal, 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.
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 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 ran-
dom 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 corresponding 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.
jot - 42 87 1
prints the integers from 42 to 87, inclusive.
jot 21 -1 1.00
prints 21 evenly spaced numbers increasing from -1 to 1.
jot -c 128 0
prints the ASCII character set.
jot -w xa%c 26 a
prints the strings ``xaa'' through ``xaz''.
jot -r -c 160 a z | rs -g 0 8
prints 20 random 8-letter strings.
jot -b y 0
is equivalent to yes(1).
jot -w %ds/old/new/ 30 2 - 5
prints thirty ed(1) substitution commands applying to lines 2, 7, 12, etc.
jot 0 9 - -.5
prints the stuttering sequence 9, 8, 8, 7, etc.
jot -b x 512 > block
creates a file containing exactly 1024 bytes.
expand -`jot -s, - 10 132 4`
sets tabs four spaces apart starting from column 10 and ending in column 132.
grep `jot -s "" -b . 80`
prints all lines 80 characters or longer.
ed(1), expand(1), rs(1), seq(1), yes(1), printf(3), random(3)
BSD January 5, 2010 BSD