NAME
jot —
print sequential or random
data
SYNOPSIS
jot |
[-cnr]
[-b word]
[-p
precision]
[-s
string]
[-w word]
[reps
[begin
[end
[s]]]] |
DESCRIPTION
The
jot utility is used to print out increasing, decreasing,
random, or redundant data (usually numbers) one per line.
The following options are available:
-
-
- -b
word
- Just print word repetitively.
-
-
- -c
- This is an abbreviation for -w
%c.
-
-
- -n
- Do not print the final newline normally appended to the
output.
-
-
- -p
precision
- 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) conversion
following -w.
-
-
- -r
- Generate random data instead of sequential data, the
default.
-
-
- -s
string
- Print data separated by string.
Normally, newlines separate data.
-
-
- -w
word
- 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 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 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.
EXAMPLES
The command:
jot - 42 87 1
prints the integers from 42 to 87, inclusive.
The command:
jot 21 -1 1.00
prints 21 evenly spaced numbers increasing from -1 to 1.
The command:
jot -c 128 0
prints the ASCII character set.
The command:
jot -w xa%c 26 a
prints the strings “xaa” through “xaz”.
The command:
jot -r -c 160 a z | rs -g 0 8
prints 20 random 8-letter strings.
The command:
jot -b y 0
is equivalent to
yes(1).
The command:
jot -w %ds/old/new/ 30 2 - 5
prints thirty
ed(1) substitution
commands applying to lines 2, 7, 12, etc.
The command:
jot 0 9 - -.5
prints the stuttering sequence 9, 8, 8, 7, etc.
The command:
jot -b x 512 > block
creates a file containing exactly 1024 bytes.
The command:
expand -`jot -s, - 10 132 4`
sets tabs four spaces apart starting from column 10 and ending in column 132.
The command:
grep `jot -s "" -b . 80`
prints all lines 80 characters or longer.
SEE ALSO
ed(1),
expand(1),
rs(1),
seq(1),
yes(1),
printf(3),
random(3)
HISTORY
The
jot utility first appeared in
4.2BSD.
AUTHORS
John A. Kunze