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.\" $NetBSD: seq.1,v 1.8 2013/04/07 17:37:45 jdf Exp $
.\"
.\" Copyright (c) 2005 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Brian Ginsbach.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd June 20, 2020
.Dt SEQ 1
.Os
.Sh NAME
.Nm seq
.Nd print sequences of numbers
.Sh SYNOPSIS
.Nm
.Op Fl w
.Op Fl f Ar format
.Op Fl s Ar string
.Op Fl t Ar string
.Op Ar first Op Ar incr
.Ar last
.Sh DESCRIPTION
The
.Nm
utility prints a sequence of numbers, one per line
.Pq default ,
from
.Ar first
.Pq default 1 ,
to near
.Ar last
as possible, in increments of
.Ar incr
.Pq default 1 .
When
.Ar first
is larger than
.Ar last ,
the default
.Ar incr
is -1.
.Pp
All numbers are interpreted as floating point.
.Pp
Normally integer values are printed as decimal integers.
.Pp
The
.Nm
utility accepts the following options:
.Bl -tag -width Ar
.It Fl f Ar format , Fl -format Ar format
Use a
.Xr printf 3
style
.Ar format
to print each number.
Only the
.Cm A ,
.Cm a ,
.Cm E ,
.Cm e ,
.Cm F ,
.Cm f ,
.Cm G ,
.Cm g ,
and
.Cm %
conversion characters are valid, along with any optional
flags and an optional numeric minimum field width or precision.
The
.Ar format
can contain character escape sequences in backslash notation as
defined in
.St -ansiC .
The default is
.Cm %g .
.It Fl s Ar string , Fl -separator Ar string
Use
.Ar string
to separate numbers.
The
.Ar string
can contain character escape sequences in backslash notation as
defined in
.St -ansiC .
The default is
.Cm \en .
.It Fl t Ar string , Fl -terminator Ar string
Use
.Ar string
to terminate sequence of numbers.
The
.Ar string
can contain character escape sequences in backslash notation as
defined in
.St -ansiC .
This option is useful when the default separator
does not contain a
.Cm \en .
.It Fl w , Fl -fixed-width
Equalize the widths of all numbers by padding with zeros as necessary.
This option has no effect with the
.Fl f
option.
If any sequence numbers will be printed in exponential notation,
the default conversion is changed to
.Cm %e .
.El
.Sh EXIT STATUS
.Ex -std
.Sh EXAMPLES
Generate a sequence from 1 to 3 (included) with a default increment of 1:
.Bd -literal -offset indent
# seq 1 3
1
2
3
.Ed
.Pp
Generate a sequence from 3 to 1 (included) with a default increment of -1:
.Bd -literal -offset indent
# seq 3 1
3
2
1
.Ed
.Pp
Generate a sequence from 0 to 0.1 (included) with an increment of 0.05 and padding
with leading zeroes.
.Bd -literal -offset indent
# seq -w 0 .05 .1
0.00
0.05
0.10
.Ed
.Pp
Generate a sequence from 1 to 3 (included) with a default increment of 1,
a custom separator string and a custom terminator:
.Bd -literal -offset indent
# seq -s "-->" -t "[end of list]\\n" 1 3
1-->2-->3-->[end of list]
.Ed
.Pp
Generate a sequence from 1 to 2 (included) with an increment of 0.2 and
print the results with two digits after the decimal point (using a
.Xr printf 3
style format):
.Bd -literal -offset indent
# seq -f %.2f 1 0.2 2
1.00
1.20
1.40
1.60
1.80
2.00
.Ed
.Sh SEE ALSO
.Xr jot 1 ,
.Xr printf 1 ,
.Xr printf 3
.Sh HISTORY
The
.Nm
command first appeared in Version\~8
.At .
A
.Nm
command appeared in
.Nx 3.0 ,
and was ported to
.Fx 9.0 .
This command was based on the command of the same name in
Plan 9 from Bell Labs and the GNU core utilities.
The GNU
.Nm
command first appeared in the 1.13 shell utilities release.
.Sh BUGS
The
.Fl w
option does not handle the transition from pure floating point
to exponent representation very well.
The
.Nm
command is not bug for bug compatible with other implementations.
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