# Bash 的 seq 命令

seq [OPTION]... FIRST [INCREMENT] LAST

$ seq 1 10                  # 打印 1 到 10
1
2
3
4
5
6
7
8
9
10
$ seq -s , -10 10           # 打印 -10 到 10，使用 `,` 分隔，
-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9,10
$ seq -s , -w 10 -1 -10     # 打印 -10 到 10，使用 `,` 分隔，补零平衡宽度
010,009,008,007,006,005,004,003,002,001,000,-01,-02,-03,-04,-05,-06,-07,-08,-09,-10
$ seq -s - 1 2 10           # 打印 1 到 10，增量为 2，使用 `-` 分隔
1-3-5-7-9

SEQ(1)                           User Commands                          SEQ(1)

NAME
       seq - print a sequence of numbers

SYNOPSIS
       seq [OPTION]... LAST
       seq [OPTION]... FIRST LAST
       seq [OPTION]... FIRST INCREMENT LAST

DESCRIPTION
       Print numbers from FIRST to LAST, in steps of INCREMENT.

       Mandatory  arguments  to  long  options are mandatory for short options
       too.

       -f, --format=FORMAT
              use printf style floating-point FORMAT

       -s, --separator=STRING
              use STRING to separate numbers (default: \n)

       -w, --equal-width
              equalize width by padding with leading zeroes

       --help display this help and exit

       --version
              output version information and exit

       If FIRST or INCREMENT is omitted, it defaults to 1.  That is, an  omit‐
       ted  INCREMENT defaults to 1 even when LAST is smaller than FIRST.  The
       sequence of numbers ends when the sum of the current number and  INCRE‐
       MENT  would  become  greater than LAST.  FIRST, INCREMENT, and LAST are
       interpreted as floating point values.  INCREMENT is usually positive if
       FIRST is smaller than LAST, and INCREMENT is usually negative if  FIRST
       is  greater  than LAST.  INCREMENT must not be 0; none of FIRST, INCRE‐
       MENT and LAST may be NaN.  FORMAT must be suitable for printing one ar‐
       gument of type 'double'; it defaults to %.PRECf  if  FIRST,  INCREMENT,
       and  LAST  are  all  fixed point decimal numbers with maximum precision
       PREC, and to %g otherwise.

AUTHOR
       Written by Ulrich Drepper.

REPORTING BUGS
       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
       Report any translation bugs to <https://translationproject.org/team/>

COPYRIGHT
       Copyright © 2023 Free Software Foundation, Inc.   License  GPLv3+:  GNU
       GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
       This  is  free  software:  you  are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO
       Full documentation <https://www.gnu.org/software/coreutils/seq>
       or available locally via: info '(coreutils) seq invocation'

GNU coreutils 9.4                 April 2024                            SEQ(1)