Usage: seq [OPTION]… LAST
or: seq [OPTION]… FIRST LAST
or: seq [OPTION]… FIRST INCREMENT LAST
Print numbers from FIRST to LAST, in steps of INCREMENT.
-f, –format=FORMAT use printf style floating-point FORMAT (default: %g)
-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
omitted INCREMENT defaults to 1 even when LAST is smaller than FIRST.
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.
When given, the FORMAT argument must contain exactly one of
the printf-style, floating point output formats %e, %f, %g
demo1#seq -f “%3g+” 0 9
0+
1+
2+
3+
4+
5+
6+
7+
8+
9+
格式化并将前面填充三个空格
demo2#seq -f “%3g” -s, 0 9
0, 1, 2, 3, 4, 5, 6, 7, 8, 9
分割符，默认为\n
demo3#seq -s, -w 0 10
00,01,02,03,04,05,06,07,08,09,10
填充前置0和最大值一样的位宽
小提示：-w 和 -f不能一起使用，想想其实也是