seq.md

seq

sequence

print a sequence of numbers

---

References

• man seq

Synopsis

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

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

• 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.
• The sequence of numbers ends when the sum of the current number and INCREMENT 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.
• FORMAT must be suitable for printing one argument 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.

Options

• -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

Usage

Default

to Last

$ seq 3
1
2
3

First to Last

$ seq 4 6
4
5
6

Increment

$ seq 1 2 5
1
3
5

Equal Width

$ seq -w 0 50 100
000
050
100

Seperator

# whitespace
$ seq -s' ' 3
# same as
$ seq -s\  3
1 2 3

# tab "\t"
$ seq -s"`echo -e '\t'`" 3
# same as
$ seq -s"`echo -e "\t"`" 3
1       2       3

Format

$ seq -f'%3g' 3
  1
  2
  3

$ seq -f'prefix%03g' 3
prefix001
prefix002
prefix003