dc, 13 characters

[zpdA0>x]dsxx

Try it online!

dc, 14 characters

Thanks to

• Digital Trauma for the twist in using the stack depth efficiently (-2 characters)

[zpzA0!<m]dsmx

Try it online!

dc, 16 characters

0[pz+dA0>i]dsixp

Sample run:

bash-5.0$ dc -e '0[pz+dA0>i]dsixp' | head
0
1
2
3
4
5
6
7
8
9

Try it online!

dc, 13 characters

Thanks to

• Daemon for reusing stack depth instead of getting it again, to use shorter operator (-1 character)

[zpdA0>x]dsxx

Try it online!

dc, 14 characters

Thanks to

• Digital Trauma for the twist in using the stack depth efficiently (-2 characters)

[zpzA0!<m]dsmx

Try it online!

dc, 16 characters

0[pz+dA0>i]dsixp

Sample run:

bash-5.0$ dc -e '0[pz+dA0>i]dsixp' | head
0
1
2
3
4
5
6
7
8
9

Try it online!

dc, 14 characters

Thanks to

• Digital Trauma for the twist in using the stack depth efficiently (-2 characters)

[zpzA0!<m]dsmx

Try it online!

dc, 16 characters

0[pz+dA0>i]dsixp

Sample run:

bash-5.0$ dc -e '0[pz+dA0>i]dsixp' | head
0
1
2
3
4
5
6
7
8
9

Try it online!

dc, 13 characters

[zpdA0>x]dsxx

Try it online!

dc, 14 characters

Thanks to

• Digital Trauma for the twist in using the stack depth efficiently (-2 characters)

[zpzA0!<m]dsmx

Try it online!

dc, 16 characters

0[pz+dA0>i]dsixp

Sample run:

bash-5.0$ dc -e '0[pz+dA0>i]dsixp' | head
0
1
2
3
4
5
6
7
8
9

Try it online!

dc, 16 characters

0[pz+dA0>i]dsixp

Sample run:

bash-5.0$ dc -e '0[pz+dA0>i]dsixp' | head
0
1
2
3
4
5
6
7
8
9

Try it online!

dc, 14 characters

Thanks to

• Digital Trauma for the twist in using the stack depth efficiently (-2 characters)

[zpzA0!<m]dsmx

Try it online!

dc, 16 characters

0[pz+dA0>i]dsixp

Sample run:

bash-5.0$ dc -e '0[pz+dA0>i]dsixp' | head
0
1
2
3
4
5
6
7
8
9

Try it online!