How to iterate for loop with limiting sequence in fish shell

Question

I want to limit sequence in for loop. All my tries were unsecsessfull. What Am I doing wrong?

I thought that this should work:

for x in ((seq 100)[50..55])
  echo $x
end

An alternative with a `while` loop and without `seq`: `set i 50; set end 55; while [ $i -le $end ]; echo $i; set i (math $i + 1); end` — Cyrus, Feb 02 '22 at 20:50

score 55 · Accepted Answer · answered Mar 22 '16 at 06:00

55

With fish:

for i in (seq 50 55); echo "$i"; end

Output:

answered Mar 22 '16 at 06:00

Cyrus

84,225
14
89
153

thanks. Did you find it in fish shell documentation? – Michael Karavaev Mar 22 '16 at 06:07
3

You won't find it there because `seq` is not a fish thing - it's an external tool (see `type seq`). On GNU/Linux systems it's a part of GNU coreutils. – faho Mar 22 '16 at 10:52

score 5 · Answer 2 · answered Mar 22 '16 at 14:37

You have one too many pairs of parenthesis. In fish parenthesis do what $(command) and `command` do in bash or zsh. So just do

for x in (seq 100)[50..55]
    echo $x
end

And, of course, for this specific example you don't even need the slice notation since you can just tell the seq command to begin and end with the desired values.

How to iterate for loop with limiting sequence in fish shell

2 Answers2