问题
In bash you can generate letter sequence easily as "{a..z}", for example
$ echo {a..z}
a b c d e f g h i j k l m n o p q r s t u v w x y z
How to do that in the fish shell instead?
回答1:
Fish doesn't support ranges in brace expansion, only comma-separated values: {a,b,c}.
Thus, we are forced to search for a command capable of generating such sequence. For example, you can use Perl:
for c in (perl -e '$,="\n"; print ("a" .. "z")')
printf ">> %s\n" "$c"
end
where $, is the output field separator.
Output
>> a
>> b
...(skipped)
>> y
>> z
You may find this table useful.
回答2:
One way is to use printf and seq.
echo -e (printf '\\\x%x\n' (seq 97 122))
This works by generating "\x61 \x62 \x63 ... \x7a" which is then interpreted by "echo -e" as hex character codes.
回答3:
Linux has the seq command for this, and it works with fishshell:
$ for f in (seq 1 10)
echo $f
end
1
2
3
4
5
6
7
8
9
10
$
来源：https://stackoverflow.com/questions/40943953/how-to-generate-letter-sequence-list-in-fish-shell