/usr/share/fish/functions/seq.fish is in fish-common 2.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | # If seq is not installed, then define a function that invokes __fish_fallback_seq
# We can't call type here because that also calls seq
if not command -s seq >/dev/null
# No seq command
function seq --description "Print sequences of numbers"
__fish_fallback_seq $argv
end
function __fish_fallback_seq --description "Fallback implementation of the seq command"
set -l from 1
set -l step 1
set -l to 1
switch (count $argv)
case 1
set to $argv[1]
case 2
set from $argv[1]
set to $argv[2]
case 3
set from $argv[1]
set step $argv[2]
set to $argv[3]
case '*'
printf (_ "%s: Expected 1, 2 or 3 arguments, got %d\n") seq (count $argv)
return 1
end
for i in $from $step $to
if not echo $i | grep -E '^-?[0-9]*([0-9]*|\.[0-9]+)$' >/dev/null
printf (_ "%s: '%s' is not a number\n") seq $i
return 1
end
end
if [ $step -ge 0 ]
echo "for( i=$from; i<=$to ; i+=$step ) i;" | bc
else
echo "for( i=$from; i>=$to ; i+=$step ) i;" | bc
end
end
end
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