This patch fixes the seq fallback seq.in (but it also should apply
cleanly to seq) to properly handle negative step arguments.
(Note that seq won't work with any negative arguments unless you
source it because of the option parsing bug I posted about.)
--
Francis Avila
seq.in.diff follows:
--- ./seq.in 2007-02-08 12:38:58.000000000 -0500
+++ /Users/favila/seq.in 2007-03-06 12:07:43.000000000 -0500
@@ -45,4 +45,24 @@
end
end
-echo "for( i=$from; i<=$to ; i+=$step ) i;" | bc
+#Tries to replicate gseq (GNU coreutils) 6.7 behavior.
+# If $from <= $to and $step == 0, gseq prints $from forever. (!!)
+#
+# Could not replicate inconsistent behavior when $from > $to and
$step < 0
+# when ends exactly on $to:
+# > gseq 10 -.9 1
+# 10.0 9.1 8.2 7.3 6.4 5.5 4.6 3.7 2.8 1.9 #No 1.0
+# > gseq 2 -.1 1
+# 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 #But 1.0 here
+# Probably caused by base 2 fractional misrepresentation?
+# bc has no problem because it works in base 10.
+
+#POSIX bc doesn't have 'else'
+set -l bccmd "if ($step < 0) {
+ for( i=$from; i>=$to ; i+=$step ) i;
+}
+if ($step >= 0) {
+ for( i=$from; i<=$to ; i+=$step ) i;
+}"
+
+echo $bccmd | bc
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