2006-11-01, 18:41(+01), Loki Harfagr:
> Le Wed, 01 Nov 2006 17:05:15 +0000, Stephane CHAZELAS a écrit:
>
>> 2006-11-01, 15:58(+00), Casper H.S Dik:
>>> Janis Papanagnou <Janis_Papanagnou@hotmail.com> writes:
>>>
>>>>Stephane CHAZELAS wrote:
>>>>> 2006-11-1, 00:22(-05), Bill Marcum:
>>>>>
>>>>>>Some systems have the "seq" command:
>>>>>>for x in `seq 1 10`
>>>>>
>>>>> GNU systems, seq is a GNU only command. And that assumes the
>>>>> newline character is in IFS and that no digits are in IFS.
>>>
>>>>If one fiddles with IFS he should take care that any changed
>>>>IFS has just some well defined preferable local scope, take
>>>>some precautions to save/restore it, or define it for a single
>>>>command only.
>>>
>>>
>>> And who needs seq (for most purposes) when you have:
>>>
>>> `yes "" | cat -n | head -10`
>>>
>>>
>>> for 10 fill in any number.
>> [...]
>>
>> Note that neither yes nor cat -n nor head -10 are SUSv3 though
>> they are supported by most systems
>>
>> You can do:
>>
>> NL='
>> '
>>
>> yes() {
>> (
>> IFS=" "
>> printf '%s\n' "$*" |
>> sed -e :1 -e p -e b1
>> )
>> }
>>
>> cat_n() {
>> nl -ba -d "$NL"
>> }
>>
>> and do:
>>
>> yes "" | cat_n | head -n 10
>>
>> or:
>>
>> for x in 1 2 3 4 5 6 7 8 9 10
>
> Then, while at replacing 'yes' and 'act -n' to simulate 'seq'
> why not directly simulate 'seq' ?
> here follows a possible form, I guess Chris F.A. Johnson and/or
> youreslf will correct the possible holes in it :-)
[...]

#! /usr/bin/awk -f
BEGIN {
min=1
step = 1
max = ARGV[1]
if (ARGC > 2) {
min = max
max = ARGV[2]
}
if (ARGC > 3) step = ARGV[3]
if ((max - min) * step < 0) exit(1)
for (i = min; i*step <= max*step; i+=step)
printf "%.17g\n", i
exit(0)
}

--
Stéphane