With files : 
file.1
file.02
file.003
file.5
file.00007
file.011

[download]
 
perl -e
 '/\.0*(\d+)$/and$t[$1]=1for<*>;map{$t[$c]?1:print"$c ";$c++}@t'

[download]
Output :
4 6 8 9 10

HTH,

PooLpi

'Ebry haffa hoe hab im tik a bush'.  Jamaican proverb

In reply to Re: one-line split file sequence checker by poolpi
in thread one-line split file sequence checker by wdef2

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