sed 's/./&\n/g' ids.txt | sort | uniq # Produce a list of all the unique characters used in a file. Useful if you need to try to figure out the expected character set and can't find a documented standard.
@climagic can't you use sort -u instead of having to pipe the output through uniq?
@Absinthe @climagic I think both ways work. sort -u is probably faster but sort | uniq feels more "unixy" :-)
@remaster @climagic I will have to mull it around and chew on it a bit to see if is tastes and smells unixy :)
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@Absinthe @climagic I think both ways work. sort -u is probably faster but sort | uniq feels more "unixy" :-)