Remove the First N Characters From a Line

The following codes remove first 6 characters. Change the number accordingly...
cut -c7- ' this works
rr ^.{6} ' rr was not installed
colrm 1 6
rr s/^.{6}//
sed's/^.\{6\}//'
perl -pe's/^.{6}//'
ruby -pe'sub /^.{6}/,""'
gawk'BEGIN{FIELDWIDTHS="6 999"}{print$2}'

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