Shell Programming and Scripting

sed -e 's/[A-Z]/ &/g' -e 's/[0-9].../ &/g' -e 's/^ //g' infile

sed 's/[^A-Z]*/& /g'

echo '[[HelloInCapitals]] or [[PharmaceuticalSocietyOfGreatBritainVBoots1952]]' | nawk -F'(\\[\\[)|(\\]\\])' '{for(i=2;i<=NF;i+=2) {gsub("[A-Z]", " &", $i);$i="[["substr($i,2)"]]"};print}' OFS=

while read line; do
 outline=""
 for i in $line; do
   case $i in
     "[["*) i=$(echo $i |sed 's/\([a-z]\)\([A-Z0-9]\)/\1 \2/g') ;;
   esac
   outline="$outline $i"
 done
 echo ${outline# }
done<infile

echo '[[HelloInCapitals]] or [[PharmaceuticalSocietyOfGreatBritainVBoots1952]]' | 
nawk -F'(\\[\\[)|(\\]\\])' '{for(i=2;i<=NF;i+=2) {gsub("[A-Z]", " &", $i);$i="[["substr($i,2)"]]"};print}' OFS=""

echo '[[HelloInCapitals]] or [[PharmaceuticalSocietyOfGreatBritainVBoots1952]]' | 
sed 's/[A-Z]/ &/g; s/\[ /\[/g'

echo '[[HelloInCapitals]] OrAnd [[PharmaceuticalSocietyOfGreatBritainVBoots1952]]' | nawk -F'(\\[\\[)|(\\]\\])' '{for(i=2;i<=NF;i+=2) {gsub("[A-Z]|[0-9][0-9]*", " &", $i);$i="[["substr($i,2)"]]"};print}' OFS=

echo '[[HelloInCapitals]] OrAnd [[PharmaceuticalSocietyOfGreatBritainVBoots1952]]' | sed 's/[A-Z]/ &/g; s/\[ /\[/g'
[[Hello In Capitals]]  Or And [[Pharmaceutical Society Of Great Britain V Boots1952]]