Using sed:

sed '/[0-9]/!s/ //g' filename

This would remove spaces on all lines that do not contain a digit.

Using awk:

awk '/[^0-9]/{gsub(" ", "", $0)}1' filename

For removing the space only between the first two words:

sed -r '/[0-9]/!s/([^ ]+) ([^ ]+)/\1\2/' filename

Using sed:

sed '/[0-9]/!s/ //g' filename

This would remove spaces on all lines that do not contain a digit.

Using awk:

awk '!/[0-9]/{gsub(" ", "", $0)};1' filename

For removing the space only between the first two words (here using GNU sed for -r, use -E instead on BSDs):

sed -r '/[0-9]/!s/([^ ]+) ([^ ]+)/\1\2/' filename

Using sed:

sed '/[0-9]/!s/ //g' filename

This would remove spaces on all lines that do not contain a digit.

For removing the space only between the first two words:

sed -r '/[0-9]/!s/([^ ]+) ([^ ]+)/\1\2/' filename

Using sed:

sed '/[0-9]/!s/ //g' filename

This would remove spaces on all lines that do not contain a digit.

Using awk:

awk '/[^0-9]/{gsub(" ", "", $0)}1' filename

For removing the space only between the first two words:

sed -r '/[0-9]/!s/([^ ]+) ([^ ]+)/\1\2/' filename