Replace two or more spaces within a text file with a ;

Question

File1:

hello      world
foo   bar
a  word with a space

I need to replace all white spaces which are two or more in length with a semi-colon(;).

Result:

File2:

hello;world
foo;bar
a;word with a space

Answer 1

Try:

sed -e 's/  */;/g' file

Answer 2

sed -e 's/  \+/;/g' File1 > File2

Answer 3

$ gawk 'BEGIN{FS="  +"}{$1=$1}1' OFS=";" file
hello;world
foo;bar
a;word with a space

$ awk '{gsub(/  +/,";")}1' file
hello;world
foo;bar
a;word with a space