alpha@omega:~> echo "#include " > foobar.c
alpha@omega:~> echo "int main(){" >> foobar.c
alpha@omega:~> echo -n "printf(" >> foobar.c
alpha@omega:~> echo -n \" >> foobar.c
alpha@omega:~> echo -n "Hello World!\n" >> foobar.c
alpha@omega:~> echo -n \" >> foobar.c
alpha@omega:~> echo ");" >> foobar.c
alpha@omega:~> echo "return -1;" >> foobar.c
alpha@omega:~> echo "}" >> foobar.c
alpha@omega:~> gcc foobar.c
alpha@omega:~> ./a.out
hello world!
alpha@omega:~> _