xargs < file.txt # This is an easy way to join a file into one line

By OK -
ubu1404@ubuntu1404lb01:/tmp$ cat file
1
2
3
4
5
6
7
8
9
10
ubu1404@ubuntu1404lb01:/tmp$ xargs < file
1 2 3 4 5 6 7 8 9 10
ubu1404@ubuntu1404lb01:/tmp$ 

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