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how to join all lines in afile in unix

 
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# 1  
Old 09-13-2012
how to join all lines in afile in unix
Hi,
I have a unix file which has many lines, i need to join all the lines to single line.
Eg: myfile.txt contains:
a
123
45fg
try

and i need the output as :
a 123 45fg try

Please help me on this.
Thanks!
# 2  
Old 09-13-2012
Code:
paste -sd' ' file

# 3  
Old 09-13-2012
Code:
tr '\n' ' ' < file

 
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