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I have something like this:

a line here;
a new line here;
another line here;

and I want it to be like, where all lines are combined into a single line.

a line here;a new line here;another line here;
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up vote 3 down vote accepted

tr -d '\n' <filename> will delete all newlines in the given file.

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1  
+1 for not resorting to perl for something so simple. – mkaito Oct 27 '12 at 19:40

Perl solution:

perl -pechomp file1 > file2
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(Just in case someone on Windows needs this.) In PowerShell it's

-join (Get-Content filename)

or shorter:

-join(gc filename)
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