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[rocrocket@rocrocket programming]$ cat height.txt
1.79 1.83
1.65 1.59
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[rocrocket@rocrocket programming]$ tr 1 2 < height.txt
2.79 2.83
2.65 2.59
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[rocrocket@rocrocket programming]$ tr ‘ ‘ ‘\11′ < height.txt
1.79    1.83
1.65    1.59
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[rocrocket@rocrocket programming]$ tr ‘ ‘ ‘\11′ < height.txt |sed -n l
1.79\t1.83$
1.65\t1.59$
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