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Actually, quotes are only needed here if you want to add spaces or special characters but not if they are in the content of the variables. During assignment there is no expansion of the contents of...

@codemaniac: your shorter version doesn't work for the case below:


type of atoms z vz
Si 34 54
O 35 56
H 14 13
Si 40 17
O 65 18
H 70 19
Si 24 20
H 85 21
O 90 12
Si 12 34


The first...

echo $x | sed s/.$//