You can use the key option of the sort command, which takes a “field number”, so if you wanted the second column:
sort -k2 -n yourfile
-n,--numeric-sortcompare according to string numerical value
For example:
$ cat ages.txt Bob 12 Jane 48 Mark 3 Tashi 54 $ sort -k2 -n ages.txt Mark 3 Bob 12 Jane 48 Tashi 54
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