I tried to use sort utility and typed sort --help , read one of lines; its -k option, and part of it:
I am really not getting it
Anyone do me a useful favor to save me out of my ignorance ?
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All those options refine the behaviour of sort ; e.g. -n if set globally would try to interpret any field numerically, so 10 would sort after 9 . If specified for a single key field only, that field would be treated as a number, all others according to what was set globally (or the default).