what is the difference between 'sort -k1 file.txt' and 'sort -k1,1 file.txt'?

摘要

if a file contains multiple columns, seperated by comma, like this: aaa,1,4,4,5,7 bbb,1,4,9,1,2 Is there difference between 'sort -t, -k1 file.txt' and 'sort -t, -k1,1 file.txt'? though with the

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