Sort

• -u unique
• -f ignore case
  fold lower case to upper case characters
• -b –ignore-leading-blanks
  ignore leading blanks
• -n –numeric-sort
  compare according to string numerical value
• -t –field-separator=SEP
  use SEP instead of non-blank to blank transition
• -k –key=POS1[,POS2]
  start a key at POS1, end it at POS2 (origin 1)

-t -k 经常配合使用

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$ cat fruit.txt
banana:30:5.5
apple:10:2.5
pear:90:2.3
orange:20:3.4

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$ sort -n -k 2 -t : fruit.txt
apple:10:2.5
orange:20:3.4
banana:30:5.5
pear:90:2.3

• -r –reverse
  reverse the result of comparisons