sort: by multiple fields

라벨: Informatics
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sot by tab

sort -t $'\t' -k 3 -nr file.txt

sort --key=1,1 --key=2,2r --key=3,3 --key=4,4r
sort -k1,1 -k2,2r -k3,3 -k4,4r

as in the following transcript:

pax$ echo '5 3 2 9
3 4 1 7
5 2 3 1
6 1 3 6
1 2 4 5
3 1 2 3
5 2 2 3' | sort --key=1,1 --key=2,2r --key=3,3 --key=4,4r

1 2 4 5
3 4 1 7
3 1 2 3
5 3 2 9
5 2 2 3
5 2 3 1
6 1 3 6

Remember to provide the -n option if you want them treated as proper numbers (variable length), such as:

sort -n -k1,1 -k2,2r -k3,3 -k4,4r

Example: Sort the password file on the fifth field and ignore any leading blanks. Sort lines with equal values in field five on the numeric user ID in field three. Fields are separated by `:'.

sort -t : -k 5b,5 -k 3,3n /etc/passwd

sort -t : -n -k 5b,5 -k 3,3 /etc/passwd

sort -t : -b -k 5,5 -k 3,3n /etc/passwd

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라벨: Informatics