Linux and Unix sort command
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About sort
Syntax
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Sorts the lines in a text file.
sort [options]... [file]
| -b | Ignores spaces at beginning of the line. |
| -c | Check whether input is sorted; do not sort |
| -d | Uses dictionary sort order and ignores the punctuation. |
| -f | Ignores caps |
| -g | Ccompare according to general numerical value |
| -i | Ignores nonprinting control characters. |
| -k | Start a key at POS1, end it at POS2 (origin 1) |
| -m | Merges two or more input files into one sorted output. |
| -M | Treats the first three letters in the line as a month (such as may.) |
| -n | Sorts by the beginning of the number at the beginning of the line. |
| -o | Write result to FILE instead of standard output |
| -r | Sorts in reverse order |
| -s | Stabilize sort by disabling last-resort comparison |
| -t | Use SEP instead of non-blank to blank transition |
| -T | Uuse DIR for temporaries, not $TMPDIR or /tmp; multiple options specify multiple directories |
| -u | If line is duplicated only display once |
| -z | End lines with 0 byte, not newline |
| +fields | Sorts by fields , usually by tabs |
| filename | The name of the file that needs to be sorted. |
| -o outputfile | Sends the sorted output to a file. |
sort -r file.txt
Sort the file, file.txt in reverse order.