# sort > Sort lines of text files. - Sort a file in ascending order: `sort {{filename}}` - Sort a file in descending order: `sort -r {{filename}}` - Sort a file using numeric rather than alphabetic order: `sort -n {{filename}}` - Sort the passwd file by the 3rd field, numerically: `sort -t: -k 3n /etc/passwd` - Sort a file preserving only unique lines: `sort -u {{filename}}` - Sort human-readable numbers (in this case the 5th field of `ls -lh`): `ls -lh | sort -h -k 5`