If any of the global options Mbdfinr are given but no key fields are specified, sort compares the entire lines according to the global options. GNU sort has no limits on input line length or restric- tions on bytes allowed within lines. In addition, if the final byte of an input file is not a newline, GNU sort silently supplies one. They may be specified globally or as part of a specific key field. Ignore leading blanks when finding sort keys in each line.
Invalid names compare low to valid names.
This option implies -b . Compare according to arithmetic value an initial numeric string consisting of optional white space, an optional - sign, and zero or more digits, optionally followed by a decimal point and zero or more digits. This option implies -b . Reverse the result of comparison, so that lines with greater key values appear earlier in the out- put instead of later. For the default case or the -m option, only output the first of a sequence of lines that compare equal.