s6-portable-utils
Software
skarnet.org
 The s6-sort program 
 s6-sort sorts its input.
 Interface 
     s6-sort [ -b ] [ -c ] [ -f ] [ -r ] [ -u ] [ -0 ]
 -  s6-sort reads its stdin until EOF 
-  It sorts all the lines it read alphanumerically 
-  It prints the sorted lines to stdout and exits 0 
 Options 
 -  -b : ignore leading spaces and tabs at the beginning of each
line when sorting 
-  -c : suppresses normal output, just returns 0 if the output
would have been the same as the input and 1 otherwise 
-  -f : ignore case when sorting 
-  -r : reverse sort 
-  -u : suppresses duplicate lines 
-  -0 : input and output lines are separated by null characters
instead of newlines 
 Posixness 
 s6-sort is not suitable as a Single Unix
sort
program.