[d:abut files]              [s:a][p:abut][a:{files}]
[d:Count words and lines]   [s:c][p:wc][a:{files}]
[d:Compare two files]       [s:C][p:cmp][a:{files}]
[d:Permut lines in a file]  [s:p][p:perm][a:{file}][waitoff:]
[d:Reverse lines in a file] [s:r][p:rev][a:{file}]
[d:Sort lines in a file]    [s:s][p:sort][a:{key} {file}]
[d:Split a file into pieces][s:S][p:split][a:{file}]
[d:Topological sort]        [s:t][p:tsort][a:{arguments}]
[d:Unique line finder]      [s:u][p:uniq][a:{arguments}]
