.TH LOOK 1 .SH NAMElook \- find lines in a sorted list.SH SYNOPSIS.B look[.B \-df]string[ file ].SH DESCRIPTION.I Lookconsults a sorted.I fileand prints all lines that begin with.IR string .It uses binary search..PPThe options .B dand.B faffect comparisons as in.IR  sort (1):.TP 4.B  d`Dictionary' order:only letters, digits,tabs and blanks participate in comparisons..TP 4.B  fFold.Upper case letters compare equal to lower case..PPIf no.I fileis specified,.I /usr/dict/wordsis assumed with collating sequence.B \-df..SH FILES/usr/dict/words.SH "SEE ALSO"sort(1), grep(1)