check if one string comes before another

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look

look(1) 						      General Commands Manual							   look(1)

NAME

       look - Finds lines in a sorted list

SYNOPSIS

       look [-df] [-tcharacter] string [file]

       The look command prints all lines in a sorted file that begin with string.

OPTIONS

       Uses  dictionary  order; only letters, digits, tabs, and spaces are used in comparisons.  Searches without regard to case; treats uppercase
       and lowercase as equivalent.  Ignores character and characters following it in the search string.  If  you  specify  look  -tC  ABCDE,  the
       string  ABCDE  would  become  (in  effect)  AB, with CDE being ignored.	This option is primarily for shell scripts, in which more than one
       string is being processed.

DESCRIPTION

       If no file is specified, look searches in the system word list /usr/share/dict/words, with the options -df assumed by default.

       The look command uses binary search.

       The -d and -f options affect comparisons as in sort.

NOTES

       In order to use the -f option, you must first sort file with the sort -f command; otherwise, look displays only lowercase items.

       If you do not specify -f, but specify a file (such as /usr/share/dict/words) that has been sorted with sort -f, look may  not  produce  any
       output.

EXAMPLES

       To search a sorted file called sortfile for all lines that begin with the string as, enter: look as sortfile To search the system word list
       for all words beginning with smi, enter: look smi

	      This might result in: smile smirk smith smithereens Smithfield Smithson smithy smitten

FILES

       System word list.

SEE ALSO

       Commands:  grep(1), sort(1), spell(1)

																	   look(1)

Shell Programming and Scripting