11To do… Use the command… RemarksDisable the multi-screen displayfunction screen-length disableRequiredBy default, a login user uses thesettings of the screen-lengthcommand. The default settings of thescreen-length command are:multiple-screen display is enabledand up to 24 lines are displayed onthe next screen.This command is executed in userview, and takes effect for the currentuser only. When the user re-logs intothe switch, the default configurationis restored.Filtering output informationIntroductionYou can use regular expressions in display commands to filter output information.The following methods are available for filtering output information:• Enter the begin, exclude, or include keyword plus a regular expression in the display command tofilter the output information.• When the system displays the output information in multiple screens, use /, - or + plus a regularexpression to filter subsequent output information. / equals the keyword begin, - equals thekeyword exclude, and + equals the keyword include.The following definitions apply to the begin, exclude, and include keywords:• begin: Displays the first line that matches the specified regular expression and all lines that follow.• exclude: Displays all lines that do not match the specified regular expression.• include: Displays all lines that match the specified regular expression.A regular expression is a case-sensitive string of 1 to 256 characters. It supports the following specialcharacters.Character Meaning Remarks^string Starting sign. Matches a line thatstarts with string.For example, regular expression “^user” matches aline beginning with “user”, not “Auser”.string$ Ending sign. Matches a line thatends with string.For example, regular expression "user$” matches aline ending with “user”, not “userA”..Matches any single character, suchas a single character, a specialcharacter, and a blank.For example, “s” matches both “as” and “bs”.*Matches the preceding character orcharacter group zero or multipletimes.For example, “zo*” matches “z” and “zoo”;“(zo)*” matches “zo” and “zozo”.+Matches the preceding character orcharacter group one or multipletimesFor example, “zo+” matches “zo” and “zoo”, butnot “z”.
