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' regexp ' and its front and back lines, plus the ' regexp ' before the first line# line number of rows (similar to "GREP-A1-B1")Sed-n-E '/regexp/{=;x;1!p;g;$! n;p;d;} ' -E H# Displays lines containing "AAA", "BBB" or "CCC" (in any order) Sed '/aaa/!d/bbb/!d/ccc/!d ' NBS P # The order of the strings does not affect the result # displays lines containing "

/** * 1, the null judgement of the string org.aphche.commons.lang.StringUtils */ Checks If a String is empty ("") or null. SYSTEM.OUT.PRINTLN (Stringutils.isempty (null)); True System.out.println (Stringutils.isempty ("")); True System.out.println (Stringutils.isempty ("")); False System.out.println (Stringutils.isempty ("Bob"));//False System.out.println (Stringutils.isempty ( " Bob ")); False //Checks If a String is whitespace, empty ("") or null. SYSTEM.OUT

(similar to "GREP-A1-B1")Sed-n-E '/regexp/{=;x;1!p;g;$! n;p;d;} ' -E H # Displays lines containing "AAA", "BBB" or "CCC" (in any order)Sed '/aaa/!d; /bbb/!d; The order of the/ccc/!d ' # string does not affect the result # Displays lines containing "AAA", "BBB" and "CCC" (in Fixed order)Sed '/aaa.*bbb.*ccc/!d ' # Displ

;} '-e' $! {H; d;} '-e x # when there is only one row in the file, no output # Only display rows matching Regular Expressions (simulate "grep ") Sed-n'/regexp/P' # method 1 Sed '/regexp /! D' # method 2 # Show only the rows that do not match the regular expression (simulate "grep-v ") Sed-n'/regexp /! P' # method 1, which corresponds to the preceding command Sed '/regexp/d' # method 2, similar syntax # Search for "regexp" and display the last line of the matched row, but n

:192.168.8.0/24Router segment VLAN6 IP:192.168.6.0/24Wireless VLAN11 IP:192.168.9.0/24each network segment gateway is 192.168.*.254The 23,24 of the first switch on each layer is configured for wireless access mode, 19,20,21,22 for the camera for access mode, and the first interface for each switch is configured as a cascadeVlan1 as the management interface for each switch3. Network ConfigurationRouter configuration==================================================================================

//tstringlist Common Methods and properties:varList:tstringlist; I:integer;beginList: = tstringlist.create; List.add (' STRINGS1 ');{Add}List.add (' Strings2 '); List.exchange (0,1);{permutation}List.insert (0,' STRINGS3 ');{Insert}I: = List.indexof (' STRINGS1 ');{The first occurrence of a position}List.sort;{sort}list.sorted: = True;{Specify sort}List.count;{Total}List.text;{text Collection}List.delete (0);{Delete, 0 is the first data}List.loadfromfile (' C:\tmp.txt ');{Open}List.savetofile ('

During development, we often use the built-in JDK keytool to create a self-issued certificate and save it to the keystore file. If you want to import a keystore to another keystore (such as installing it on another machine without overwriting files), what should you do? For example, we import the content with the alias Tomcat from AAA. jks to BBB. jks. The illusion is that the certificate is first exported from