Security / Server Administration / Server Backup / Web Hosting
by James · Published September 4, 2017 · Last modified May 18, 2019
A backup is a copy of any kind of data, created as a replacement for situations when the original is lost or corrupted due to things like hard disk failure, accidental deletion, theft, flood,...
SSL stands for Secure Sockets Layer, an encryption technology that was originally created by Netscape in the 1990s. SSL is a standard security protocol for establishing encrypted links between a web server and a...
DNS / Server Administration / Web Hosting
by James · Published September 2, 2017 · Last modified February 16, 2019
Time To Live, or TTL for short, is the sort of expiration date that is put on a DNS record. The TTL serves to tell the recursive server or local resolver how long it...
DNS / Server Administration / Web Server
by James · Published September 2, 2017 · Last modified February 16, 2019
The most common DNS record types are: A (Host address) – A record is used to resolve Name (www.future4tech.com) to IP Address (180.57.53.20). It creates in Forward lookup zone. A record called as host...
DNS / Server Administration / Web Hosting
by James · Published September 1, 2017 · Last modified February 16, 2019
Domain name system converts the domain name to IP address. There are different types of DNS server available we can setup any of them as per our requirement. BIND: BIND is the reference implementation...
by James · Published September 1, 2017 · Last modified February 16, 2019
DNS stand for Domain Name System/Service. It’s used to resolve FQDN (Fully qualified domain name) to IP address and Vice versa such as www.example.com to 180.57.53.20 and vice versa. – Domain Name systems makes...
Conditionally perform a command.
|
1 2 3 4 |
File syntax IF [NOT] EXIST filename command IF [NOT] EXIST filename (command) ELSE (command) |
|
1 2 3 4 5 6 |
String syntax IF [/I] [NOT] item1==item2 command IF [/I] item1 compare-op item2 command IF [/I] item1 compare-op item2 (command) ELSE (command) |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 |
Error Check Syntax IF [NOT] DEFINED variable command IF [NOT] ERRORLEVEL number command IF CMDEXTVERSION number command key item A text string or environment variable, for more complex comparisons, a variable can be modified using either Substring or Search syntax. command The command to perform. filename A file to test or a wildcard pattern. NOT perform the command if the condition is false. == perform the command if the two strings are equal. /I Do a case Insensitive string comparison. compare-op can be one of EQU : Equal NEQ : Not equal LSS : Less than < LEQ : Less than or Equal <= GTR : Greater than > GEQ : Greater than or equal >= This 3 digit syntax is necessary because the > and < symbols are recognised as redirection operators |
IF will only parse numbers when one of (EQU, NEQ, LSS, LEQ, GTR, GEQ) is used.The == comparison operator always results in a string comparison. ERRORLEVEL There are two different methods of checking an...
Configure IP (Internet Protocol configuration)
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 |
Syntax IPCONFIG /all Display full configuration information. IPCONFIG /release [adapter] Release the IP address for the specified adapter. IPCONFIG /renew [adapter] Renew the IP address for the specified adapter. IPCONFIG /flushdns Purge the DNS Resolver cache. IPCONFIG /registerdns Refresh all DHCP leases and re-register DNS names. IPCONFIG /displaydns Display the contents of the DNS Resolver Cache. IPCONFIG /showclassid adapter Display all the DHCP class IDs allowed for adapter. IPCONFIG /setclassid adapter [classid] Modify the dhcp class id. |
If the Adapter name contains spaces, use quotes: “Adapter Name”Wildcard characters * and ? are allowed, see the examples below The default is to display only the IP...
Loop command: against a set of files – conditionally perform a command against each item.
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 |
Syntax FOR /F ["options"] %%parameter IN (filenameset) DO command FOR /F ["options"] %%parameter IN ("Text string to process") DO command Key options: delims=xxx The delimiter character(s) (default = a space) skip=n A number of lines to skip at the beginning of the file. (default = 0) eol=; Character at the start of each line to indicate a comment The default is a semicolon ; tokens=n Specifies which numbered items to read from each line (default = 1) usebackq Use the alternate quoting style: - Use double quotes for long file names in "filenameset". - Use single quotes for 'Text string to process' - Use back quotes for `command to process` Filenameset A set of one or more files, enclosed in parentheses (file1,file2). command The command to carry out, including any parameters. This can be a single command, or if you enclose it in (parentheses), several commands, one per line. %%parameter A replaceable parameter: in a batch file use %%G (on the command line %G) |
FOR /F processing of a text file consists of reading the file, one line of text at a...
Copy files and/or directory trees to another folder. XCOPY is similar to the COPY command except that it has additional switches to specify both the source and destination in detail. While still included in...
