some_variable="rs-123.host.com";# declare and define variablecase$some_variableinab*.host.com)echo"First 2 characters were ab";;# the command below stays the same 上面的命令与我们上面使用的更复杂的 case 结构相同。 在If-Else 结构中使
The pattern will match if it matches any part of the string. Anchor the pattern using the ‘^’ and ‘$’ regular expression operators to force it to match the entire string. The array variable BASH_REMATCH records which parts of the string matched the pattern. The element of BASH_REMATC...
- Test if a given variable is equal/not equal to the specified string: [[ $variable ==|!= "string" ]] - Test if a given string conforms the specified glob/regex: [[ $variable ==|=~ pattern ]] - Test if a given variable is [eq]ual/[n]ot [e]qual/[g]reater [t]han/[l]...
#!/bin/bash if [ $# != 1 ] then echo "USAGE: . snmp [HOST]" exit 1 fi TARGET=$1 echo "[*] Running SNMP enumeration on '$TARGET'" for comm_string in \ `msfcli auxiliary/scanner/snmp/snmp_login RHOSTS=$TARGET E 2> /dev/null\ | awk -F\' '/access with community/ { prin...
The variable 'regex' is defined to store the regular expression for email validation. Test cases: An array 'emails' is created to hold various email addresses to be tested against the regex. Function definition: test_email function: Takes an email address as an argument. Checks if the email...
连接操作符 (,) 选择操作符 \n 反向引用
boolean matches(String regex) 通知此字符串是否匹配给定的正则表达式。 String str = "123456"; String re = "\\d+"; if (str.matches(re)) { // do something } Pattern类和Matcher类 String str = "abc efg ABC"; String re = "a|f"; //表示a或f ...
if [ -z “$emptystring” ]; then It is a string-based condition, and this statement allows you to check a string or compare multiple strings. This condition is true only if the $emptystring is an uninitialized variable or is an empty string. if [ “$stringvar1” == “cheese” ];...
sexit status. The exit status of a program is an integer which indicates whether the program was executed successfully or if an error occurred. The exit status of the last program run is stored in the question mark variable ($?). We can take a look at the exit status of the last ...
Regular expressions are shortened as ‘regexp' or ‘regex'. They are strings of characters that define a search pattern. It can be used as a search or search & replace operation. Expressions Explanation . Matches any single character. ? The preceding item is optional and will be matched, at...