StringUtils.contains(null, *) = false StringUtils.contains(*, null) = false StringUtils.contains("", "") = true StringUtils.contains("abc", "") = true StringUtils.contains("abc", "a") = true StringUtils.contains("abc", "z") = false Parameters: str - the String to check, may be ...
'This is a test string' contains 'test string' $ ./check_substr.sh 'This is a test string' 'is a test' 'This is a test string' contains 'is a test' $ ./check_substr.sh 'This is a test string' 'isa test' 'This is a test string' does not contain 'isa test' $ ./check_...
check_digits"$1" 即,用[0-9]*来表示匹配零个或多个连续的数字。 从字面上看像是可以匹配到全是数字的情况。 但实际上,它还是会匹配一个数字的情况。 只要有一个数字就会认为匹配,甚至还会匹配没有数字的情况。 具体的执行结果如下: $ ./checkdigits_fake.sh 12345 All digits. $ ./checkdigits_fake....
enum choices {a1, a2, b1, b2}; 方法一： public static boolean contains(String test) { f...
('x' "x" `ls` $'x' $"x") # $( not terminated by ) if contains unterminated string $('x) # ') # $("x) # ") # $(`x) # `) # $($'x) # ') # $($"x) # ") # # Multi-line $(ls | more) $( `x` "x" `ls` $'x' $"x" ) #end -- checks termination ...
-n is one of the supported bash string comparison operators used for checking null strings in a bash script. When -n operator is used, it returns true for every case, but that’s if the string contains characters. On the other hand, if the string is empty, it won’t return true. ...
Check if string contains a sub-stringUsing a test:if [[ $var == *sub_string* ]]; then printf '%s\n' "sub_string is in var." fi # Inverse (substring not in string). if [[ $var != *sub_string* ]]; then printf '%s\n' "sub_string is not in var." fi # This works ...
‘test’: Check file types and compare values man test(获取帮助) test的判断表达式分为4类 string integer expression file testexits with the status determined by EXPRESSION. Placing the EXPRESSION between square brackets ([and]) is the same as testing the EXPRESSION withtest. ...
/bin/bash # declare STRING variable STRING="Hello World" #print variable on a screen echo $STRING Navigate to a directory where your hello_world.sh is located and make the file executable: $ chmod +x hello_world.sh Now you are ready to execute your first bash script:...
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