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 ...
$ ./check_substr.sh "This is a test string" "test string" "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...
/bin/bash # 方法一:直接赋值 array1=("value1" "value2" "value3") # 方法二:使用索引赋值 array2[0]="value1" array2[1]="value2" array2[2]="value3" # 方法三:从字符串分割赋值 string="value4 value5 value6" array3=($string) # 方法四:使用read命令赋值 echo "Enter values separated...
$ if [[ ${var} != ${var,,} ]]; then echo "The string contains uppercase letters." else echo "The string contains only lowercase letters." fi The string contains uppercase letters. Here, we compare${var}with${var,,}. The${var}variable holds the original string, while the${var,...
6. Check for input parameters and environment variables It is a good idea to validate the input parameters and to check if the necessary environment variables are properly set. If there are problems, display the reason for the problem and how to fix it, and terminate the script. ...
echo "Word $count ($i) contains $(echo -n $i | wc -c) characters" done上面例子中,cat ~/.bash_profile命令会输出~/.bash_profile文件的内容,然后通过遍历每一个词,计算该文件一共包含多少个词,以及每个词有多少个字符。in list的部分可以省略,这时list默认等于脚本的所有参数$@。但是,为了可读性,最...
STRING="HELLO WORLD!!!" echo $STRING 1. 2. 3. Your backup script and variables: #!/bin/bash OF=myhome_directory_$(date +%Y%m%d).tar.gz tar -czf $OF /home/linuxconfig 1. 2. 3. 3.1. Global vs. Local variables #!/bin/bash ...
-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 ...
Instead, to check if a bash array contains a value you will need to test the values in the array by using a bash conditional expression with the binary operator =~. The string to the right of the operator is considered a POSIX extended regular expression and matched accordingly. Be careful...