true if the String contains the search character, false if not or null string input 判断是否包含另外的子串 org.apache.commons.lang.StringUtils contains方法 写道 public static boolean contains(String str, String searchStr) Checks if String contains a search String, handling null. This method uses ...
In this article, we will see how to check if output contains String in Bash using grep, Conditional Expressions, awk, sed commands with various options. 2. Introduction to Problem Statement We will use ls -l to list directories and files in long format and search for .txt string in the ...
这很棒,因为它非常兼容.但是有一个错误:如果haystack字符串为空,它就不起作用.正确的版本是`string_contains(){[ - z"$ {2 ##*$ 1*}"] && [-n"$ 2"-o -z"$ 1"]; 最后的想法:空字符串是否包含空字符串?上面的版本是肯定的(因为`-o -z"$ 1"`部分). (5认同) +1.很好!对我来说,我...
#Take the main string read -p "Enter the main string value: " strValue #Check if the string contains any character from a to e or not if [[ $strValue =~ [a-e] ]]; then echo "The string contains characters from 'a' to 'e'" else echo "The string does not contain any charact...
valint() #@ USAGE: valint INTEGER case ${1#-} in ## Leading hyphen removed to accept negative numbers *[!0-9]*) false;; ## the string contains a non-digit character *) true ;; ## the whole number, and nothing but the number esac 如果函数体用括号括起来,那么它是在子 shell ...
如果if结构使用的不是test命令,而是普通命令,比如上一节的((...))算术运算,或者test命令与普通命令混用,那么可以使用 Bash 的命令控制操作符&&(AND)和||(OR),进行多个命令的逻辑运算。$ command1 && command2 $ command1 || command2对于&&操作符,先执行command1,只有command1执行成功后, 才会执行command2。
produces a result. The arithmetic operators that you’re already familiar with for addition (+), subtraction (-), and multiplication (*) work like you would expect them to. Notice that when doing multiplication you need to escape the star character, otherwise Bash thinks you’re trying to cr...
echo " $@ contains errors, it must contain only letters" } 1. 2. 3. 4. 5. 函数nameerror用于显示所有无效输入错误。使用特殊变量$@显示所有参数,这里为变量FNAME和SNAME值。完成脚本如下: #!/bin/sh # char_name() # char_name # to call: char_name string ...
# of the LINENO environment variable. It contains the current # line number. echo"Example of error with line number and message" error_exit"$LINENO: An error has occurred." 在bash脚本中有更好的错误处理例程吗? 相关讨论 请参阅这个详细的答案:在bash脚本中引发错误。
# remove the last character in string and return it in $rval if [ -z "$1" ]; then # empty string rval="" return fi # wc puts some space behind the output this is why we need sed: numofchar=`echo -n "$1" | wc -c | sed 's/ //g' ` ...