public static boolean contains(String str, char searchChar) Checks if String contains a search character, handling null. This method uses String.indexOf(int). A null or empty ("") String will return false. StringUtils.contains(null, *) = false StringUtils.contains("", *) = false StringUtil...
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 ...
Use regex on a stringThe result of bash's regex matching can be used to replace sed for a large number of use-cases.CAVEAT: This is one of the few platform dependent bash features. bash will use whatever regex engine is installed on the user's system. Stick to POSIX regex features if...
char_name() # char_name # to call: char_name string # check if $1 does indeed contain only characters a-z,A-Z { # assign the argument across to new variable _LETTERS_ONLY=$1 _LETTERS_ONLY=`echo $1 | awk '{if($0~/[^a-zA-Z]/) print "1"}'` if [ "$_LETTERS_ONLY" !=...
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' ` # now cut out the last char rval=`echo -n "$1" | cut -b $numofchar` ...
string='My string'; if [[ $string == *My* ]] then echo "It's there!" fi If you prefer the regex approach: if [[ $string =~ .*My.* ]] Check if string contains certain elements : Colon Historically, Bourne shells did have neither true nor false as builtins. true was instea...
Native侧如何通过char指针构造ArrayBuffer数组 在CMakeLists文件中如何获取模块版本信息 传入自定义类型对象到Native侧时,index.d.ts文件如何声明 Native侧如何对ArkTS传递的Object类型的数据、属性进行修改 如何通过多个xxx.d.ts文件导出Native侧接口 如何在ArkTS侧监听Native侧日志信息 使用napi_run_script_path...
HOSTFILE Contains the name of a file in the same format as /etc/hosts that should be read when the shell needs to complete a hostname. The list of possible hostname completions may be changed while the shell is running; the next time hostname completion is attempted after the value is ...
charLength=$(expr length "$string") output=$(expr substr "$string" $start_index $charLength) echo "$output" OUTPUT 1 2 3 World! Here, we used the expr command. Note that we used nested expr, which means the inner expr would be evaluated first. So, we used the expr command wit...
Here, N is an integer where N >= 0. The output contains the last N commands from the history. We can also use the output in tandem with grep for filtering: $history|grep<string> To browse through a long history, we can use the “less” command: ...