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...
Check $var_to_test is not null 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 ...
char *ret; orig_line_number = line_number; --- 6858,6865 --- { WORD_LIST *wl, *rl; ! int tok, orig_line_number, assignok, ea, restore_pushed_strings; sh_parser_state_t ps; char *ret; + STRING_SAVER *ss; orig_line_number = line_number; *** *** 6879,6882 *** ---...
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...
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 ...
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 ...
string 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' ` # now cut out the last char rval=`echo -n "$1" | cut -b $numofchar`...
'. The second character is the quick substitu tion character, which is used as shorthand for re- running the previous command entered, substituting one string for another in the command. The default is `^'. The optional third character is the char acter which signifies that the ...
char | true true true true false false| true true true true false false hyphn| true true true true false false| true true true true false false two | -err- true -err- true -err- false| true true true true false false part | -err- true -err- true -err- false| true true ...
If/bin/shcompatibility is not a concern for you. ./testexe <<<"$a"$'\n'"$b" Solution 2: Make the following modifications to your C++ program and script: int main(int argc, const char*argv[]) { float a,b,c; a=std::stof(argv[1]); ...