using default value of $2, returns true if response starts with y or Y or is empty string local DEFAULT=yes if [ "$2" ]; then local DEFAULT="$( toLowerCase "$2" )"
ippart4=${inputip#*.} # check whether the ip number begins with zero, that is wrong syntax # if the string begins with zero, bash cannot convert it into integer correctly # ipart1 and ipart4 cannot be zero ifecho$ippart1|grep-q"^0"||echo$ippart4|grep-q"^0"; then return1 f...
function that takes a non-const string. */_rl_adjust_point ((char*)string, i, &ps);if((v = _rl_get_char_len ((char*)string+ i, &ps)) >1) { i += v -1;continue; } }#endif/* HANDLE_MULTIBYTE */if((!substring_okay && (whitespace (c) || c ==':'|| (history_search...
if [ ]; then ... elif [ ]; then ... else ... fi Test Constructs; 有示例,对于了解 bash 逻辑判断非常有帮助; In bash, how can I check if a string begins with some value? 检查$HOST 是否以 node 开头: case $HOST in node*) your code here esac ...
The following syntax is what to use to check and see if a string begins with a word or character. Note:The most recent versions of bash (v3+) support the regex comparison operator “=~”. To match this or that in a regex, use “|”. ...
Check if a pathname begins with “-” when accepting pathnames, if that's possible, and then prepend “./” if it does. Again, you should do this in any programming language, not just shell. Be careful about displaying or storing pathnames, since they can include newlines, tabs, termina...
An additional binary operator, =~, is available, with the same precedence as == and !=. When it is used, the string to the right of the operator is considered an extended regular expression and matched accordingly (as in regex(3)). The return value is 0 if the string matches the ...
If bash is started with the -c option, then $0 is set to the first argument after the string to be executed, if one is present. Oth erwise, it is set to the pathname used to invoke bash, as given by argument zero. _ Expands to the last argument to the previous com mand,...
2.3 String SubstitutionCheck some of the syntax on how to manipulate strings${variable#pattern} # if the pattern matches the beginning of the variable's value, delete the shortest part that matches and return the rest ${variable##pattern} # if the pattern matches the beginning of the ...
If pattern begins with %, it must match at the end of the expanded value of parameter. If string is null, matches of pattern are deleted and the / following pattern may be omitted. If parameter is @ or *, the substitution operation is applied to each positional parameter in turn, and ...