i implementing shell using c++ coding language.
basically define char *argv[128] storing command strtok space.
so if input ls -a -l > test.txt turn
ls -a -l > test.txt what want separate '>' symbol can continue implement redirection , pipe function.
well want define vector store ls-a-l , test.txt , let program redirection function.
how can that?
you should define lexical conventions shell. instance in posix shells can pass argument space e.g. quoting or escaping backslash, in
ls > 'file name spaces' output of ls single file named file name spaces
if coding in c++, should use genuine c++ features. read line std::string using std::getline. should tokenize string, i.e. transform sequence of tokens. tokens special (so > not same quoted '>' etc...). define class token , implement parser gives std::vector<token> line (of type std::string) have read.
of course you'll need know syscalls, read e.g. advanced linux programming. instance, cd has shell builtin calls chdir(2). redirections need use dup2(2) , open(2). pipes need use pipe(2) etc....
btw, should source code of free software shells (and use strace find out do). coded in c (e.g. gnu bash, or sash), fish coded in c++.
