Note (in case you’re pretty new to bash/shell stuff): For the above command to work, you need to be in the same directory as package.json. That prints the entire file out for me in my terminal window. The easiest is cat which stands for concatenate but can be used to just print the contents of a file.įor example, I want to check something in the package.json file: cat package.json Let’s say I just want to view a file’s contents quickly. popd # now we're back to the directory we started in Quickly peek inside a file pushd allows you to navigate to a directory, do work there, and then popd back to where you were originally without having to remember the path back there (like cd.
You’re probably familiar with cd (change directory), but it can get cumbersome if you want to go to a folder, run a script, and come back to where you are. So I’ve compiled a list of commands or other things I’ve learned about bash that I’ve found consistently useful. I’m no expert in bash, but whenever I’ve invested time into learning more about it - whether it’s just a few commands or it’s syntax, it’s always paid off for me.
Plus, bash is available on every commonly used operating system now-it comes with macOS, most Linux distros, and now Windows via the new Linux sub-system stuff. For example, react, angular, and vue all have shell scripts in their repositories. I’ll be honest, bash can have some weird syntax, but I still think it’s a highly useful tool and very efficient way to automate tasks.
may create nested objects and/or arrays.Whether it’s just for npm install or some git commands, most everyone deals with bash sometime. will run until if finds a matching ']' char. The expectation is that the first character will be a '[' and it recursively by way of initValueFromStream() This is similar to initFromStream() above and may also be called "Invalid comma (no key/value pair following it)") (because if one doesn't, the parser will get screwed up and may not Check to see if another key/value pair really follows the comma "Invalid closing bracket while initializing object") following whitespace) to position us for the next key/value pair the start of the while loop) and a comma needs to be thrown out (along A bracket is an error, a brace means the object is done (and will be (If it was anything else, initValueFromStream() would have thrown an nextChar is guaranteed to be either a comma, close brace or close Istr > nextChar // > operator automatically skips white spaceĬheckChar(nextChar, ':') // the separator between the key and the value We expect to start the loop with the stream pointing to the opening quote Throw JSONParseException("Unexpected end of data stream") Unique_ptr ExpressionParser::parseSingleExpression(istream& input, ExpressionType lastExpression, Environment& environment) Return false // HTTP reason string too longĪCE_TEXT ("ACE_INet_HTTP: set_version(version) Return false // invalid HTTP status codeĬh = this->read_field (str, reason, MAX_REASON_LENGTH, '\r') Return false // invalid HTTP version stringĬh = this->read_ws_field (str, status, MAX_STATUS_LENGTH)
If (ch = eof_ || !ACE_OS::ace_isspace (ch)) While (ACE_OS::ace_isspace (str.peek ()))Ĭh = this->read_ws_field (str, version, MAX_VERSION_LENGTH)