Shell Programming (ii)

The basic features of bash:

Command completion:

The shell program receives a request from the user to execute the command, and after the analysis is completed, the leftmost string is treated as a command;

Command Lookup mechanism:

Find internal commands;

According to the directory set in the PATH environment variable, the file name of the directory is searched from left to right;

The given beginning string, if it can uniquely identify a command program file, the direct completion;

Can not uniquely identify a command program file, and then click the TAB key once, will give a list;

Path Completion:

Under the given starting path, match each file under the starting path with the start string under the corresponding path:

tab

If it can be uniquely identified, then direct completion;

Otherwise, tab again, give the list;

Shell Programming (ii)