Optimise Your Prompt
If you use a prompt which begins with a colon and ends with a semi-colon, you can cut and paste entire lines which requires much less eye-hand co-ordination.
Consider, if you will, setting a prompt like this:
$ export PS1=": $(hostname -s); " : chekalahk; ls file1 file2
As : is a builtin /bin/sh command which returns true ignoring its arguments, if you cut and paste the line:
: chekalahk; ls
Will evaluate into a NOOP and then the command that you typed in.
For root, you want to have a different prompt, generally one that contains a hash for some reason. The trick here is to make sure that you position the hash s.t.:
1. the hash is part of the preceding word, i.e. no spaces, and 2. the semi-colon comes after the hash.
: chekalahk#; ls file file file