Contents
How do you get the last command line re displayed?
Following are the 4 different ways to repeat the last executed command.
- Use the up arrow to view the previous command and press enter to execute it.
- Type !! and press enter from the command line.
- Type !- 1 and press enter from the command line.
- Press Control+P will display the previous command, press enter to execute it.
How do you close a command prompt?
To close or exit the Windows command line window, also referred to as command or cmd mode or DOS mode, type exit and press Enter . The exit command can also be placed in a batch file. Alternatively, if the window is not fullscreen, you can click the X close button in the top-right corner of the window.
How to check if a command outputs an empty string?
Here’s an alternative approach that writes the std-out and std-err of some command a temporary file, and then checks to see if that file is empty. A benefit of this approach is that it captures both outputs, and does not use sub-shells or pipes.
How to check if a command succeeded or failed?
If you only need to know if the command succeeded or failed, don’t bother testing $?, just test the command directly. E.g.: And assigning the output to a variable doesn’t change the return value (well, unless it behaves differently when stdout isn’t a terminal of course).
How to test for a non-empty string in Bash?
You can test for a non-empty string in Bash like this: Note that I’ve used -A rather than -a, since it omits the symbolic current (.) and parent ( ..) directory entries. Note: As pointed out in the comments, command substitution doesn’t capture trailing newlines.
How to recover the last command character by character?
F1 will recover the last command character by character. Sometimes (if you didn’t press F9 & didn’t choose an older command and if you didn’t navigate through history using the keys F5 / F7 ), the following keys can work in cmd: A description for the functions above can be found on the Microsoft website.