Some useful commands for working in terminal Linux

Downloading a file using a link with the ability to continue downloading, for example, when the connection is broken:

wget -c http://link/file 

View recording in a text file in real time:

 tailf file 

Find out the command execution time:

 time command 

Tracking changes in the output of the command:

 watch command 

The key combination to close the current session in bash and various utilities, for example, the MySQL client:

 Ctrl-D 

Quick file backup:

 cp file{,.copy} 

File cleanup:

 > file 

Cleaning a file if you do not have rights to the file:

 echo -n | sudo tee file 

or

 sudo truncate -s 0 file 

Keyboard shortcut for searching through the history of previously entered commands:

 Ctrl-R 

Copy file with progress output:

 pv sourcefile > destfile 

Search for running processes without displaying the search process itself:

 ps aux | grep [p]rocess 

Create a directory and all subdirectories if they are missing:

 mkdir -p /path/to/directory 

Displaying pop-up messages on Gnome and Debian-based systems:

 notify-send "message!" 

It works similar to the cat command, with the difference that zcat is intended for packed files.

 zcat file 

Recursive search for files containing the search string:

 grep -lr string /directory 

Displays a list of libraries required for the program:

 ldd file