Linux tricks

These tricks are helps you to work in Linux. These commands need to type in console.

Convert video in gif:
mplayer input_file_name -nosound -vo gif89a:fps=15:output=output_file_name

If you work with remote server by SSH and communication often breaks, type after login:

screen -d -m
screen -S <session_name>
Then you can work. If you lose communication with server login and type:
screen -r <session_name>

If you want to delete files, that more than N bytes:

find /dir -size +N -exec rm \{\} \;

To delete files, that not changed more than N days:

find /dir -ctime +N -exec rm \{\} \;

Also find command has many other parameters.