• Table of contents
• Bash tricks
  • Get disk usage
  • Get CPU and RAM usage
  • Start a Job without a queue

Bash tricks¶

Get disk usage¶

df -h

Will give you something like this:

Sys. de fichiers       Taille Utilisé Dispo Uti% Monté sur
/dev/sde1                110G    8,1G   97G   8% /
devtmpfs                 126G       0  126G   0% /dev
tmpfs                    126G       0  126G   0% /dev/shm
tmpfs                    126G    920K  126G   1% /run
tmpfs                    126G       0  126G   0% /sys/fs/cgroup
tmpfs                    126G    4,0K  126G   1% /tmp
/dev/mapper/ddf1_DATA2    15T    7,7G   14T   1% /home

Get CPU and RAM usage¶

htop

Will give you something like this:

To get more information about htop see here

Start a Job without a queue¶

All process started from ssh are terminated when you close the ssh connection, even if you fork them
(./app &). They are closed because when a process is closed the system send the SIGTERM signal
to all its children, it’s done to avoid zombies process on a machine. To keep your task alive when
you disconnect from ssh, you should use screen (tutorial), it will block the SIGTERM signal. To
start your application with screen:

screen # to start screen
./your_app   #to start your application or any other command
             #type ’ Ctrl-A’ d to leave screen with your application running in background

To reconnect to your previous session:

screen -ls    # to list running sessions
screen -r 33287.pts-36.bender # to reconnect to 33287.pts-36.bender session
exit # to close your screen session