Verify the integrity and availability of resources
Display amount of free and used memory in the system:
free -h
Report virtual memory statistics:
vmstat 1 5
Report Central Processing Unit (CPU) statistics and input/output statistics for devices and partitions:
iostat 1 2
Display a periodically updated table of I/O usage:
sudo iotop
Collect, report and save system activity information in a binary file:
sar 2 5 -o report.file
Find which process lock a file:
less .vimrc
# put in background (ctrl+Z)
fuser .vimrc
.vimrc: 28135
or:
lsof | grep .vimrc
See currently used swap areas:
cat /proc/swaps
Examine filesystem capacity and usage:
df -hT
Find what is eating up disk space:
sudo du -x -d1 -h / | sort -h
Note: The flag -h makes
sortcommand to compare numbers in human readable format.
See if a piece of hardware is detected:
lspci
or:
lsusb
Find open ports on your machine:
sudo netstat -nlptu
Find laptop battery charge state and percentage:
upower -i $(upower -e | grep _BAT) | grep -P "(state|percentage)"