| Command |
Description |
|
# free -m |
displays status of RAM in megabytes [man] |
|
# kill -9 process_id |
force closure of the process and finish it [man] |
|
# kill -1 process_id |
force a process to reload configuration [man] |
|
# last reboot |
show history reboot [man] |
|
# lsmod |
display kernel loaded [man] |
|
# lsof -p process_id |
display a list of files opened by processes [man] |
|
# lsof /home/user1 |
displays a list of open files in a given path system [man] |
|
# ps -eafw |
displays linux tasks [man] |
|
# ps -e -o pid,args --forest |
displays linux tasks in a hierarchical mode [man] |
|
# pstree |
Shows a tree system processes [man] |
|
# smartctl -A /dev/hda |
monitoring reliability of a hard-disk through SMART [man] |
|
# smartctl -i /dev/hda |
check if SMART is active on a hard-disk [man] |
|
# strace -c ls >/dev/null |
display system calls made and received by a process [man] |
|
# strace -f -e open ls >/dev/null |
display library calls [man] |
|
# tail /var/log/dmesg |
show events inherent to the process of booting kernel [man] |
|
# tail /var/log/messages |
show system events [man] |
|
# top |
display linux tasks using most cpu [man] |
|
# watch -n1 'cat /proc/interrupts' |
display interrupts in real-time [man] |
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Monitoring and debugging 
