[Linux] Some simple but useful commands

–> echo previous process id to file:

echo $! >> /path/to/pid-file/file.pid

–> Force reboot when reboot command does not work [this is a abrupt reboot and DOES NOT gracefully shutdown]:

echo 1 > /proc/sys/kernel/sysrq  // enable use of sysrq
echo b > /proc/sysrq-trigger     // reboot

–> List files/directories according to the datetime:

ls -lt

–> Check ram usage:

free -m

cat /proc/meminfo

–> Information of your Linux box:

uname -a  [shows you latest kernel version number and architecture (x86_64 or i386)]

cat /etc/redhat-release (redhat & centOS specific)

rpm -qa | grep kernel [check your kernel version]


About Dominic

J for JAVA more about me : http://about.me/dominicdsouza
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