Few useful Linux commands

Just to let you know, that I mostly use Redhat.

Zipping a folder

$ tar czvf folder_name.tar.gz folder_name


Finding string in all files of folder

$ find . | xargs grep 'your string'


Removing files if rm -fR does not work

$ find . -name '*filename_pattern*' | xargs rm


Killing Linux process by name

$ kill `ps -ef | grep process_name_pattern | grep -v grep | awk '{print $2}'`


Linux command for find and replace

$ sed 's#FIND_STRING#REPLACE_STRING#g' File_Name > New_File_Name


Datetime update cron

Type crontab –e as su (super user) and paste following, replace your_datetime_server with IP or name of your server.

5 0 * * * /usr/sbin/ntpdate your_datetime_server > /dev/null 2>&1


Disk space usage in a folder

Change directory to your server and type

$ du -ks -h *


Find and remove files 14 days old

$ find /folder_name/ *file_name_pattern* -atime +14 -print | xargs rm