Install a list of packages from a text file.

cat packages.txt | xargs apt-get install

Different way to use the rename command.

rename 's/.html$/.php/' *.html

Use this command to move files from folders two level deep to the current folder…

mv */*.* .

Use this command to find all the links in the current directory…

find . -lname "*"

You can use locate to find files with name that matches a said regexp…

locate -i -r '\.jpg$'

Double space a file with Ruby using the command

ruby -pe 'puts' < file.txt

Show list of files provided by a rpm package installed

rpm -ql package_name

First show system events. Second command show events inherent to the process of booting kernel.

tail /var/log/messages
tail /var/log/dmesg

Use the DD command to create a 10 MB (10*1024*1024=10485760 bytes) size file named testfile_10MB

dd if=/dev/zero of=testfile_10MB bs=10485760 count=1

Original Article

Copy files/folder from a remote server to this system.

scp -r binnyva@192.168.0.100:/home/binnyva/folder_to_copy .