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Cool One-Liners

Here are some interesting one-line solutions for common linux/unix scripting problems:

1. Convert a dos file to a unix file:
        - 'tr -d '\r' < dosfile > unixfile'
2. Install opnssh server on ubuntu 7.04 (Feisty Fawn)
        - 'sudo apt-get install openssh-server'
3. expire a user's password so they must change it at the next logon
        - 'chage -d 0 <username>'
4. Delete a file type recursively
       -  'find . -type f -name "*.bak" -exec rm -f {} \;'
5. Clean up files in a directory. This will delete files in the '/your_directory that are older than 7 days.
       -  'find /your_directory -mtime +7 -exec rm {}\;'
6. This creates a file "/somedir/somefile" 3Gb in size
       -  'dd if=/dev/zero of=/somedir/somefile bs=1000k count=3000'