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Summarize size of all files of given type in all subdirectories (in bytes)
This deals nicely with filenames containing special characters and can deal with more files than can fit on a commandline. It also avoids spawning du.

Create a mirror of a local folder, on a remote server
Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

Find all files under a certain directory /home that have a certain suffix at the end of the file name. Show the file and rename them to remove the suffix.

Reduce PDF size

convert strings toupper/tolower with tr

Allow any local (non-network) connection to running X server

restoring some data from a corrupted text file
man tac When there is a bad block in the middle of your file, you can see its begninning with `cat' and its end with `tac'. But both commands terminates with an error. So this sequence rebuilds a new file without badblock.

Copy a file from a remote server to your local box using on-the-fly compression
-P displays a progress meter -z tells rsync to use compression

Rename files in batch

Copy ssh keys to user@host to enable password-less ssh logins.
Same as original just no $ at start


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