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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
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[re]verify those burned CD's early and often - better safe than sorry -
at a bare minimum you need the good old `dd` and `md5sum` commands,
but why not throw in a super "user-friendly" progress gauge with the `pv` command -
adjust the ``-s'' "size" argument to your needs - 700 MB in this case,
and capture that checksum in a "test.md5" file with `tee` - just in-case for near-future reference.
*uber-bonus* ability - positively identify those unlabeled mystery discs -
for extra credit, what disc was used for this sample output?
simple find and exec example
Many like to use 'dd' for creating CD/DVD iso images. This is bad. Very bad. The reason this is, is 'dd' doesn't have any built-in error checking. So, you don't know if you got all the bits or not. As such, it is not the right tool for the job. Instead, 'reaom' (read optical media) from the wodim package is what you should be using. It has built-in error checking. Similarly, if you want to burn your newly creating ISO, stay away from 'dd', and use:
wodim -v -eject /path/to/image.iso
This command will delete files i a given path (/dir_name) , which older than given time in days (-mtime +5 will delete files older than five days.
This command will display all lines between 2 patterns: word-a and word-b
useful for grepping command outputs from file
This assumes you have the package installed necessary for converting WMF files. On my Ubuntu box, this is libwmf-bin. I used this command, as libwmf is not on my wife's iMac, so I archived the directories containing the WMF files from OS X, ran them on my Ubuntu box, archived the resulting SVGs, and sent them back to her. Quick, simple and to the point.
Searches directories recursively looking for extensions ignoring case. This is much more readable and clean than -exec for find. The while loop also gives further flexibility on complex logic. Also, although there is 'wmf2svg --auto', it expects lowercase extensions, and not uppercase. Because I want to ignore case, I need to use the -o option instead.
Works in ZSH and BASH. Haven't tested in other shells.
Converts a single FLAC file with associated cue file into multiple FLAC files.
Takes two arguments: the name of the FLAC file and and the name of the cue file.
Example: flacAlbumToFiles foo.flac foo.cue
This is a simple example of using proper command nesting using $() over ``. There are a number of advantages of $() over backticks. First, they can be easily nested without escapes:
program1 $(program2 $(program3 $(program4)))
program1 `program2 \`program3 \`program4\`\``
Second, they're easier to read, then trying to decipher the difference between the backtick and the singlequote: `'. The only drawback $() suffers from is lack of total portability. If your script must be portable to the archaic Bourne shell, or old versions of the C-shell or Korn shell, then backticks are appropriate, otherwise, we should all get into the habit of $(). Your future script maintainers will thank you for producing cleaner code.
Concatenate the stdout of multiple commands.
You also can sum the file usage of all files
find /usr/lib -maxdepth 1 -type l -print0 | xargs -r0 du -Lch
Suppose you made a backup of your hard disk with dd:
dd if=/dev/sda of=/mnt/disk/backup.img
This command enables you to mount a partition from inside this image, so you can access your files directly.
Substitute PARTITION=1 with the number of the partition you want to mount (returned from sfdisk -d yourfile.img).
First you have to create a directory in your system, where the fonts will be stored, and copy them.
sudo mkdir /usr/share/fonts/miscttf; sudo cp *.ttf /usr/share/fonts/miscttf
After recharge cache with the command
The large context number (-C 1000) is a bit of a hack, but in most of my use cases, it makes sure I'll see the whole log output.
This command is much quicker than the alternative of "sort | uniq -c | sort -n".