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This command securely erases all the unused blocks on a partition.
The unused blocks are the "free space" on the partition.
Some of these blocks will contain data from previously deleted files.
You might want to use this if you are given access to an old computer and you do not know its provenance.
The command could be used while booted from a LiveCD to clear freespace space on old HD.
On modern Linux LiveCDs, the "ntfs-3g" system provides ReadWrite access to NTFS partitions thus enabling this method to also be used on Wind'ohs drives.
NB depending on the size of the partition, this command could take a while to complete.
I just found another use for the builtin ':' bash command. It increments counters for me in a loop if a certain condition is met...
: [arguments]
No effect; the command does nothing beyond expanding arguments and performing any specified redirections. A zero exit code is returned.
It helps you save a lot of writing :-)
Most people know that you can run a PHP script from the command line like so:
$php ./my_script.php
But sometimes I just want to run a quick bit of code, the PHP Command Line Interface allows me to do so with the -r option.
Requires package php5-cli
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"
I always add this to my .profile rc so I can do things like: "vim *.c" and the files are opened in tabs.
Gives you a list for all installed chrome (chromium) extensions with URL to the page of the extension.
With this you can easy add a new Bookmark folder called "extensions" add every URL to that folder, so it will be synced and you can access the names from every computer you are logged in.
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Only tested with chromium, for chrome you maybe have to change the find $PATH.
In this example, the docx gets converted to Open Document .odt format.
For other formats, you'll need to specify the correct filter (Hint: see "Comments" link below for a nice list).
Filter out lines of input that contain 72, or fewer, characters.
This uses bash only. ${#i} is the number of characters in variable i.