Commands by jeffskinnerbox

Commands by jeffskinnerbox (4)

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Total space used by open but deleted files

A potential source of a full filesystem are large files left open but have been deleted. On Linux, a file may be deleted (removed/unlinked) while a process has it open. When this happens, the file is essentially invisible to other processes, but it still takes on physical space on the drive. Tools like du will not see it.
This is sample output - yours may be different.
0

sudo lsof -nP | awk '/deleted/ { sum+=$8 } END { print sum }'

jeffskinnerbox · 2015-09-19 00:45:23 16
USE WITH CAUTION: perminately delete old kernel packages
This is sample output - yours may be different.
1

sudo apt-get remove --purge $(dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/$.*$-$[^0-9]\+$/\1/")"'/d;s/^[^ ]* [^ ]* $[^ ]*$.*/\1/;/[0-9]/!d')

jeffskinnerbox · 2015-09-19 00:41:36 13
List all the currently loaded old kernel packages, that is other than the active one
This is sample output - yours may be different.
0

dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/$.*$-$[^0-9]\+$/\1/")"'/d;s/^[^ ]* [^ ]* $[^ ]*$.*/\1/;/[0-9]/!d'

jeffskinnerbox · 2015-09-19 00:39:48 12
Kill the X Server

There are times when a X Window server hangs. When this happens, you can log in on a terminal and kill the Xorg process (i.e. the X Server). This one line command will do the trick.
This is sample output - yours may be different.
0

sudo kill -9 $( ps -e | grep Xorg | awk '{ print $1 }' )

jeffskinnerbox · 2014-06-01 22:43:32 8

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Optimal way of deleting huge numbers of files

Display HTTP-header using curl

Advanced python tracing

Trace python statement execution and syscalls invoked during that simultaneously

Transcode .flac to .wav with gstreamer

Takes all .flac directories, feeds them into a simple transcode pipeline to spit out .wavs with the same name (but correct extension).

Show drive names next to their full serial number (and disk info)

As of this writing, this requires a fairly recent version of util-linux, but is much simpler than the previous alternatives. Basically, lsblk gives a nice, human readable interface to all the blkid stuff. (Of course, I wouldn't recommend this if you're going to be parsing the output.) This command takes all the fun out of the previous nifty pipelines, but I felt I ought to at least mention it as an alternative since it is the most practical.

Show total disk space on all partitions

show off how big your disks are

Stop Flash from tracking everything you do.

Brute force way to block all LSO cookies on a Linux system with the non-free Flash browser plugin. Works just fine for my needs. Enjoy.

Stripping ^M at end of each line for files

just deletes to rogue CR from dos files, and tr is always available.

Detect illegal access to kernel space, potentially useful for Meltdown detection

Based on capsule8 agent examples, not rigorously tested

grab all of google IPv4 network blocks

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