Commands by bibe

Commands by bibe (5)

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Swap the two last arguments of the current command line

Say you just typed a long command like this: rsync -navupogz --delete /long/path/to/dir_a /very/long/path/to/dir_b but you really want to sync dir_b to dir_a. Instead of rewriting all the command line, just type followed by , and your command line will read rsync -navupogz --delete /very/long/path/to/dir_b /long/path/to/dir_a
This is sample output - yours may be different.
15

<ctrl+e> <esc+t>

bibe · 2012-03-11 07:49:09 19
Cleanup a (source) text file, removing trailing spaces/tabs and multiple consecutive blank lines

I used this command (in addition to a code formatting tool) to "cleanup" a bunch of PHP files
This is sample output - yours may be different.
1

sed -i -e 's/[ \t]*$//;/^$/N;/\n$/D' sourcefiletocleanup

bibe · 2012-02-10 11:09:54 5
Completly blank a disk

Instead of zeroing the filesystem, this command overwrites N times (default is 3) the disk content, making data recovery much harder. The command accepts many more options
This is sample output - yours may be different.
0

shred --iterations=N /dev/sdaX

bibe · 2012-01-23 20:40:36 9
Remove invalid key from the known_hosts file for the IP address of a host

Works for multiple hosts (such as www.google.com) and/or wrong hosts. Show Sample Output
This is sample output - yours may be different.
```
/home/USER/.ssh/known_hosts updated.
Original contents retained as /home/USER/.ssh/known_hosts.old
/home/USER/.ssh/known_hosts updated.
Original contents retained as /home/USER/.ssh/known_hosts.old
```
0

for HOSTTOREMOVE in $(dig +short host.domain.tld); do ssh-keygen -qR $HOSTTOREMOVE; done

bibe · 2012-01-19 15:57:10 5
Rank top 10 most frequently used commands

I make an extensive use of sudo, so I had to exclude the sudo part of the command history
This is sample output - yours may be different.
-2

history | sed -e 's/^sudo //' | awk '{print $2}' | sort | uniq -c | sort -rn | head

bibe · 2012-01-07 22:29:54 4

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Use acpi and notify-send to report current temperature every five minutes.

works best in a shell script run at startup. It will ping localhost once and output to null, after it does that, acpi is called for temperature in fahrenheit and piped through to another loop that feeds notify-send for a tooltip. After waiting five minutes, it will start over.

Show all detected mountable Drives/Partitions/BlockDevices

Yields entries in the form of "/dev/hda1" etc. Use this if you are on a new system and don't know how the storage hardware (ide, sata, scsi, usb - with ever changing descriptors) is connected and which partitions are available. Far better than using "fdisk -l" on guessed device descriptors.

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

Based on capsule8 agent examples, not rigorously tested

Join lines

This command turns a multi-line file into a single line joined with <SOMETEXT>. To skip blank lines, use: $ perl -pe '(eof()||s/^\s*$//)||s/\n//g' file.txt

Download Video & extract only a specific Time of it

Because this does not download more of the video than necessary, it is faster (especially with long videos).

Create a self-signed certificate for Apache Tomcat

Must be run as root. The 'tomcat' user must have access to the .keystore file. The key and keystore passwords must be the same. The password must be entered into the server.xml config file for Tomcat.

Fire CMD every time FILE (or directory) is updated (on *BSD)

Rename files in batch

Creates PodFeeds.txt, a file that lists the URLs of rhythmbox podcasts from the rhythmdb.xml file.

The first grep any line with pod-feed in it plus the following five lines. The second grep throws out any line not containing . sed removes the leading four spaces then and the trailing . Using a colon as sed's separating character avoids having to escape the /. Works ok with Mythbuntu 9.04 (used mostly as a three line bash script).

Maximum PNG compression with optipng, advpng, and advdef

optipng and advancecomp (for the the advpng and advdef tools) are the best FOSS tools for losslessly compressing PNGs. With the above tool chain, you can cut off as much as 20% off a PNG's file size.

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Commands by bibe (5)

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