Misc¶

Paperkey¶

Export gpg key to a printable version

https://wiki.archlinux.org/index.php/Paperkey

Public Keys¶

GPG
SSH

Timezone¶

$ sudo timedatectl set-timezone America/Los_Angeles

Images¶

Imagemagick¶

# Ubuntu
$ sudo apt-get install sudo apt install imagemagick-6.q16hdri
# Convert image from ico to png
$ convert "favicon.ico" -thumbnail 16x16 -alpha on -background none -flatten "favicon.png"

Shred¶

Overwrite the data of file1.txt, file2.jpg, and file3.doc using the default shredding methods.

$ shred -u file1.txt file2.jpg file3.doc

Combine PDFs ¶

$ qpdf --empty --pages *.pdf -- out.pdf

List if a Package is Installed ¶

apt -qq list <package name>

Disk Free Space¶

df -h

List Hardware¶

sudo lshw -short

UID¶

id -u $(whoami)

GID¶

id -g $(whoami)

Screen ¶

Quit a session

screen -XS <session-id> quit

Check current session

echo $STY

Detached the previous screen and allowed me to reattach.

screen -d -r

Scroll upward in the terminal

C-a [

Replace Entire Line in File ¶

sed -i "s|^type     =.*$|type     = mysql|g" config.ini

keepachangelog ¶

Quit Screen Sessions¶

List screen ids

screen -list

Quit the session

screen -XS <session-id> quit

References¶

https://www.geeksforgeeks.org/shred-command-in-linux-with-examples/