• eval

    1 min read · basics

    Compose a statement for execution. 1x='echo $y' 2echo $x 3y=dragon 4eval "$x" The results remain in the current shell, unlike sub-shells. 1b=basilisk 2sh -c 'echo $b' 3eval "g=goblin" 4echo $g


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  • exiftool

    1 min read · metadata exifdata

    Find metadata: 1exiftool "$file".jpg Find info on all .png images in current directory. 1exiftool -ext .png . You can make this recurring with the -r switch. And overwrite all metadata: 1exiftool -all= -overwrite_original -ext jpg . (NB: This does not work on pdf data. See here for erasing all pdf data) Or just GPS …


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  • extrace

    1 min read · void

    Monitor all processes: 1extrace Monitor one process: 1extrace ls Monitor a script: 1./script.sh | extrace


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  • fail2ban for ssh

    1 min read · networking system Setup

    Requirements ssh SSH Daemon Jail 1sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.d/ssh.local [sshd] enabled = true ignoreip = 127.0.0.1/8 ::1,192.168.0.0/16 ::1 1sudo systemctl restart fail2ban 1sudo fail2ban-client status 1sudo fail2ban-client status sshd


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  • festival

    1 min read · sound

    Basics Add your user to the audio group, and install festival-english. 1echo "(Parameter.set 'Audio_Method 'Audio_Command)" >> /usr/share/festival/voices.scm 1echo "(Parameter.set 'Audio_Command "aplay -q -c 1 -t raw -f s16 -r $SR $FILE")" /usr/share/festival/voices.scm Set Default Voice Edit ~/.festivalrc with (set! …


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  • find and replace with confirmation

    1 min read · vim search replace find TUI

    Requirements vim basics Search for the next and or previous occurrence of the word under your cursor with * and #. Search and replace the first 'one' found with 'two': :%s/one/two/ Run the last substitution globally: g& Same, but just replace 'one' globally: :%s/one/two/g Put quotes around every occurrence of $HOME: …


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  • fonts

    1 min read · distros

    Basics Update font-cache: 1su root 2fc-cache List fonts: 1fc-list Grab the part of the font name you need for Xresources: 1fc-list | cut -d: -f2 Add field 3 for styles.


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  • Format a CSV file as markdown in vim

    1 min read · vim markdown csv

    The command to format CSV tables works similarly to formatting markdown. Put this in your ~/.vimrc and use Control + s after highlighting a cs 1vmap <C-s> :!column -ts, -o " | "<Enter>yyp:s/[^|:]/-/g<Enter> Read a CSV file into Vim: 1r ${file}.csv Select the csv output: 1Transaction Date,Transaction Type,Transaction …


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  • Format Markdown Columns in Vim

    1 min read · writing vim markdown TUI

    Got a wonky markdown table? 1 2| Real Time | Game Time | 3|:--|:-| 4| 1 week | 1 month | 5| 3 weeks | 3 months| 6| 6 months | 2 years| 7| 1 year | 4 years| Vim can fix it without plugins. Just use this snippet (type : to begin inputting a command): 1:vmap <C-t> :!tr -s ' -' |column -ts '|' -o '|'<Enter>j:s/ …


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  • fstab

    1 min read · system disk

    Basics The ordering of /etc/fstab is disk mount point filesystem type options dump pass Example: UUID=877f14e8-4738-46b0-884f-ba330dad1a7d /mnt/biggie ext4 nofail,rw,relatime 0 2 UUID=B21648C416488AF5 /mnt/share ntfs nofail,rw,nosuid,nodev,user_id=0,group_id=0,allow_other,blksize=4096 0 0 5: Dump Ignore this obsolete …


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