CLI

abcde – Text-mode CD ripper


aha – convert ANSI color to HTML

tldr ffmpeg | aha > ffmpeg.html


an

Anagram Generator

an -w -m 8 teresita

 

Print anagrams with a minimum of three characters using a local dictionary:

an -m 3 -d words.txt teresita

apg

Create a password with at least one symbol, one number, one uppercase letter and one lowercase letter (and if that doesn’t work try adding one incantation to Satan)

$ apg -M SNCL

^ogNifsec8
rivrag5Og:
Mav0Grag.
Ill8druv`
3}Wrepyels
.frevMeeg0


apt

List all installed software:

apt list –installed | cut -d”/” -f1 | uniq


cdw – Text-based console equivalent to popular Linux disk-burning software like Xfburn or Brasero. It is an Ncurses front-end for cdrecord/wodim, mkisofs/genisoimage, growisofs, dvd+rw-mediainfo, dvd+rw-format, xorriso, and mkudffs.

800px-Screenshot_2019-12-25_14-25-59

col

Read a man page in the terminal minus the “helpful” user interface

man genisoimage | col -b | less


column

Print comma-separated values as columnized data:

column starsc.csv -t -s “,”

 


concalc


cut

Select the first five fields of a file, using space as a delimiter

cat stars.txt | cut -d ‘ ‘ -f 1-5


ddir

Display directory tree:

ddir -d


dfc – View information on mounted devices


dict – command-line dictionary


dirsplit

Split a directory full of files into volumes small enough to burn to CD, while minimizing wasted space


dirsplit -m -s 650M loops

ditaa – convert ASCII art to graphical diagrams

ebook-convert

Convert ebooks from one format to another

ebook-convert ‘Rogue Planet – Greg Bear.azw3’ Rogue-Planet.epub

egrep

Frequency count of ending letters in words of 2 or more characters

for i in {a..z} ; do printf “$i ” ; look . | egrep “.$i$” | wc -l ; done | sort -k2nr

enchant

Print the words from Homer’s “Illiad” that don’t appear in the dictionary

enchant -l illiad.txt | sort | uniq

 


fc-list

List all installed fonts, names only

fc-list | sed ‘s/^[^ ]* //’ | sed ‘s/\:.*//’ | sort | uniq

find

List the shell scripts in your /usr/bin directory:

find /usr/bin -name “*” -exec file {} \; | grep “text executable” | sort


ffmpeg

Convert frames from a video or GIF into individual numbered images


ffmpeg -i bones-kirk.mp4 frame_%d.jpg

Extract frame 120 from a video to a jpg

ffmpeg -i trek.mp4 -vf “select=eq(n\,120)” -vframes 1 trek.jpg

 

Play Conway’s Game of Life


ffplay -f lavfi -i life=s=400×300:mold=10:r=30:ratio=0.1:death_color=#C83232:life_color=#00ff00,scale=1200:800:flags=32

 


file

Print information about the files in a directory:

find -name “*” -exec file {} \;

 


fmt

Simple optimal text formatter:

fmt gettysburg.txt

Burn data from the temp directory to CD with one command

genisoimage -r -joliet-long -o hold1.iso hold ; wodim -eject -tao speed=0 dev=/dev/sr0 -v -data hold1.iso

Scale and merge two GIFs:

  • gifsicle –resize 500×375 -i dewey.gif > huey.gif
  • gifsicle –colors 256 –merge huey.gif cylon.gif -o robots.gif

grep

Find non-text files

grep -iR -m 1 ” ” | grep “Binary file”

gs

Extract pages from a PDF file

gs -sDEVICE=pdfwrite -dNOPAUSE -dBATCH -dSAFER -dFirstPage=34 -dLastPage=34 -sOutputFile=test2.pdf The-Cambridge-Handbook-of-Physics-Formulas.pdf

history

Your top 25 commands

history | awk ‘{print $2}’ | sort | uniq -c | sort -n | tail -n25 | sort -nr

 


irssi – text mode IRC client


Print information about the files contained within an ISO file

isoinfo -l -i xp.iso


Convert an image to ASCII

jp2a ruby.jpg


links

text mode web browser


look

maim

Take a screenshot

maim –select snap1.png


Print a list of words that begin with string

$ look intra

intractability
intractability's
intractable
intramural
intranet
intranet's
intranets
intransigence
intransigence's
intransigent
intransigent's
intransigents
intransitive
intransitive's
intransitively
intransitives
intravenous
intravenous's
intravenouses
intravenously

lynx

Batch convert all HTML files in a directory to text files

#!/bin/bash

for i in *.html
    do lynx --dump "$i" > "${i%%.*}.txt"
    
done

 

madplay

Attenuate an MP3 by 3dB and write out to a WAV file:

madplay -a3 03-Fm-Delight.mp3 -o FM-Delight.wav

 

maim Take a screenshot maim –select snap1.png

make

Compile and install software old-school, from downloaded source code

tar -xvf joe-4.6.tar.gz 
cd joe-4.6
./configure 
make 
sudo make install

matrix

while :;do echo $LINES $COLUMNS $(( $RANDOM % $COLUMNS)) $(printf “\U$(($RANDOM % 500))”);sleep 0.05;done|gawk ‘{a[$3]=0;for (x in a){o=a[x];a[x]=a[x]+1;printf “\033[%s;%sH\033[2;32m%s”,o,x,$4;printf “\033[%s;%sH\033[1;37m%s\033[0;0H”,a[x],x,$4;if (a[x] >= $1){a[x]=0;} }}’

 



mc – Dual pane file manager

 

Midnight Commander has built-in FTP (File Transfer Protocol) support, which is good, because Firefox and Chrome kicked it to the curb.

mlr

Sort a large catalogue of stars in .csv format by name

mlr –icsv –opprint sort -f ProperName hygfull.csv

 

mogrify

Convert png files to jpg:

mogrify -format jpg *.png

 

montage

Tile images into a grid, automatically calculating the grid cell size from the largest image:

montage *.jpg -geometry +0 +0 result.jpg

most

The Unix tool called more lets you browse text files but you can’t go backwards so there’s another tool called less that has more options, on the theory that less is more. Now there’s still another tool called most that has even more features than less! I’m holding out for least.

ncduncurses disk usage

Interactive. See at a glance which directories have the most shit, which are empty, and the all symbolic links to other directories.

nl

Find and count all Bible verses too long to tweet

cat kjv.txt | awk ‘length > 280’ | nl

nl

Add line numbers to a file (5 digits, leading zeros, separated by a colon):

nl -i1 -s’: ‘ -nrz -w5 20211219.txt >20211219a.txt

 

oggenc

Use Vorbis Tools to convert a .WAV file to .ogg format

oggenc the-rhodes.violin.wav

oysttyer

Twitter from the terminal

Palindromic dates

#!/bin/bash
ispal() { date -d "$1" 1>/dev/null 2>&1 && echo "$1" ; }
for _H in {2..9}; do
 for _I in {0..9}; do
  for _J in {0..99}; do
   ispal ${_H}${_I}`printf "%02d%s" ${_J}`-`printf "%02d%s" ${_J} | rev`-`printf "%02d%s" ${_H}${_I} | rev`
  done
 done
done

pi

Compute 4000 digits of pi

pi 4000 pridecat

git clone https://github.com/lunasorcery/pridecat.git
cd pridecat
make && make install

ps

Find the processes which are your biggest memory hogs:

ps aux –sort=+\%mem | awk ‘{print $2,”\t”,$4,”%\t”,$11}’

Convert text data to sc spreadsheets

cat nearby.csv | psc -d, >nearby.sc

pstree

Display processes as a tree and do not truncate long lines

pstree -l

 

rig

Print contact information for ten imaginary people

rig -c 10

sc – text-based spreadsheets

setxkbmap

Avoid fat finger in #vim, turn the capslock key into a second escape key:

setxkbmap -option caps:escape


shuf

Print 30 random numbers in the range of 1-1000

shuf –head-count=30 –input-range=1-100


strings

Convert Wordstar-formatted files to text

strings -a -n 1 apollo.007 | sed -e :a -e ‘$!N;s/\n/ /;ta’ > apollo007.txt

Extract the plain text that exists inside compiled binaries (using the MS-DOS 7.1 commaAnd-line shell in this example)

strings command.com

TermFeed – RSS feed reader for the terminal, written in Python

tr

Build a list of all the words in a file:

tr ‘ ‘ \\n < gettysburg.txt | sort | uniq

 

tree

List contents of directories in a tree-like format

tree

 

units

The speed of light is 1,802,617,499,785.25 furlongs per fortnight.

unrar

Unpacking rar’d binaries pulled down from Usenet:

Issue unrar x against part01.rar

whatis

Get a one-line description for all the files in a directory, delete lines that have no description:

ls -l /usr/bin | awk ‘{print $9}’ | xargs whatis | sed ‘/appropriate/d’

wodim

Burn ISO to disk

wodim -eject -tao speed=0 dev=/dev/sr0 -v -data files1.iso


xargs

Calculate Easter for a range of years

$ seq 1990 2030 | xargs -i ncal -e {}
04/15/1990
03/31/1991
04/19/1992
04/11/1993
04/03/1994
04/16/1995
04/07/1996
03/30/1997
04/12/1998
04/04/1999
04/23/2000
04/15/2001
03/31/2002
04/20/2003
04/11/2004
03/27/2005
04/16/2006
04/08/2007
03/23/2008
04/12/2009
04/04/2010
04/24/2011
04/08/2012
03/31/2013
04/20/2014
04/05/2015
03/27/2016
04/16/2017
04/01/2018
04/21/2019
04/12/2020
04/04/2021
04/17/2022
04/09/2023
03/31/2024
04/20/2025
04/05/2026
03/28/2027
04/16/2028
04/01/2029
04/21/2030


xrandr

Print the current state of the display system:

xrandr –query