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Save a copy of all debian packages in the form in which they are installed and configured on your system

A copy of all installed debian packages on your system will be put back together, with all changes in configuration files you made and placed in the current directory. Make sure you have enough disk space (say 2-3 GB). Break any time with Ctrl+C. Show Sample Output
This is sample output - yours may be different.
```
$ ls -1
accountsservice_0.6.45-1ubuntu1.3_amd64.deb
acl_2.2.52-3build1_amd64.deb
acpid_2.0.28-1ubuntu1_amd64.deb
acpi-support_0.142_amd64.deb
...
^C
(Ctrl+C)
```
-1

for a in $(sudo dpkg --get-selections|cut -f1); do dpkg-repack $a|awk '{if (system("sleep .5 && exit 2") != 2) exit; print}';done

knoppix5 · 2021-01-17 17:07:02 6
Code to check if a module is used in python code
This is sample output - yours may be different.
0

find . -name "*.ipynb" -exec grep -l "symspellpy" {} \;

shantanuo · 2021-01-17 03:49:03 4
rename / move Uppercase filenames to lowercase filenames current directory

move filename/rename filenames with Uppercase to lowercase in current directory Show Sample Output
This is sample output - yours may be different.
```
 FileList=$(ls); for FName in $FileList; do LowerFName=$(echo "$FName" | tr '[:upper:]' '[:lower:]'); echo $FName" rename/move to $LowerFName"; mv $FName $LowerFName;  done
```
0

FileList=$(ls); for FName in $FileList; do LowerFName=$(echo "$FName" | tr '[:upper:]' '[:lower:]'); echo $FName" rename/move to $LowerFName"; mv $FName $LowerFName; done

aysadk · 2021-01-06 16:11:00 16
SHA256 signature sum check of file

get the SHA256 sum signatur for a file Show Sample Output
This is sample output - yours may be different.
```
SHA256(exampleFile-0.20.1-x86_64-linux-gnu.tar.gz)= 376194f06596ecfa40331167c39bc70c355f960280bd2a645fdbf18f66527397
```
0

openssl dgst -sha256 <FILENAME>

aysadk · 2020-12-20 21:17:27 18
From all PDF files in all subdirectories, extract two metadata fields (here: Creator and Producer) into a CSV table
This is sample output - yours may be different.
0

echo "File;Creator;Producer";find . -name '*.pdf' -print0 | while IFS= read -d $'\0' line;do echo -n "$line;";pdfinfo "$line"|perl -ne 'if(/^(Creator|Producer):\s*(.*)$/){print"$2";if ($1 eq "Producer"){exit}else{print";"}}';echo;done 2>/dev/null

langec · 2020-12-17 21:08:55 23
Cryptographically secure 32-bit RNG in strict ZSH

ZSH ships a couple random number generators via the $RANDOM environment variable and rand48() via zsh/mathfunc, but neither are cryptographically secure. This code produces a 32-bit random number suitable for cryptography. It's only dependency is /dev/urandom and it does not rely on any shell commands or 3rd party utilities. It assumes ZSH was compiled with 64-bit integer support. Show Sample Output
This is sample output - yours may be different.
```
1018359216
```
1

srandom() { zmodload zsh/system; local byte; local -i rnd=0; repeat 4; do sysread -s 1 byte || return; rnd=$(( rnd << 8 | #byte )); done < /dev/urandom; print -r -- $rnd; }

atoponce · 2020-12-17 13:39:17 20
Individually 7zip all files in current directory
This is sample output - yours may be different.
0

for i in *.*; do 7z a "$i".7z "$i"; done

Romero · 2020-12-07 10:02:42 18
Moving large number of files

if you want to move with command mv large list of files than you would get following error /bin/mv: Argument list too long alternavite with exec: find /source/directory -mindepth 1 -maxdepth 1 -name '*' -exec mv {} /target/directory \; Show Sample Output
This is sample output - yours may be different.
```
 
```
0

find /source/directory -mindepth 1 -maxdepth 1 -name '*' -print0 | xargs -0 mv -t /target/directory;

aysadk · 2020-11-17 12:30:45 33
Show contents of all git objects in a git repo

This script finds all git objects and `git cat-file`'s their content. This is really just a helper function to play around with the internals of git repositories. See https://git-scm.com/book/en/v2/Git-Internals-Git-Objects of more info. Show Sample Output
This is sample output - yours may be different.
```
$ mkdir test1; cd test1; git init
$ echo hello | git hash-object --stdin -w
ce013625030ba8dba906f756967f9e9ca394464a

$ cd ..; git clone test1 test2; cd test2

# now we run the command and notice
# the objects have been cloned
$ find .git/objects/ -type f \| sed 's/\.git\/objects\/\///' | sed 's/\///g' | xargs -n1 -I% echo echo "%" \$$git cat-file -p "%"$ \0 | xargs -n1 -0 sh -c
4b825dc642cb6eb9a060e54bf8d69288fbee4904
ce013625030ba8dba906f756967f9e9ca394464a hello
```
1

find .git/objects/ -type f \| sed 's/\.git\/objects\/\///' | sed 's/\///g' | xargs -n1 -I% echo echo "%" \$$git cat-file -p "%"$ \0 | xargs -n1 -0 sh -c

wires · 2020-11-15 09:24:58 29
Rename all subtitles files with the same name of mp4 files in same folder

Use this command if you want to rename all subtitles for them to have the same name as the mp4 files. NOTE: The order of "ls -1 *.mp4" must match the order of "ls -1 *.srt", run the command bellow to make sure the *.srt files will really match the movies after run this command: paste -d:
This is sample output - yours may be different.
5

paste -d: <(ls -1 *.mp4) <(ls -1 *.srt) | while read line; do movie="${line%%:*}"; subtitle="${line##*:}"; mv "${subtitle}" "${movie%.*}.srt"; done

ricardofunke · 2020-11-08 02:47:13 49
tree command limit depth for recusive directory list

sometimes I need list from path with max limit for recursive depth directory listing
This is sample output - yours may be different.
3

tree -L 2 -u -g -p -d

aysadk · 2020-11-04 10:45:39 27
mural graffiti

apt install toilet toilet-fonts # replace 'tput setaf 1' with 'tput setaf 9' to change color
This is sample output - yours may be different.
-2

tput setaf 1;tput rev;h=$(tput lines);w=$[$(tput cols)/6];c=$(seq -ws '_____|' $[$w+1]|tr -d "0-9");for a in $(seq $[$h/2]);do echo $c;echo ${c//|___/___|};done;tput cup 0;toilet -t -f bigmono12 "?LOVE";tput cup $h

knoppix5 · 2020-11-01 13:31:31 88

while dumping database if you see following error/warning than you have to repair broken tables/rows Show Sample Output

mysqlcheck --repair --all-databases -u root -p<PASSWORD>

aysadk · 2020-10-30 11:52:20 31

openssl Generate Self Signed SSL Certifcate

generating self signed ssl certificate to use in dovecot postfix nginx Self signed certificates can be used for private encryptions between server and client and must be manually accepted on browser/ client Show Sample Output
This is sample output - yours may be different.
```
-----
Country Name (2 letter code) [AU]:DE
State or Province Name (full name) [Some-State]:Berlin
Locality Name (eg, city) []:Berln
Organization Name (eg, company) [Internet Widgits Pty Ltd]:Berlin
Organizational Unit Name (eg, section) []:Berlin
Common Name (e.g. server FQDN or YOUR name) []:SUB.YOURDOMAIN.COM
Email Address []:[email protected]
```
1

openssl req -newkey rsa:2048 -nodes -keyout /etc/ssl/private/myblog.key -x509 -days 365 -out /etc/ssl/private/myblog.pem

aysadk · 2020-10-26 20:31:07 28
Update all Docker Images
This is sample output - yours may be different.
2

docker images --format "{{.Repository}}:{{.Tag}}" | grep ':latest' | xargs -L1 docker pull

bakhru · 2020-10-21 21:44:36 27
Exiftool adjust Date & Time of pictures

Change the original date set by camera : Create Date : 2020:08:21 13:26:24.63 //Operating System: Date Created (ie: sdcard) Date/Time Original : 2020:08:21 13:26:24.63 // Set by camrea when you point and click for photo Modify Date : 2020:08:21 13:26:24.63 //Operating System: Modified (ie: sdcard) Exif argument examples are : exiftool.exe “-DateTimeOriginal+=0:0:0 5:30:0” filename.jpg (add 5 hours and 30 minutes to the Exif Date/Time Original) exiftool.exe" "-modifydate-=0:0:0 0:25:0" filename.jpg (reduce the Exif Modify Date to 25 minutes) exiftool.exe “-AllDates+=Y:M:D h:m:s” filename.jpg (Change all exif date values to Y:M:D h:m:s) Show Sample Output
This is sample output - yours may be different.
```
>"exiftool(-k).exe" "-createdate-=0:0:0 0:25:0" .
    1 directories scanned
  862 image files updated
-- press ENTER --
```
0

"exiftool(-k).exe" "-DateTimeOriginal-=0:0:0 0:25:0" .

Repie · 2020-09-23 12:33:50 23
display information about the CPU
This is sample output - yours may be different.
5

lscpu | egrep 'Model name|Socket|Thread|NUMA|CPU$s$'

aysadk · 2020-09-19 17:19:09 75
Find non-ASCII and UTF-8 files in the current directory
This is sample output - yours may be different.
1

find . -type f -regex '.*\.$cpp\|h$' -exec file {} + | grep "UTF-8\|extended-ASCII"

swarzynski · 2020-09-15 09:10:02 36
Replace lines in files with only spaces/tabs with simple empty line (within current directory - recursive)
This is sample output - yours may be different.
0

find . -type f -regex '.*\.$cpp\|h$' -exec sed -i 's/^[[:blank:]]\+$//g' {} +

swarzynski · 2020-09-15 09:07:08 25
Find out how much ram memory has your video (graphic) card
This is sample output - yours may be different.
1

glxinfo |grep -i -o 'device|memory\|[0-9]\{1,12\} MB'|head -n 1

wuziduzi · 2020-09-14 02:12:47 38
find hard linked files (duplicate inodes) recursively

If you have two sets of files that may share hard-linked files, it can be useful to identify which ones are hard links to same underlying inode (file). This command shows you all of those, sorted by inode#. In my example the two directory trees to compare share a common parent, so I run the command in that parent and just use find . to start from the current directory. If yours are in different locations, you can pass both paths to find: find /directory1 /directory2 -type f -printf '%10i %p\n' | sort | uniq -w 11 -d -D | less Show Sample Output
This is sample output - yours may be different.
```
 190186228 ./10/alpha1/2612_fsm
 190186228 ./12/alpha1/base/19108/2612_fsm
 190203401 ./10/alpha1/pg_internal.init
 190203401 ./12/alpha1/base/19108/pg_internal.init
 190206322 ./10/alpha1/3079_fsm
 190206322 ./12/alpha1/base/19108/3079_fsm
```
0

find . -type f -printf '%10i %p\n' | sort | uniq -w 11 -d -D | less

dmmst19 · 2020-09-13 22:12:58 37
Find ASCII files and extract IP addresses
This is sample output - yours may be different.
0

find . -type f -exec grep -Iq . {} \; -exec grep -oE "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" {} /dev/null \;

wuziduzi · 2020-09-13 03:06:22 26
Find out how much ram memory has your video (graphic) card

One liner is based on this article: https://www.computerhope.com/issues/ch001307.htm Show Sample Output
This is sample output - yours may be different.
```
$ lspci|grep -i "VGA Compatible Controller"|cut -d' ' -f1|xargs lspci -v -s|grep ' prefetchable'
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
```
-3

lspci|grep -i "VGA Compatible Controller"|cut -d' ' -f1|xargs lspci -v -s|grep ' prefetchable'

knoppix5 · 2020-09-11 14:04:10 39
Show which line of a shell script is currently executed

This way you don't need to replace first line of a bash foo.sh script #!/bin/bash with #!/bin/bash -x to obtain the same effect
This is sample output - yours may be different.
-1

bash -x foo.sh

knoppix5 · 2020-09-10 19:56:42 27
Learn the difference between single and double quotes
This is sample output - yours may be different.
1

a=7; echo $a; echo "$a"; echo '$a'; echo "'$a'"; echo '"$a"'

knoppix5 · 2020-09-10 02:47:40 25
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Kill all processes belonging to a user

This is a 'killall' command equivalent where it is not available. Prior to executing it, set the environment variable USERNAME to the username, whose processes you want to kill or replace the username with the $USERNAME on the command above. Side effect: If any processes from other users, are running with a parameter of $USERNAME, they will be killed as well (assuming you are running this as root user) [-9] in square brackets at the end of the command is optional and strongly suggested to be your last resort. I do not like to use it as the killed process leaves a lot of mess behind.

Signals list by NUMBER and NAME

Pronounce an English word using Merriam-Webster.com

Looks up a word on merriam-webster.com, does a screen scrape for the FIRST audio pronunciation and plays it. USAGE: Put this one-liner into a shell script (e.g., ~/bin/pronounce) and run it from the command line giving it the word to say: $ pronounce lek If the word isn't found in merriam-webster, no audio is played and the script returns an error value. However, M-W is a fairly complete dictionary (better than howjsay.com which won't let you hear how to pronounce naughty words). ASSUMPTIONS: GNU's sed (which supports -r for extended regular expressions) and Linux's aplay. Aplay can be replaced by any program that can play .WAV files from stdin. KNOWN BUGS: only the FIRST pronunciation is played, which is problematic if you wanted a particular form (plural, adjectival, etc) of the word. For example, if you run this: $ pronounce onomatopoetic you'll hear a voice saying "onomatopoeia". Playing the correct form of the word is possible, but doing so might make the screen scraper even more fragile than it already is. (The slightest change to the format of m-w.com could break it).

Find Duplicate Files (based on size first, then MD5 hash)

Finds duplicates based on MD5 sum. Compares only files with the same size. Performance improvements on: $find -not -empty -type f -printf "%s\n" | sort -rn | uniq -d | xargs -I{} -n1 find -type f -size {}c -print0 | xargs -0 md5sum | sort | uniq -w32 --all-repeated=separate The new version takes around 3 seconds where the old version took around 17 minutes. The bottle neck in the old command was the second find. It searches for the files with the specified file size. The new version keeps the file path and size from the beginning.

Find out how old a web page is

I used to use the Firefox "View page info" feature a lot to determine how stale the web page I was looking at was. Now that I use mostly Chrome I miss that feature, so here is a command line alternative using wget. The -S says to display the server response, the --spider says to not download any files/pages, just fetch the header. The output goes to stderr, so to grep it you use 2>&1 to combine the stderr stream with stdout, the pipe that to grep for Last-Modified. You can use curl instead if you have it installed, like this: $ curl --head -s http://osswin.sourceforge.net | grep Mod

mplayer -af scaletempo

Pitch-correct play speed with mplayer. You can also use [] and {} keys to change play speed on-the-fly.

Split lossless audio (ape, flac, wav, wv) by cue file

Do you have an entire album in a unique file and want to split it in individual tracks? If you also have the cue file you can do it! Packages for Debian-based systems users: * cuetools shntool * FLAC (.flac): flac * WavPack (.wv): wavpack * Monkey's Audio (.ape): libmac2 monkeys-audio (deb http://www.debian-multimedia.org sid main) NOTE: "sid" packages are unstable, but I didn't have problems with them. If you prefer, use the "stable" version repository. To transfer the tags, you can use this (works with .flac, .ogg and .mp3): $ cuetag sample.cue split-track*.flac

I finally found out how to use notify-send with at or cron

The simplest way to do it. Works for me, at least. (Why are the variables being set?)

Copy/move a bunch of files to dot files and back

Get all links from commandlinefu front page

You need to install WWW::Mechanize Perl module with # cpan -i WWW::Mezchanize or by searching mechanize | grep perl in your package manager With this command, you can get forms, images, headers too

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