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Run entire shell script as root

Placing sudo in the shebang line of a shell script runs the entire thing as root. Useful for scripts designed to, e.g. automate system upgrades or package manager wrappers — makes prepending everything with sudo no longer necessary
This is sample output - yours may be different.
18

#!/usr/bin/sudo /bin/bash

realkstrawn93 · 2021-04-27 05:04:30 209
Quickly ping range of IP adresses and return only those that are online
This is sample output - yours may be different.
2

nmap -sP 192.168.0.0/24

snaguber · 2021-04-25 19:48:43 128
Quickly ping range of IP adresses and return only those that are online

Tested in Debian, ymmv. - c 1 : send only one ping;; -W 1: wait for one second and then exit ping, assuming target IP is not available; change as needed (-W 0.5 for half a second, smaller or greater value depending on network speed/latency)
This is sample output - yours may be different.
2

{ for i in {1..254}; do ping -c 1 -W 1 192.168.1.$i & done } | grep "64 bytes"

test666v2 · 2021-04-25 17:52:30 253
Quick and dirty hardware summary

Quick and dirty hardware summary where lshw is not available. Requires util-linux, procps, pciutils, usbutils and net-tools, which should be preinstalled on most systems.
This is sample output - yours may be different.
3

alias gethw='(printf "\nCPU\n\n"; lscpu; printf "\nMEMORY\n\n"; free -h; printf "\nDISKS\n\n"; lsblk; printf "\nPCI\n\n"; lspci; printf "\nUSB\n\n"; lsusb; printf "\nNETWORK\n\n"; ifconfig) | less'

lordtoran · 2021-04-03 00:41:12 362
Percental CPU scaled load average

This “sysload” alias converts the load average to percentages and divides them by the number of CPUs/cores. It may provide a more intuitive guesstimate of how much work the server is doing. Show Sample Output
This is sample output - yours may be different.
```
$ sysload

System load (1m/5m/15m): 31,5% 30,0% 29,8%
```
0

alias sysload='printf "System load (1m/5m/15m): "; for l in 1 2 3 ; do printf "%.1f%s" "$(( $(cat /proc/loadavg | cut -f $l -d " ") * 100 / $(nproc) ))" "% "; done; printf "\n"'

lordtoran · 2021-03-27 17:10:53 152
Command to logout all the users in one command
This is sample output - yours may be different.
9

sudo who | awk '!/root/{ cmd="/sbin/pkill -KILL -u " $1; system(cmd)}'

tg0000 · 2021-02-03 13:35:52 533
rename anime fansubs

renames Anime Episodes to files, that can be parsed by sonarr & co Show Sample Output
This is sample output - yours may be different.
```
rename([subs4u]_Mushishi_S2_22_(hi10p,720p,ger.sub)[47B73AEB].mkv, Mushishi_S2_22.mkv)
```
4

rename -n 's/[_ ]?[\[$]([A-Z0-9-+,\.]+)[\]$][_ ]?//ig' '[subs4u]_Mushishi_S2_22_(hi10p,720p,ger.sub)[47B73AEB].mkv'

dbiesecke · 2021-02-02 18:03:03 242
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)
```
6

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 17:07:02 335
Code to check if a module is used in python code
This is sample output - yours may be different.
-1

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

shantanuo · 2021-01-17 03:49:03 212
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
```
2

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 16:11:00 297
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
```
1

openssl dgst -sha256 <FILENAME>

aysadk · 2020-12-20 21:17:27 161
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 1268
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 13:39:17 160
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 10:02:42 144
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.
```
 
```
4

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

aysadk · 2020-11-17 12:30:45 295
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 09:24:58 209
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.
9

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 02:47:13 471
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.
5

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

aysadk · 2020-11-04 10:45:39 519
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.
-3

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 13:31:31 377

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 11:52:20 204

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 []:YOURMAIL@MAIL
```
3

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 20:31:07 191
Update all Docker Images
This is sample output - yours may be different.
4

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

bakhru · 2020-10-21 21:44:36 187
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 --
```
1

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

Repie · 2020-09-23 12:33:50 185
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 17:19:09 329
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 09:10:02 203
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What's this?

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Find the 10 users that take up the most disk space

Start dd and show progress every X seconds

Adjust "sleep X" to your needs. *NOTE: First sleep is required because bash doesn't have a "post-test" syntax (do XXX while).

analyze traffic remotely over ssh w/ wireshark

When using tcpdump, specify -U option to prevent buffering.

Fill up disk space (for testing)

Put into some file. No special purpouse, just for fun...

Command for JOHN CONS

Would create a file with a meaningful title. Dedicated to John Cons, who is annoying us users. Merry Christmas!!!

Btrfs: Find file names with checksum errors

Btrfs reports the inode numbers of files with failed checksums. Use `find` to lookup the file names of those inodes. The files may need to be deleted and replaced with backups.

Getting Screen's Copy Buffer Into X's Copy Buffer (on Linux)

This command will let you just type c-a b (which means press 'ctrl' then 'a' then 'b'), and screen will save your copy buffer to /tmp/screen-exchange, and then execute xsel to copy the contents of that file into the system's X clipboard. 1. Install Conrad Parker's xsel from http://www.vergenet.net/~conrad/software/xsel/ 2. Add these lines to your .screenrc # Add cool line to make copying to x clipboard possible. # This binds C-a b to copy screen's copy buffer to the system clipboard. bind b eval writebuf 'exec /bin/sh -c "xsel -i -b < /tmp/screen-exchange"' 'exec /bin/sh -c "killall xsel"' 3. Restart screen. 4. Test it by typing c-a [ to enter copy mode. 5. Select some text using vi movement keys (h, j, k, l, etc...) and starting your selection by hitting the space bar, moving with vi movement keys, and then ending your selection with the space bar. 6. Type C-a b, and screen will use xsel to copy your screen copy buffer to the system's X clipboard buffer. 7. Then you can paste the screen copy buffer into any X program. Note: If you're using Mac OSX, you can use pbcopy instead of xsel. Also Note: The second exec in the .screenrc file, which runs killall on xsel, is necessary, because even when you redirect a file to xsel, xsel waits for you to press ctrl-c to kill it, and have it stop waiting for more input. Since xsel forces screen to wait, and I don't want to press ctrl-c, I send the equivalent of ctrl-c with killall causing xsel to write /tmp/screen-exchange to the X clipboard, and then exit. It's a hack, but it works. If you know how to get this to work without a lame hack leave a comment explaining how.

Print a row of 50 hyphens

Get there by going backwards and forgetting the numbers.

Find files containing string and open in vim

I often use "vim -p" to open in tabs rather than buffers.

Commit command to history file immedeately after execution

This could be added to .bashrc. Background: Linux usually saves history only on clean exit of shell. If shell ends unclean, history is lost. Also numerous terminals might confuse their history. With this variable set, history is immedeately written, accessible to all other open shells.

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