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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 05:04:30 208
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 19:48:43 127
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 17:52:30 252
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 00:41:12 361
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 17:10:53 151
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 13:35:52 532
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 18:03:03 241
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 17:07:02 334
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 03:49:03 211
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 16:11:00 296
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 21:17:27 160
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 1258
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 13:39:17 159
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 10:02:42 143
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 12:30:45 294
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 09:24:58 208
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 02:47:13 470
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 10:45:39 518
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 13:31:31 376

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 11:52:20 203

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 20:31:07 190
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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Advanced python tracing

Trace python statement execution and syscalls invoked during that simultaneously

Get info about remote host ports and OS detection

Where < target > may be a single IP, a hostname or a subnet -sS TCP SYN scanning (also known as half-open, or stealth scanning) -P0 option allows you to switch off ICMP pings. -sV option enables version detection -O flag attempt to identify the remote operating system Other option: -A option enables both OS fingerprinting and version detection -v use -v twice for more verbosity. $ nmap -sS -P0 -A -v < target >

drop first column of output by piping to this

View acceptable client certificate CA names asked for during SSL renegotiations

The key is to use the -prexit option at the command line, and then type "quit" instead of CTRL-C to exit OpenSSL. OpenSSL will then dump its last negotiated state, printing out the contents of the renegotiated handshake. Crucial for debugging client certificate configurations on web servers such as IIS, which renegotiate the SSL/TLS connection with the HTTP request in-flight to ask the client for a cert.

Find the package that installed a command

Tune your guitar from the command line.

This command, taken from play's manual page, plays a synthesized guitar tone for each of the strings on a standard tuned guitar. The command "play" is a part of the package "sox".

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Install a local RPM package from your desktop, then use the YUM repository to resolve its dependencies.

When downloading RPMs from the Internet, you don't have to 'rpm -i' or 'rpm -U' to install the package. Especially, if the package has dependencies. If you have YUM setup to access an RPM repository, this command will install the downloaded package, then any dependencies through YUM that it relies on. Very handy on RPM-based systems.

Recursive search inside the content of files under current directory - then view the result paginated with 'less'

This command will traverse all of the folders and subfolders under current working directory. For every file inside it, it will do a search inside the content of the file for a specific term 'what'. Then it will print a list of the lines that contain that term (and match that pattern). Each matching line will be preceded with the path and name to the file and then the line number iside taht file wehre the pattern was found. Then the actual content of the matching lien will be printed. The output will be piped throug less, so that the user can scroll through it if it goes beyond the limits of the current display window.

Retrofit a shebang to an existing script

Function to add a shebang to an existing script, handy if you forgot to add it in the first place.

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