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urldecode with AWK

Fast and simple awk urldecoder! Note: Parameter -n is specific to GNU awk Show Sample Output
This is sample output - yours may be different.
```
echo -e  "asdf%2Fxx%2Cx\n%2F%2Cxx"  | awk -niord '{printf RT?$0chr("0x"substr(RT,2)):$0}' RS=%..
asdf/xx,x
/,xx
```
2

awk -niord '{printf RT?$0chr("0x"substr(RT,2)):$0}' RS=%..

emphazer · 2023-03-30 15:05:58 319
Create a square thumbnail or favicon using ImageMagick

Resize `file.png` to a 32x32 px image. Use a value other than 32 to create other icon sizes (e.g. 16x16 or 32x32). Combine two favicon sizes using: `convert icon-16px.png icon-32px.png favicon.ico` For a social media preview image, use `2:1#` for the extent and `1200` for the scale.
This is sample output - yours may be different.
9

convert file.png -background transparent -gravity Center -extent 1:1# -scale 32 file-32px.png

lgarron · 2023-03-08 04:11:12 610
List all files in a folder in a git repository by last commit date

This lists all the files in a folder, then finds the commit date for them one by one, then sorts them from newest to oldest
This is sample output - yours may be different.
5

git ls-tree --name-only HEAD foldername/ | while read filename; do echo "$(git log -1 --format="%ci " -- $filename) $filename"; done | sort -r

fivestones · 2023-03-01 17:02:51 273
A Console-based Audio Visualizer for ALSA

# Installing apt search cava sudo apt install cava # modify the default config to change the colors by their hex color code cava -p mkdir ~/.cava nano ~/.cava/config cava # run with changes!
This is sample output - yours may be different.
3

cava

ioshield · 2023-02-28 19:53:42 365
Speak & Spell-esque glitch sounds

The Speak & Spell's sound chip uses a compressed audio format called "linear predictive coding". This command will read random bytes and attempt to decompress them as if it were audio data compressed in this format, then play it. This results in a unique sound which is similar to a glitching Speak & Spell.
This is sample output - yours may be different.
6

play -tlpc /dev/urandom

Sparkette · 2023-02-16 22:28:16 548
Bypass with hexencoding, dump /etc/passwd
This is sample output - yours may be different.
4

cat $(echo -e "\x2f\x65\x74\x63\x2f\x70\x61\x73\x73\x77\x64")

wuseman1 · 2023-01-14 06:43:27 1046
List all files and folders with attributes
This is sample output - yours may be different.
-3

gci -rec | Select-Object Mode, Name, CreationTime, LastAccessTime, LastWriteTime | ft -autosize

swarzynski · 2022-12-07 13:24:42 1475
Copy a file with progress and save hash to a different file
This is sample output - yours may be different.
4

pv file.txt | tee >(sha1sum > file.sha1) > file-copy.txt

bugmenot · 2022-11-24 20:23:02 1299
AWS s3api CLI can be used to filter objects in a S3 bucket based on the Last Modified Date using the --query filter.

as explained in the blog post: https://www.learnaws.org/2022/10/10/aws-s3-list-files-date/
This is sample output - yours may be different.
-2

aws s3api list-objects-v2 --bucket my-bucket --query 'Contents[?LastModified>`2022-01-01`].Key'

shantanuo · 2022-11-22 07:57:44 943
Unzip 25 zip files files at once
This is sample output - yours may be different.
3

find . -maxdepth 1 -name '*.zip' -print0 | xargs -0 -I {} -P 25 unzip {}

wuseman1 · 2022-11-20 14:07:44 457
Convert an image sequence into a video
This is sample output - yours may be different.
9

ffmpeg -framerate 30 -pattern_type glob -i '*.jpg' -c:v libx264 -pix_fmt yuv420p out.mp4

alikhalil · 2022-11-14 07:20:53 704
MySQL: Filter out specific tables from an existing mysqldump file with awk

This command works only if the line "DROP TABLE IF EXISTS" exists for all tables in the mysqldump file. It acts like a state machine.
This is sample output - yours may be different.
0

cat db_dump.sql | awk '/DROP TABLE IF EXISTS/ { skip = $5 ~ /table1|table2/ } !skip { print $0 }' > db_dump_filtered.sql

stf42 · 2022-10-30 16:58:57 801

How To Display Bash History Without Line Numbers

userful for direct copy & paste command for doumenation or next using Show Sample Output

history -w /dev/stdout

aysadk · 2022-10-29 15:17:37 891

merge multiple jpgs to one picture vertikal

# convert tool is from deb imagemagick-6.q16 apt install imagemagick-6.q16 Show Sample Output
This is sample output - yours may be different.
```
Output_merged_picture.jpg
```
3

convert picture-1.jpg picture-2.jpg picture-3.jpg -append Output_merged_picture.jpg

aysadk · 2022-10-25 15:34:48 538

Start monitoring your server with a single curl command.

activate the first alert and the next ones are activated automatically. Show Sample Output

curl ping.gl

wuseman1 · 2022-10-15 13:24:45 869

Show a zoomable world map

show a zoomable world map
This is sample output - yours may be different.
11

telnet mapscii.me

wuseman1 · 2022-10-15 13:15:17 529
List all packages in Ubuntu/Debian that no package depends on
This is sample output - yours may be different.
3

dpkg-query --show --showformat='${Package}\t${Status}\n' | tac | awk '/installed$/ {print $1}' | xargs apt-cache rdepends --installed | tac | awk '{ if (/^ /) ++deps; else if (!/:$/) { if (!deps) print; deps = 0 } }'

swarzynski · 2022-09-29 07:55:16 990
Print nic name of current connection
This is sample output - yours may be different.
2

nmcli -g name,type connection show --active|awk -F: '/ethernet|wireless/ { print $1 }'

wuseman1 · 2022-09-22 20:16:21 662
Simple tar

Simple commant to tar a path
This is sample output - yours may be different.
-2

tar -cvzf file.tar.gz path

x3mboy · 2022-09-17 16:40:09 850
rclone - dump teamdrive config to config file
This is sample output - yours may be different.
0

$ rclone backend -o your-config.conf drives mydrive:

dbiesecke · 2022-09-09 15:58:16 580
url redirect tracer with curl

tracing redirects for a given url shortener Show Sample Output
This is sample output - yours may be different.
```
Location: https://www.shorturl.at/dfIJQ
location: https://youtu.be/dQw4w9WgXcQ
location: https://www.youtube.com/watch?v=dQw4w9WgXcQ&feature=youtu.be
```
6

curl --silent -I -L shorturl.at/dfIJQ | grep -i location

aysadk · 2022-09-04 19:31:46 737
QEMU From Fedora Livecd + Device CD + Device Disk + UEFI + 800x600 forced

Entire command: sudo qemu-system-x86_64 -enable-kvm -cpu host -M q35 -m 2G -smp 4 --bios /usr/share/edk2/ovmf/OVMF_CODE.fd -drive id=cdrom,file=/dev/sr1,if=none,media=cdrom,format=raw,readonly=on -drive id=disk,file=/dev/md126,if=none,format=raw -device virtio-blk-pci,drive=cdrom -device virtio-blk-pci,drive=disk -device VGA,vgamem_mb=64,xres=800,yres=600
This is sample output - yours may be different.
-2

sudo qemu-system-x86_64 ...

pqatsi · 2022-09-02 20:07:02 502
Extend LVM and online resize filesystem

Default volume group in Ubuntu is ubuntu-vg and the logical volume is ubuntu-lv, so the provided command will resize the disk to utilize 100% of the available space. Show Sample Output
This is sample output - yours may be different.
```
  Size of logical volume ubuntu-vg/ubuntu-lv changed from <14.25 GiB (3647 extents) to <28.50 GiB (7295 extents).
  Logical volume ubuntu-vg/ubuntu-lv successfully resized.
resize2fs 1.45.5 (07-Jan-2020)
Filesystem at /dev/ubuntu-vg/ubuntu-lv is mounted on /; on-line resizing required
old_desc_blocks = 2, new_desc_blocks = 4
The filesystem on /dev/ubuntu-vg/ubuntu-lv is now 7470080 (4k) blocks long.
```
0

lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv && resize2fs /dev/ubuntu-vg/ubuntu-lv

sxiii · 2022-08-26 13:02:10 866
Clean or clean pacman and pamac cache
This is sample output - yours may be different.
0

sudo pacman -Scc && pamac clean -b

bugmenot · 2022-08-24 19:10:38 552
Sort disk usage from directories

Sort disk usage from directories in the current directory Show Sample Output
This is sample output - yours may be different.
```
4.0K    ./jenkins_home
8.0K    ./.docker
8.0K    ./.gnupg
8.0K    ./.oracle_jre_usage
12K     ./.local
28K     ./.config
36K     ./.ssh
40K     ./helm
140K    ./.ansible
2.7M    ./x3mboy
15M     ./.cache
15M     ./.kube
43M     ./.krew
3.7G    ./rancher
```
2

du --max-depth=1 -h . | sort -h

x3mboy · 2022-08-23 14:58:57 480
< 1 2 3 4 > Last ›

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Smart `cd`.. cd to the file directory if you try to cd to a file

This little function will smarten 'cd'. If you try to cd into a file (which I guess we all have done), it cd's into the directory of that file instead. I had to use nesten if's, to get cd to still work with 'cd' (to get to $HOME), 'cd -' (to get to last directory), and 'cd foo\ bar'.

Synchronize date and time with a server over ssh

using -u is better for standardizing date output and timezones, for servers in different timezones.

Grep syslog today last hour

Uses date to grep de logfile for today and uses it to get the last hour logs. Can be used to get last minute logs or today's logs.

Sum columns from CSV column $COL

More of the same but with more elaborate perl-fu :-)

run command on a group of nodes in parallel

Add a DNS server on the fly

Since systemd-resolved was implemented, add a DNS server have become weirder and harder than before. With this command, you can add a DNS server on-the-fly tied to an specific interface

list block devices

Shows all block devices in a tree with descruptions of what they are.

Create a self-signed certificate for Apache Tomcat

Must be run as root. The 'tomcat' user must have access to the .keystore file. The key and keystore passwords must be the same. The password must be entered into the server.xml config file for Tomcat.

Update grub menu.lst

Remove all commented lines Remove all blank lines Show the menu Up the delay so you have enough time to select a kernel Remove the quiet so you can watch the entire boot Add a rootdelay for san attached storage booting

find text in a file

this will find text in the directory you specify and give you line where it appears.

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