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Get an embedded Rust development environment set up without prompting

Rust kernel development needs a far different setup than most projects — so by passing these flags to rustup-init, you can ensure that you’ll have a Rust toolchain that will work on your system with little, if any, effort.
This is sample output - yours may be different.
0

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | bash -s -- --default-toolchain nightly --component rust-analyzer-preview --component llvm-tools-preview --component rust-src --component rustc-dev -y

realkstrawn93 · 2022-04-12 17:15:24 576
Have a smile

Outputs utf-8 smileys Show Sample Output
This is sample output - yours may be different.
```
????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
```
5

printf "$(awk 'BEGIN{c=127;while(c++<191){printf("\xf0\x9f\x98\\%s",sprintf("%o",c));}}')"

ichbins · 2022-04-06 12:10:37 438
Add temporary <1m entries to old cron

Old cron doesn't allow periods
This is sample output - yours may be different.
1

for i in $( seq 0 5 55 ); do (crontab -l ; echo "* * * * * sleep $i; date >> ~/log.txt") | crontab -; done

swarzynski · 2022-04-04 09:56:40 462
ASCII art of yourself

Use libcaca to render ascii chars on the webcam input... or don't.
This is sample output - yours may be different.
6

mplayer tv:// -vo caca

MarxBro · 2022-03-30 14:49:57 411
Print sensors data for your hardware
This is sample output - yours may be different.
4

paste <(cat /sys/class/thermal/thermal_zone*/type) <(cat /sys/class/thermal/thermal_zone*/temp) | column -s $'\t' -t | sed 's/$.$..$/.\1°C/'

wuseman1 · 2022-03-29 22:43:08 377
Print interface that is up and running
This is sample output - yours may be different.
2

ip addr | awk '/state UP/ {print $2}' | sed 's/.$//'

wuseman1 · 2022-03-29 05:27:12 376
HOME USE ONLY: Get rid of annoying Polkit password prompts

Although the need to type a password to make certain changes to the system may make perfect sense in a business or educational environment, it makes absolutely zero sense to the home user. So, if you’re at home and would rather get work done than be annoyed by what is essentially Linux’s UAC, then this command is for you.
This is sample output - yours may be different.
1

sudo find /usr/share/polkit-1 -iname “*.policy” -exec sed -i “s/$auth_admin\|auth_admin_keep$/yes/g” {} \;

realkstrawn93 · 2022-03-28 03:00:09 391
Quickly add a new user to all groups the default user is in

an alternative to this one with only 2 processes https://www.commandlinefu.com/commands/view/25844/quickly-add-a-new-user-to-all-groups-the-default-user-is-in
This is sample output - yours may be different.
0

awk -F: '/^.+user1/{print $1}' /etc/group | xargs -n1 sudo adduser user2

ichbins · 2022-03-18 11:32:47 394
Convert records in columns to csv
This is sample output - yours may be different.
2

awk '{print $3,$2,$1}' RS="\n\n" FS="\n" OFS="," filename.txt

swarzynski · 2022-03-08 17:58:32 333
Show tcp connections sorted by Host / Most connections
This is sample output - yours may be different.
11

netstat -ntu|awk '{print $5}'|cut -d: -f1 -s|sort|uniq -c|sort -nk1 -r

dbiesecke · 2022-03-08 11:52:18 383
Infinite loop ssh

This version won't reconnect if you exit the ssh connection with a non-zero exit code. ConnectTimeout and sleep values knobs for how long to wait for each retry.
This is sample output - yours may be different.
0

h=root@localhost ; while ! ssh -o ConnectTimeout=5 $h true; do sleep 5; done; ssh $h

justsomeguy · 2022-03-05 06:48:06 360
Display disk partition sizes
This is sample output - yours may be different.
8

lsblk -o name,size

justsomeguy · 2022-03-04 04:29:47 374
Developer: Add an IDT map design reference to your source tree

Kernel developers might need to know what indices to map to the IOAPIC if building a new kernel from scratch. This command gives users a guide to go off of.
This is sample output - yours may be different.
0

cp /proc/interrupts irq-ref.txt

realkstrawn93 · 2022-02-23 19:53:02 505
Recursive dwdiff using find -exec

Recursively compares files in directories DIR and OLD_FILES using dwdiff Word-by-word comparison with dwdiff results in words unique to NEW file versions in the DIR directory tree shown enclosed in [- SQUARE BRACKETS -] and words unique to OLD file versions in the OLD_FILES directory tree shown enclosed in {+ CURLY BRACES +} Note: does not detect files unique to the OLD_FILES directory tree. Show Sample Output
This is sample output - yours may be different.
```
Can't open file /OLD_FILES/new_file1: No such file or directory
Can't open file /OLD_FILES/new_file2: No such file or directory

dwdiff.txt contains output:
./DIR/file1
======================================================================
 [-NEW-] {+OLD+}
======================================================================

{+OLD+}
======================================================================
======================================================================
--EOF--
./DIR/file2
======================================================================
 [-NEW-] {+OLD+}
======================================================================
--EOF--
```
0

find DIR -exec sh -c "if [ -f \"{}\" ]; then echo {} >> dwdiff.txt; dwdiff --no-common {} /OLD_FILES/{} >> dwdiff.txt; echo \"--EOF--\" >> dwdiff.txt; fi" \;

RiskNerd · 2022-02-23 08:52:13 368
Shows picture exif GPS info if any and converts coords to a decimal degree number

This oneliner uses Imagemagic's identify utility to show the exif GPS information of an image an also converts Grad/MIn/Sec representation to a decimal degree number Show Sample Output
This is sample output - yours may be different.
```
    exif:GPSAltitude: 1665000/1000
    exif:GPSAltitudeRef: 0
    exif:GPSDateStamp: 2017:10:25
    exif:GPSInfo: 3166
    exif:GPSLatitude: 47/1, 39/1, 403802/10000  (47.661217)
    exif:GPSLatitudeRef: N
    exif:GPSLongitude: 11/1, 47/1, 374272/10000  (11.793730)
    exif:GPSLongitudeRef: E
    exif:GPSMapDatum: WGS-84
    exif:GPSProcessingMethod: ASCII
    exif:GPSTimeStamp: 10/1, 32/1, 53/1
    exif:GPSVersionID: 2, 2, 0, 0
```
5

identify -verbose my_image.jpg | awk 'function cf(i){split(i,a,"/");if(length(a)==2){return a[1]/a[2]}else{return a[1]}}/GPS/{if($1~/GPSLatitude:|GPSLongitude:/){s=$0;gsub(/,/,"",$0);printf("%s (%f)\n", s, $2+cf($3)/60+cf($4)/3600)}else{print}}'

ichbins · 2022-02-20 10:17:49 322
Enlarge KiCad PCB footprint pads to 2mm for all smaller pads
This is sample output - yours may be different.
0

sed -E -i.bak 's/(^ +$pad.*\(size)([^$]+)(\) $drill)([^$]+)(.*)/\1 2 2\3 1\5/g' SOURCE_FILE.kicad_pcb

alikhalil · 2022-02-12 19:25:14 336
Quickly add a new user to all groups the default user is in

This is a standard procedure for me, whenever I set up a new Raspberry Pi system. Because the default user is "pi", I quickly replace it with my own (e.g. "kostis"), but I have to substitute that user to all of pi's groups first, before deleting the default account. xargs helps a lot with that in a single line, while avoiding boring "for" loops. For everything trickier, there's always "parallel" :)
This is sample output - yours may be different.
3

groups pi | xargs -n 1 | tail -n +4 | xargs -n 1 sudo adduser kostis

kostis · 2022-01-25 07:20:09 449
Observing the difference between kernel configs after make config was executed to see if anything was changed from last kernel config (Gentoo)

Alternatively, the kernel provides a script to cleanly compare two config files even if the options have moved in the file itself: /usr/src/linux/scripts/diffconfig .config.old .config
This is sample output - yours may be different.
0

diff <(sort .config) <(sort .config.old) | awk '/^>.*(=|Linux)/ { $1=""; print }'

wuseman1 · 2022-01-24 16:57:35 565
Download entire website
This is sample output - yours may be different.
3

wget -r -p -U Mozilla --wait=10 --limit-rate=35K https://www.thegeekstuff.com

shantanuo · 2022-01-24 02:56:53 404
Shows a specific process memory usage
This is sample output - yours may be different.
1

mem() { ps -C "$1" -O rss | awk '{ count ++; sum += $2 }; END {count --; print "Number of processes:\t",count; print "Mem. usage per process:\t",sum/1024/count, "MB"; print "Total memory usage:\t", sum/1024, "MB" ;};'; }

mikhail · 2022-01-23 16:14:24 369
macOS: Save disk space by moving apps to external drives

Because Mac app bundles contain everything in one place, it makes running them from anywhere, including from a device such as a USB flash drive or external HDD, possible. So if your Mac has a mere 256GB of storage (as mine does), you can free up large quantities of disk space by storing apps like, say, Xcode on external devices.
This is sample output - yours may be different.
2

sudo mv /Applications/foo /Volumes/bar/Applications/foo && sudo ln -s /Volumes/bar/Applications/foo /Applications/foo

realkstrawn93 · 2022-01-20 18:03:36 353
Remove metadata from pdf file (e.g. creation date)
This is sample output - yours may be different.
0

qpdf --pages source.pdf 1-z -- --empty clean-file.pdf

swarzynski · 2022-01-12 08:10:32 407
Change dates/timestamps of all files in the current folder
This is sample output - yours may be different.
-1

gci -rec | %{ $_.lastWriteTime = ($_.lastAccessTime = ($_.creationTime = (get-date "2021-05-19T10:14:00"))) }

swarzynski · 2022-01-12 08:08:40 370
Display disk partition sizes

It is the same but more faster real 0m0,007s user 0m0,011s sys 0m0,000s with my solution real 0m0,038s user 0m0,044s sys 0m0,000s with your solution :) Show Sample Output
This is sample output - yours may be different.
```
NAME	SIZE
loop0	55,5M
loop1	55,5M
loop2	42,2M
loop3	43,3M
loop4	18,4M
loop5	61,9M
loop6	18,4M
loop7	61,9M
sda	55,9G
sdb	298,1G
sr0	1024M
```
3

lsblk | grep -v part | awk '{print $1 "\t" $4}'

gecco · 2022-01-11 13:31:04 232
Remove password from Bank Statement
This is sample output - yours may be different.
5

pdftk INPUT.PDF input_pw 0123456789 cat output OUTPUT.PDF

alikhalil · 2022-01-09 06:22:14 322
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grep -v with multiple patterns.

Use multiple patterns with grep -v. So you can print all lines in a file except those containing the multiple patterns you specify.

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)

Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

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"

Split a tarball into multiple parts

Create a tar file in multiple parts if it's to large for a single disk, your filesystem, etc. Rejoin later with `cat .tar.*|tar xf -`

Remove security limitations from PDF documents using ghostscript (for Windows)

#4345 also works under windows

Resize A Mounted EXT3 File System

Live extension of an ext3 file system on logical volume $v by 200GB without the need to unmount/remount. Requires that you have 1) a version of resize2fs that contains code merged from ext2online, and 2) kernel support for online resizing. (e.g. RHEL 5)

Sort files in folders alphabetically

Creates one letter folders in the current directory and moves files with corresponding initial in the folder.

Monitor a file with tail with timestamps added

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