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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 17:15:24 581
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 12:10:37 446
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 09:56:40 470
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 14:49:57 419
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 22:43:08 385
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 05:27:12 378
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 03:00:09 393
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 11:32:47 395
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 17:58:32 334
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 11:52:18 385
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 06:48:06 362
Display disk partition sizes
This is sample output - yours may be different.
8

lsblk -o name,size

justsomeguy · 2022-03-04 04:29:47 377
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 19:53:02 508
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 08:52:13 369
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 10:17:49 323
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 19:25:14 338
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 07:20:09 450
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 16:57:35 567
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 02:56:53 406
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 16:14:24 371
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 18:03:36 355
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 08:10:32 409
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 08:08:40 373
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 13:31:04 233
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 06:22:14 323
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command line to optimize all table from a mysql database

Create a new file

Quickly build ulimit command from current values

It is helpful to know the current limits placed on your account, and using this shortcut is a quick way to figuring out which values to change for optimization or security. Alias is: $ alias ulimith="command ulimit -a|sed 's/^.*$[a-z]$)$.*$$/-\1\2/;s/^/ulimit /'|tr '\n' ' ';echo" Here's the result of this command: $ ulimit -c 0 -d unlimited -e 0 -f unlimited -i 155648 -l 32 -m unlimited -n 8192 -p 8 -q 819200 -r 0 -s 10240 -t unlimited -u unlimited -v unlimited -x unlimited $ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 155648 max locked memory (kbytes, -l) 32 max memory size (kbytes, -m) unlimited open files (-n) 8192 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 10240 cpu time (seconds, -t) unlimited max user processes (-u) unlimited virtual memory (kbytes, -v) unlimited file locks (-x) unlimited

give me back my sound card

for when a program is hogging the sound output. finds, and kills. add -9 to the end for wedged processes. add in 'grep ^program' after lsof to filter.

How to stop MAC Address via IPTables

edit the /etc/sysconfig/iptables file and try to work whit this: -A INPUT -i (interface) -m mac (mac address) -j ACCEPT/DROP

Find unused IPs on a given subnet

Rsync using SSH and outputing results to a text file

--delete will delete copies on remote to match local if deleted on local --stats will output the results -z zip -a archive -A preserve ACL -x don't cross filesystem boundaries -h human readable -e specify the remote shell to use

livehttpheaders (firefox addon) replacement

Default output-file is "liveh.txt". This uses only BRE, in case you're using an older version of sed(1) that doesn't have support for ERE added. With a modern sed(1), to reduce false positive matches, you might do something like: liveh(){ tcpdump -lnnAs512 -i ${1-} tcp |sed 's/.*GET /GET /;s/.*Host: /Host: /;s/.*POST /POST /;/GET |Host: |POST /!d;/[\"'"'"]/d;/\.\./d;w '"${2-liveh.txt}"'' >/dev/null ;} Anyway, it's easy to clean up the output file with sed(1) later.

Port Knocking!

Knock on ports to open a port to a service (ssh for example) and knock again to close the port. You have to install knockd. See example config file below. [options] logfile = /var/log/knockd.log [openSSH] sequence = 3000,4000,5000 seq_timeout = 5 command = /sbin/iptables -A INPUT -i eth0 -s %IP% -p tcp --dport 22 -j ACCEPT tcpflags = syn [closeSSH] sequence = 5000,4000,3000 seq_timeout = 5 command = /sbin/iptables -D INPUT -i eth0 -s %IP% -p tcp --dport 22 -j ACCEPT tcpflags = syn

Find failures with journalctl

Sometimes things break. You can find the most recent errors using a combination of journalctl, along with the classic tools sort and uniq

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