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Print interface that is up and running
This is sample output - yours may be different.
1

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

wuseman1 · 2022-03-29 05:27:12 197
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_keep/yes/g;s/auth_admin/yes/g” {} \;

realkstrawn93 · 2022-03-28 03:00:09 200
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 11:32:47 245
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 17:58:32 177
Show tcp connections sorted by Host / Most connections
This is sample output - yours may be different.
10

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

dbiesecke · 2022-03-08 11:52:18 184
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 06:48:06 204
Display disk partition sizes
This is sample output - yours may be different.
7

lsblk -o name,size

justsomeguy · 2022-03-04 04:29:47 195
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.
1

cp /proc/interrupts irq-ref.txt

realkstrawn93 · 2022-02-23 19:53:02 230
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 08:52:13 203
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 10:17:49 188
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 19:25:14 204
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 07:20:09 277
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 16:57:35 315
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 02:56:53 189
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 16:14:24 223
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 18:03:36 214
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 08:10:32 247
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 08:08:40 221
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 13:31:04 129
Remove password from Bank Statement
This is sample output - yours may be different.
4

pdftk INPUT.PDF input_pw 0123456789 cat output OUTPUT.PDF

alikhalil · 2022-01-09 06:22:14 155
Extract content between the first " and the last " double quotes

Thanks to this user: https://stackoverflow.com/a/35636373/2394635 Show Sample Output
This is sample output - yours may be different.
```
checkin_resumestorevisit \"- "Online_V2.mt
```
1

s='Test "checkin_resumestorevisit \"- "Online_V2.mt" Run'; s=${s#*'"'}; s=${s%'"'*}; echo "$s"

bugmenot · 2022-01-08 16:16:18 212
Arch Linux: Always install software without asking

Adding this alias to ~/.bashrc or, better yet, the system-wide /etc/bash.bashrc (as in my setup) will make it possible to not only run pacman as any user without needing to prepend sudo but will also ensure that it always assumes that the user knows what he or she is doing. Not the best thing for large multi-user enterprise setups at all to say the least, but for home (desktop) use, this is a fantastic time-saver.
This is sample output - yours may be different.
3

alias pacman=‘sudo pacman --noconfirm’

realkstrawn93 · 2021-12-28 20:29:13 288
find packages installed from e.g. sid which are newer than those available from e.g. testing when sid is no longer present as a source repo

This is useful if you add sid, install some packages, then remove sid and want to work out which packages you installed from sid that should be removed (e.g. before an upgrade to the new stable). Alternatively you can think of this as "find installed packages that can no longer be installed."
This is sample output - yours may be different.
0

aptitude search -F '%p %v %V %O' '?narrow(?not(?archive("^[^n][^o].*$")),?version(CURRENT))' | while IFS=' ' read -r pkg ver candidate origin; do if [[ $ver == "$candidate" ]] && [[ $origin == '(installed locally)' ]]; then echo "$pkg"; fi; done

sorpigal · 2021-12-26 15:57:15 161
Display disk partition sizes

Use lsbk (list block) and jq (to manipulate a JSON on the command line) to display partition information: Show Sample Output
This is sample output - yours may be different.
```
["loop0","55.5M"]
["loop1","156M"]
["loop2","32.3M"]
["zram0","4G"]
["nvme0n1","476.9G"]
```
2

lsblk --json | jq -c '.blockdevices[]|[.name,.size]'

mikhail · 2021-12-22 22:31:07 146
Monitor memory without top or htop

It repeats a command, such as free, every five seconds and highlights the differences
This is sample output - yours may be different.
1

watch -n 5 -d '/bin/free -m'

mikhail · 2021-12-22 22:28:59 147
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What's this?

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Set a Reminder for yourself via the notification system

This will be seen through your system's visual notification system, notify-osd, notification-daemon, etc. --- sleep accepts s,m,h,d and floats (date; sleep .25m; date) --- notify-send (-t is in milliseconds && -u low / normal / critical) man notify-send for more information --- notification-daemon can use b/i/u/a HTML

Sort files in folders alphabetically

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

Merge *.pdf files

Merge all pdf files in the directory into one pdf file (the out.pdf file)

Redefine the cd command's behavior

Often, the very next command after the cd command is 'ls', so why not combine them?. Tested on a Red Hat derivative and Mac OS X Leopard Update: changed ${1:-$HOME} to "${@:-$HOME}" to accomodate directories with spaces in the names

Turns red the stderr output

Reference: http://stackoverflow.com/a/4455706

Netcat Relay

This is an example of using 3 hosts, in a netcat relay. first host connects to middle host 1 -> 2 Second hosts redirects to target host 1 -> 2 -> 3 I hope this makes sense.

Short URLs with is.gd

No curl and no sed, just wget :)

Find the package that installed a command

Get MD5 checksum from a pipe stream and do not alter it

Identify all amazon cloudformation scripts recursively using ripgrep

This assumes you are in the cwd of where you put your s3 scripts. Its useful if someone decides to create aws cloudformation scripts and doesn't add the 'yaml' or .yml extension.

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