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Boooted as EFI/UEFI or BIOS
This is sample output - yours may be different.
1

[[ -d "/sys/firmware/efi" ]] && echo "UEFI" || echo "BIOS"

wuziduzi · 2020-01-17 09:39:29 0
Print hugepage consumption of each process

The sample output is from an Android Device Show Sample Output
This is sample output - yours may be different.
```
/vendor/bin/hw/qcrild-c2 smaps:AnonHugePages:      2048 kB

/vendor/bin/imsdatadaemon smaps:AnonHugePages:      4096 kB

/vendor/bin/imsdatadaemon smaps:AnonHugePages:      2048 kB
```
0

grep -e AnonHugePages /proc/*/smaps | awk '{ if($2>4) print $0} ' | awk -F "/" '{system("cat /proc/" $3 "/cmdline");printf("\n");print $0; printf("\n");}'

praton · 2020-01-14 07:50:44 0
Print your cpu intel architecture family
This is sample output - yours may be different.
3

cat /sys/devices/cpu/caps/pmu_name

wuziduzi · 2020-01-01 04:57:27 0
Delete all local git branches that have been merged and deleted from remote
This is sample output - yours may be different.
-1

git branch -d $( git branch -vv | grep '\[[^:]\+: gone\]' | awk '{print $1}' | xargs )

gtron · 2019-12-22 15:48:54 1
Poor man's ntpdate
This is sample output - yours may be different.
3

date -s "$(curl -sD - www.example.com | grep '^Date:' | cut -d' ' -f3-6)Z"

casueps · 2019-12-20 10:10:14 1
Listen to a song from youtube with youtube-dl and mpv

Explanation Firstly the function checks if user gave it any input, and notifies the user if they failed to do so. If user has inputed a search string, the function will call upon youtube-dl to find url of the audio of the first matching youtube video and play that with mpv. Call function by wrapping search string in quotes: listen-to-yt "sultans of swing" You have to paste the line in your .zshrc and source .zshrc for it to work. Limitations The dependancies are youtube-dl and mpv. this oneliner is stolen from http://www.bashoneliners.com/oneliners/302/
This is sample output - yours may be different.
1

listen-to-yt() { if [[ -z "$1" ]]; then echo "Enter a search string!"; else mpv "$(youtube-dl --default-search 'ytsearch1:' \"$1\" --get-url | tail -1)"; fi }

emphazer · 2019-12-18 14:22:12 1
get all Google ipv4/6 subnets for a iptables firewall for example (updated version)

google has added 2 more netblocks... Show Sample Output
This is sample output - yours may be different.
```
108.177.8.0/21
108.177.96.0/19
130.211.0.0/22
172.217.0.0/19
172.217.128.0/19
172.217.160.0/20
172.217.192.0/19
172.217.32.0/20
172.253.112.0/20
172.253.56.0/21
173.194.0.0/16
2001:4860:4000::/36
209.85.128.0/17
216.239.32.0/19
216.58.192.0/19
2404:6800:4000::/36
2607:f8b0:4000::/36
2800:3f0:4000::/36
2a00:1450:4000::/36
2c0f:fb50:4000::/36
35.190.247.0/24
35.191.0.0/16
64.233.160.0/19
66.102.0.0/20
66.249.80.0/20
72.14.192.0/18
74.125.0.0/16
```
4

for NETBLOCK in $(echo _netblocks.google.com _netblocks2.google.com _netblocks3.google.com); do nslookup -q=TXT $NETBLOCK ; done | tr " " "\n" | grep ^ip[46]: | cut -d: -f2- | sort

emphazer · 2019-12-16 07:09:12 1

Get all upgradable deb packages in a single line

Works for debian and ubuntu based distros. Show Sample Output

apt list --upgradable | grep -v 'Listing...' | cut -d/ -f1 | tr '\r\n' ' ' | sed '$s/ $/\n/'

bugmenot · 2019-12-13 16:16:19 2

VI/VIM Anonymize email address in log file

The number 5 means to replace the leading and trailing 5 characters of an "@" in a log file with XXXX@XXXXX.
This is sample output - yours may be different.
-2

%s/.\{5\}@.\{5\}/XXXXX@XXXXXX/g

dasmna · 2019-12-12 15:37:17 0
Print all git repos from a user (only curl and grep)
This is sample output - yours may be different.
2

curl -s https://api.github.com/users/<username>/repos?per_page=1000 | grep -oP '(?<="git_url": ").*(?="\,)'

acavagni · 2019-12-11 20:55:13 2
Show all current listening programs by port and pid with SS instead of netstat
This is sample output - yours may be different.
4

ss -plunt

symgryph · 2019-12-09 17:44:55 1
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. Show Sample Output
This is sample output - yours may be different.
```
2019-12-05/1264/123123123/StackSet-MyCoolScriptlimitCheckStack-P9PAO5WIAKQA
2019-12-05/1264/23123231123/ServiceUsageLimitMonitor-20181121-limitMySadness
```
1

rg -l "AWSTemplateFormatVersion: '2010-09-09'" *

symgryph · 2019-12-09 17:43:10 1
Print all git repos from a user

Python is installed on many boxes (in case you could not afford installing jq).
This is sample output - yours may be different.
0

curl -s "https://api.github.com/users/<username>/repos?per_page=1000" | python <(echo "import json,sys;v=json.load(sys.stdin);for i in v:; print(i['git_url']);" | tr ';' '\n')

grault · 2019-12-07 10:49:58 0
Print all git repos from a user

in case you could afford installing jq
This is sample output - yours may be different.
1

curl -s "https://api.github.com/users/<username>/repos?per_page=1000" | jq '.[].git_url'

grault · 2019-12-07 10:48:32 1
Convert CSV to JSON with miller

Using the csv tool `miller` you can transform a csv file into a json array of objects, where the properties are the values of the csv header line and the values are the values of the subsequent lines. Show Sample Output
This is sample output - yours may be different.
```
[
 { "H1": "a1", "H2": "a2", "H3": "a3" },
 { "H1": "b1", "H2": "b2", "H3": "b3" },
 { "H1": "c1", "H2": "c2", "H3": "c3" }
]
```
1

mlr --c2j --jlistwrap cat file.csv

pepa65 · 2019-12-06 07:16:58 0
Show top 50 running processes ordered by highest memory/cpu usage refreshing every 1s

http://alvinalexander.com/linux/unix-linux-process-memory-sort-ps-command-cpu for an overview of --sort available values
This is sample output - yours may be different.
4

watch -n1 "ps aux --sort=-%mem,-%cpu | head -n 50"

jgleeson · 2019-12-03 20:51:03 1

grep for minus (-) sign

Use flag "--" to stop switch parsing Show Sample Output

grep -- -

knoppix5 · 2019-11-29 23:45:06 0

Print all git repos from a user
This is sample output - yours may be different.
13

curl -s https://api.github.com/users/<username>/repos?per_page=1000 |grep git_url |awk '{print $2}'| sed 's/"$.*$",/\1/'

wuziduzi · 2019-11-19 20:31:19 1
create a nicely formatted example of a shell command and its output

Shell function which takes a bash command as its input, and displays the following formatted output: EXAMPLE: command OUTPUT: output from command Show Sample Output
This is sample output - yours may be different.
```
EXAMPLE:

    example ls -l

OUTPUT:

    EXAMPLE:
    
        ls -l
    
    OUTPUT:
    
        total 0
        -rw-rw-r-- 1 bartonc bartonc 0 Nov 10 13:58 a
        -rw-rw-r-- 1 bartonc bartonc 0 Nov 10 13:58 b
        -rw-rw-r-- 1 bartonc bartonc 0 Nov 10 13:58 c
```
8

example() { echo "EXAMPLE:"; echo; echo " $@"; echo; echo "OUTPUT:"; echo ; eval "$@" | sed 's/^/ /'; }

bartonski · 2019-11-10 19:08:23 1
Host cpu performance

Measure the cpu performance: In-case if the cpu is thermal throttling then you can find it using this command. Check the first line of the output. Example: Doing md5 for 3s on 16 size blocks: 11406892 md5's in 2.98s ? #(When cpu is not throttling) Doing md5 for 3s on 16 size blocks: 110692 md5's in 2.98s ?? #(When cpu is thermal throttling) Practical use case: Once we had cooling outage in data center which caused thermal throttling in some of the worker nodes. We used this tool to prove that some servers are not performing well because of the cpu thermal throttling. Show Sample Output
This is sample output - yours may be different.
```
Doing md5 for 3s on 16 size blocks: 11406892 md5's in 2.98s
Doing md5 for 3s on 64 size blocks: 8479926 md5's in 2.99s
Doing md5 for 3s on 256 size blocks: 4800618 md5's in 2.99s
Doing md5 for 3s on 1024 size blocks: 1719000 md5's in 2.98s
Doing md5 for 3s on 8192 size blocks: 249448 md5's in 2.99s
```
10

openssl speed md5

kharthigeyan · 2019-11-07 16:30:30 3
Make window transparent (50% opacity) in Gnome shell

Click window to change its opacity. Source: https://unix.stackexchange.com/a/494289
This is sample output - yours may be different.
1

xprop -format _NET_WM_WINDOW_OPACITY 32c -set _NET_WM_WINDOW_OPACITY 0x7FFFFFFF

yoyoyojomo · 2019-10-31 20:44:21 0
Set RGB gamma of secondary monitor

This command first determines whether a second screen is connected. If this is the case, it sets the screen's RGB gamma via xrandr. Useful for cheap or slightly defective monitors with a tint. In this example a yellowing/champagne color deviation is compensated for by decreasing the red and the green portion of the image.
This is sample output - yours may be different.
1

secondscreen=$(xrandr -q | grep " connected" | sed -n '2 p' | cut -f 1 -d ' '); [ "$secondscreen" ] && xrandr --output $secondscreen --gamma 0.6:0.75:1

lordtoran · 2019-10-28 13:12:08 0
Massive change of file extension (bash)

Change the file extension in batch. Useful to create output file names with same input name but distinct extension by including logic inside the loop
This is sample output - yours may be different.
3

for file in *.txt; do mv "$file" "${file%.txt}.xml"; done

neomefistox · 2019-10-24 04:35:10 0
Find dupe files by checking md5sum
This is sample output - yours may be different.
5

find /glftpd/site/archive -type f|grep '([0-9]\{1,9\})\.[^.]\+$'|parallel -n1 -j200% md5sum ::: |awk 'x[$1]++ { print $2 " :::"}'|sed 's/^/Dupe: /g'|sed 's,Dupe,\x1B[31m&\x1B[0m,'

wuziduzi · 2019-10-22 16:02:15 1
Countdown Clock

I find the other timers are inaccurate. It takes some microseconds to perform the date function. Therefore, using date/time math to calculate the time for us results in millisecond accuracy. This is tailored to the BusyBox date function. May need to change things around for GNU date function. Show Sample Output
This is sample output - yours may be different.
```
00:03:00
```
-1

let T=$(date +%s)+3*60;while [ $(date +%s) -le $T ]; do let i=$T-$(date +%s); echo -ne "\r$(date -d"0:0:$i" +%H:%M:%S)"; sleep 0.3; done

davidk · 2019-10-22 15:04:21 1
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See why a program can't seem to access a file

Sometimes a program refuses to read a file and you're not sure why. You may have display_errors turned off for PHP or something. In this example, fopen('/var/www/test/foo.txt') was called but doesn't have read access to foo.txt. Strace can tell you what went wrong. E.g., if php doesn't have read access to the file, strace will say "EACCESS (Permission denied)". Or, if the file path you gave doesn't exist, strace will say "ENOENT (No such file or directory)", etc. This works for any program you can run from the command-line, e.g., strace python myapp.py -e open,access... Note: the above command uses php-cli, not mod_php, which is a different SAPI with diff configs, etc.

Find all dotfiles and dirs

find makes it easier, filtering . and .. maxdepth could be removed, finding entries recursively. Removing mindepth causes . to appear

Display Spinner while waiting for some process to finish

alternatively, run the spinner for 5 seconds: timeout 5 bash -c 'spinner=( Ooooo oOooo ooOoo oooOo ooooO oooOo ooOoo oOooo); while true; do for i in ${spinner[@]}; do for j in seq 0 ${#i}; do echo -en "\b\b"; done; echo -ne "${i}"; sleep 0.2; done; done'

Replace Solaris vmstat numbers with human readable format

% cat ph-vmstat.awk # Return human readable numbers function hrnum(a) { b = a ; if (a > 1000000) { b = sprintf("%2.2fM", a/1000000) ; } else if (a > 1000) { b = sprintf("%2.2fK", a/1000) ; } return(b) ; } # Return human readable storage function hrstorage(a) { b = a ; if (a > 1024000) { b = sprintf("%2.2fG", a/1024/1024) ; } else if (a > 1024) { b = sprintf("%2.2fM", a/1024) ; } return(b) ; } OFS=" " ; $1 !~ /[0-9].*/ {print} $1 ~ /[0-9].*/ { $4 = hrstorage($4) ; $5 = hrstorage($5) ; $9 = hrnum($9) ; $10 = hrnum($10) ; $17 = hrnum($17) ; $18 = hrnum($18) ; $19 = hrnum($19) ; print ; }

Create a tar of directory structure only

The original suggestion did not work for me, when operating on folders located on an external mount (ie other than the root device) in Ubuntu. A variation using xargs does the trick.

sleep until X o'clock

pauses exactly long enough to wake at the top of the hour

Scan for nearby Bluetooth devices.

Scans local area for visible Bluetooth devices. Use 'hcitool inq' to discover the type of device it is. And use -i hciX option to specify the local Bluetooth device to use.

Jump up to any directory above the current one

Usage: upto directory

Watch TCP, UDP open ports in real time with socket summary.

Video Google download

Download google video with wget. Or, if you wish, pass video URL to ie mplayer to view as stream. 1. VURL: replace with url. I.e. http://video.google.com/videoplay?docid=12312312312312313# 2. OUPUT_FILE : optionally change to a more suited name. This is the downloaded file. I.e. foo.flv # Improvements greatly appreciated. (close to my first linux command after ls -A :) ) Breakedown pipe by pipe: 1. wget: html from google, pass to stdout 2. grep: get the video url until thumbnailUrl (not needed) 3. grep: Strip off everything before http:// 4. sed: urldecode 5. echo: hex escapes 6. sed: stipr of tailing before thumbnailUrl 7. wget: download. Here one could use i.e. mplayer or other...

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