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Silently Execute a Shell Script that runs in the background and won't die on HUP/logout
This is sample output - yours may be different.
0

(nohup your-command your-args &>/dev/null &)

socketz · 2018-05-23 17:35:43 0
Parallel Apache Benchmark

(echo "https://example.com/"; echo "https://example.com/"; echo "https://example.com/"; echo "https://example.com/") | parallel -k 'ab -n 10000 -c 15 {}'
This is sample output - yours may be different.
0

cat url_list.txt | parallel -k 'ab -n 10000 -c 15 {}'

emphazer · 2018-05-17 11:23:28 0
Check if loopback network interface is working
This is sample output - yours may be different.
0

sudo tcpdump -i lo -nv ip

Dmitry · 2018-05-16 12:23:12 0
hardcode dnsserver, no more rewriting of etc/resolv.conf

man NetworkManager.conf ... none: NetworkManager will not modify resolv.conf. This implies rc-manager unmanaged Show Sample Output
This is sample output - yours may be different.
```
[main]
dns=none
#plugins=ifcfg-rh,ibft
```
0

f="/etc/NetworkManager/NetworkManager.conf"; if ! grep ^dns $f > /dev/null; then sudo sed -i.bkp '/\[main\]/a dns=none' $f; fi

ksvnix · 2018-05-15 18:17:49 0
Export only one SVG element by ID.

-z, --without-gui -j, --export-id-only -i, --export-id=ID -l, --export-plain-svg=FILENAME In Inkscape Press Ctrl-Shift-o to open object properties panel to give ID to a selected element
This is sample output - yours may be different.
0

inkscape project.svg -z -j -i icon.svg -l b.svg

atemvm · 2018-05-15 14:16:35 0
small CPU benchmark with PI, bc and time.

# 4 cores with 2500 pi digits CPUBENCH 4 2500 . every core will use 100% cpu and you can see how fast they calculate it. if you do 50000 digitits and more it can take hours or days Show Sample Output
This is sample output - yours may be different.
```
CPUBENCH 3 5000
Cores: 3
Digit: 5000

real	0m18.680s
user	0m18.678s
sys	0m0.005s

real	0m18.901s
user	0m18.869s
sys	0m0.035s

real	0m18.902s
user	0m18.899s
sys	0m0.005s
```
0

CPUBENCH() { local CPU="${1:-1}"; local SCALE="${2:-5000}"; { for LOOP in `seq 1 $CPU`; do { time echo "scale=${SCALE}; 4*a(1)" | bc -l -q | grep -v ^"[0-9]" & } ; done }; echo "Cores: $CPU"; echo "Digit: $SCALE" ;}

emphazer · 2018-05-14 17:30:37 0
find and reduce 8x parallel the size of JPG images without loosing quality via jpegoptim
This is sample output - yours may be different.
0

find /var/www/ -type f -name '*.[jJ][pP][gG]' -print0 | xargs -n 1 -P 8 -0 jpegoptim --strip-all --preserve --preserve-perms --quiet

emphazer · 2018-05-14 16:39:21 0
find and reduce 8x parallel the size of PNG images without loosing quality via optipng
This is sample output - yours may be different.
0

find /var/www/ -type f -name '*.[pP][nN][gG]' -print0 | xargs -L 1 -n 1 -P 8 -0 optipng -preserve -quiet -o7 -f4 -strip all

emphazer · 2018-05-14 16:38:11 1
Blackhole any level zones via dnsmasq

Explanation It creates dnsmasq-com-blackhole.conf file with one line to route all domains of com zones to 0.0.0.0 You might use "address=/home.lab/127.0.0.1" to point allpossiblesubdomains.home.lab to your localhost or some other IP in a cloud. Show Sample Output
This is sample output - yours may be different.
```
#on ubuntu/debian
echo "address=/com/0.0.0.0" | sudo tee /etc/NetworkManager/dnsmasq.d/dnsmasq-com-blackhole.conf && sudo systemctl restart network-manager

#on redhat/centos
echo "address=/com/0.0.0.0" | sudo tee /etc/dnsmasq.d/dnsmasq-com-blackhole.conf && sudo systemctl restart dnsmasq
```
0

echo "address=/com/0.0.0.0" | sudo tee /etc/dnsmasq.d/dnsmasq-com-blackhole.conf && sudo systemctl restart dnsmasq

emphazer · 2018-05-14 16:28:18 1
hardcode dnsserver, no more rewriting of etc/resolv.conf

The while loop is an overkill, it would be simpler to prevent the file to be modified. That said, none of the proposed solutions are such: a real one would go to the source of the problem.
This is sample output - yours may be different.
-1

chkmod -w /etc/resolve.conf

ntropia · 2018-05-14 16:25:47 2
hardcode dnsserver, no more rewriting of etc/resolv.conf

runs in background rewriting /etc/resolv.conf periodically dns
This is sample output - yours may be different.
-2

while sudo sed -i -e 's/^$nameserver$.*$/\1 $dns/' /etc/resolv.conf; do sleep 15; done &

dav23r · 2018-05-14 16:03:08 1

a quick function for searching changed files. just copy it in the bash Show Sample Output

FINDDATE() { LOCATION="${1:-.}"; find ${LOCATION} -type f -print0 | xargs -0 stat -c "%y %n" | sort | sed 's/.$[0-9]$\{9,\} +0[1-2]00/\t/' | sed 's/ /\t/g' }

emphazer · 2018-05-14 14:27:41 0

Calculates the number of physical cores considering HyperThreading in AWK

Check whether hyperthreading is enabled or not. a better solution as nproc should work on all OS with awk Show Sample Output
This is sample output - yours may be different.
```
# example: 4xCPU 24xHT Cores
48
```
1

awk -F: '/^core id/ && !P[$2] { CORES++; P[$2]=1 }; /^physical id/ && !N[$2] { CPUs++; N[$2]=1 }; END { print CPUs*CORES }' /proc/cpuinfo

emphazer · 2018-05-14 14:17:33 0
Determines latest pdf file downloaded by firefox in ~/Downloads directory
This is sample output - yours may be different.
0

ls -tr ~/Downloads/*.pdf|tail -1

masroor · 2018-05-14 14:01:55 0
find with high precission (nanoseconds 1/1,000,000,000s) the last changed file.

this is good for variables if you have many script created files and if you want to know which one is the last created/changed one..
This is sample output - yours may be different.
1

find . -type f -print0 | xargs -0 stat -c '%y %n' | sort -n -k 1,1 -k 2,1 | awk 'END{print $NF}'

emphazer · 2018-05-14 08:47:41 0
Copy file to a Windows/Samba share without mounting it

This commando copies the file (which must reside in the current directory) to //<server>/<share-name>/<subdirectory>/<file> through the CIFS protocol (Samba share or Windows Share). It doesn't require you to mount the filesystem first. --directory "<subdirectory>" may be omitted in order to copy the file the the root of the share. The "%password" part may also be omitted. If doing so, smbclient will ask for the password interactively. To copy a file from a Windows/Samba share, change "put" for "get". smbclient --user=user%password --directory "<subdirectory>" --command "get <file>" //<server>/<share-name> Show Sample Output
This is sample output - yours may be different.
```
Domain=[STORAGE] OS=[Windows 10 Pro 16299] Server=[Windows 10 Pro 6.3]
putting file backup-20180512.tar.xz as \server\backup-20180512.tar.xz (37065.5 kb/s) (average 37065.5 kb/s)
```
1

smbclient --user=user%password --directory "<subdirectory>" --command "put <file>" //<server>/<share-name>

quitaiskiluisf · 2018-05-12 19:18:42 0
Number of CPU's in a system

This appears to do the same. Utility is verified to be present on Ubuntu and OpenSuse out-of-the-box. Show Sample Output
This is sample output - yours may be different.
```
8
```
2

$ nproc

itenev · 2018-05-12 17:31:16 1

Benchmark SQL Query

Benchmark a SQL query against MySQL Server. The example runs the query 10 times, and you get the average runtime in the output. To ensure that the query does not get cached, use `RESET QUERY CACHE;` on top in the query file. Show Sample Output

perf stat -r 10 sh -c "mysql > /dev/null < query.sql"

particleflux · 2018-05-03 12:20:03 0

Count items in JSON array

Pipe any JSON to jq, then count with the appropiate expression and use the | length on the array
This is sample output - yours may be different.
0

echo '[1,2,3]' | jq '. | length'

particleflux · 2018-05-03 06:34:05 0
Get the Volume labels all bitlocker volumes had before being encrypted

Get information of volume labels of bitlocker volumes, even if they are encrypted and locked (no access to filesystem, no password provided). Note that the volume labels can have spaces, but only if you name then before encryption. Renaming a bitlocker partition after being encrypted does not have the same effect as doing it before. Show Sample Output
This is sample output - yours may be different.
```
BitLocker Volume labels:
/dev/nvme0n1p3 -> "OS_Install"
/dev/sda1 -> "DATA"
/dev/sdb1 -> "MY PEN"
```
2

sudo echo "BitLocker Volume labels:" && sudo dislocker-find | xargs -I{} sh -c 'echo -n "{} ->+ " ; sudo dislocker-metadata -V {} | grep string' | sed 's/+.*string://' | sed "s/'[^ ]* /\"/g" | sed 's/\ [^ ]*$/"/'

bugmenot · 2018-04-29 01:00:11 1
list block devices

Shows all block devices in a tree with descruptions of what they are.
This is sample output - yours may be different.
2

sudo lsblk -o name,type,fstype,label,partlabel,model,mountpoint,size

bugmenot · 2018-04-25 00:16:39 0
Arch Linux sort installed packages by size

This version accounts for the MiB/KiB suffix output by pacman these days.
This is sample output - yours may be different.
0

pacman -Qi | grep 'Name\|Size\|Description' | cut -d: -f2 | paste - - - | awk -F'\t' 'BEGIN{ s["MiB"]=1024; s["KiB"]=1;} {split($3, a, " "); print a[1] * s[a[2]], "KiB", $1}' | sort -n

Timo · 2018-04-24 13:29:57 0
Lower jpg quality
This is sample output - yours may be different.
0

find -type f -name '*.jpg' -exec mogrify -quality 70% '{}' \;

specktator_ · 2018-04-24 08:33:33 2
simple pomodoro
This is sample output - yours may be different.
0

while true; do sleep $((40 * 60)); echo "Fuck away for some time"; sleep $((3 * 60)); done &

dav23r · 2018-04-23 10:37:19 0
List all information about all files (in current dir)

This is a funny usage of the traditional command ls. It could be basically simplified as: ls -a -l Duplicating arguments is permitted: ls -a -l -l And this markup could be shortened as: ls -al Extra note: To view filesizes like a pro, pray for your God: ls -allah Show Sample Output
This is sample output - yours may be different.
```
total 16
drwxr-xr-x 2 led led 4096 Apr 20 12:55 .
drwxr-xr-x 4 led led 4096 Apr 20 12:55 ..
-rw-r--r-- 1 led led 1026 Apr 20 12:55 lib.sh
-rw-r--r-- 1 led led    0 Apr 20 12:55 somefile
-rw-r--r-- 1 led led    2 Apr 20 12:55 somefile_with_content
```
1

ls -all

lezsakdomi · 2018-04-20 11:00:42 1
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