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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
```
5

$ nproc

itenev · 2018-05-12 17:31:16 0

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.
1

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 0
list block devices

Shows all block devices in a tree with descruptions of what they are.
This is sample output - yours may be different.
4

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 0
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
```
2

ls -all

lezsakdomi · 2018-04-20 11:00:42 0
check squid logs for time value greater than 9000ms
This is sample output - yours may be different.
0

cat squid.log| awk -v x=9000 '$2 >=x' | sort -hs| tail -n 100

calicowboy54 · 2018-04-11 21:04:20 0
Using graphicsmagick, over an image transform the white color to transparent background
This is sample output - yours may be different.
0

gm convert source.png -transparent white result.png

andresaquino · 2018-04-10 19:07:36 0
Check the total memory usage of processes with a specific name

Get the total RESIDENT memory used by processes of a specific name. This means this is the MINIMUM used by a process, but some memory could be paged out to swap. Show Sample Output
This is sample output - yours may be different.
```
$ pids=$(pidof chrome); for p in ${pids[@]}; do cat /proc/$p/status | grep -i vmrss | awk '{print $2}'; done | while read m; do let t=$t+$m; echo $t; done | echo "$(tail -n 1) kB"
12613760 kB
```
0

pids=$(pidof chrome); for p in ${pids[@]}; do cat /proc/$p/status | grep -i vmrss | awk '{print $2}'; done | while read m; do let t=$t+$m; echo $t; done | echo "$(tail -n 1) kB"

tyzbit · 2018-04-08 16:43:35 1
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"
This is sample output - yours may be different.
2

lsof -iTCP:80 -sTCP:LISTEN

indexsmithy · 2018-04-07 16:20:25 0
install only security patch on suse
This is sample output - yours may be different.
0

zypper lp | awk '$5=="security" { print "zypper install -y -n -t patch "$3}' | grep -v "needed" | sh +x

brennquin · 2018-04-04 22:14:45 0
Remove a passphrase from a private key
This is sample output - yours may be different.
0

openssl rsa -in privateKey.pem -out newPrivateKey.pem

aysadk · 2018-04-04 13:35:54 0
Generate a certificate signing request based on an existing certificate
This is sample output - yours may be different.
-1

openssl x509 -x509toreq -in certificate.crt -out CSR.csr -signkey privateKey.key

aysadk · 2018-04-04 13:35:34 0
Generate a certificate signing request (CSR) for an existing private key
This is sample output - yours may be different.
-1

openssl req -out CSR.csr -key privateKey.key -new

aysadk · 2018-04-04 13:35:19 0
Generate a self-signed certificate
This is sample output - yours may be different.
-1

openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -keyout privateKey.key -out certificate.crt

aysadk · 2018-04-04 13:35:03 0
Generate a new private key and Certificate Signing Request
This is sample output - yours may be different.
-1

openssl req -out CSR.csr -new -newkey rsa:2048 -nodes -keyout privateKey.key

aysadk · 2018-04-04 13:34:40 0
Check a PKCS#12 file (.pfx or .p12)
This is sample output - yours may be different.
0

openssl pkcs12 -info -in keyStore.p12

aysadk · 2018-04-04 13:33:29 0
ssl Check a certificate
This is sample output - yours may be different.
0

openssl x509 -in certificate.crt -text -noout

aysadk · 2018-04-04 13:33:15 0
ssl Check a private key
This is sample output - yours may be different.
0

openssl rsa -in privateKey.key -check

aysadk · 2018-04-04 13:33:00 0
ssl Check a Certificate Signing Request (CSR)
This is sample output - yours may be different.
0

openssl req -text -noout -verify -in CSR.csr

aysadk · 2018-04-04 13:32:43 0
Convert a PEM certificate file and a private key to PKCS#12 (.pfx .p12)
This is sample output - yours may be different.
0

openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt -certfile CACert.crt

aysadk · 2018-04-04 13:32:20 0
Convert a PKCS#12 file (.pfx .p12) containing a private key and certificates to PEM
This is sample output - yours may be different.
0

openssl pkcs12 -in keyStore.pfx -out keyStore.pem -nodes

aysadk · 2018-04-04 13:32:02 0
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Remote copy directories and files through an SSH tunnel host

If you have lots of remote hosts sitting "behind" an ssh proxy host, then there is a special-case use of "rsynch" that allows one to easily copy directories and files across the ssh proxy host, without having to do two explicit copies: the '-e' option allows for a replacement "rsh" command. We use this option to specify an "ssh" tunnel command, with the '-A' option that causes authentication agent requests to be forwarded back to the local host. If you have ssh set up correctly, the above command can be done without any passwords being entered.

In (any) vi, add a keystroke to format the current paragraph.

That goes into your $HOME/.exrc file. " Nice macro to reformat lines: map ^A !}fmt Note that the ^A has to be input by typing ^V^A.

list files recursively by size

Do a command but skip recording it in the bash command history

Note the extra space before the command (I had to put it as an underscore since the website eats up preceding spaces). That's all it takes. Now if you check your history with "$ history", it wont show up.

Remove \r (carriage return) in a file

Sort files in folders alphabetically

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

Download an Entire website with wget

Inverted cowsay

It's quite fun to invert text using "flip.pl" (ref: http://ubuntuforums.org/showthread.php?t=2078323 ). Slightly more challenging is to flip a whole "cowsay". :-)

chmod - change file permissions of a file to be similar of another

Join lines

This command turns a multi-line file into a single line joined with <SOMETEXT>. To skip blank lines, use: $ perl -pe '(eof()||s/^\s*$//)||s/\n//g' file.txt

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