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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" }
]
```
2

mlr --c2j --jlistwrap cat file.csv

pepa65 · 2019-12-06 07:16:58 3
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 4

grep for minus (-) sign

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

grep -- -

knoppix5 · 2019-11-29 23:45:06 4

Print all git repos from a user
This is sample output - yours may be different.
14

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 4
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 " [email protected]"; echo; echo "OUTPUT:"; echo ; eval "[email protected]" | sed 's/^/ /'; }

bartonski · 2019-11-10 19:08:23 6
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 9
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 4
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 5
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 3
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 4
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 4

Top 10 Memory Processes (reduced output to applications and %usage only)

Top 10 Memory Processes (reduced output to applications and %usage only) Show Sample Output

ps aux | sort -rk 4,4 | head -n 10 | awk '{print $4,$11}'

n0a110w · 2019-10-20 22:52:55 3

Console clock

You will see it on the corner of your running terminal. Show Sample Output
This is sample output - yours may be different.
```
 Sun Oct 20 05:48:44 JST 2019
```
6

while sleep 1; do tput sc; tput cup 0 $(($(tput cols)-29)); date; tput rc; done &

rakibfiha · 2019-10-19 20:50:48 7
Hide or show Desktop Icons on MacOS

Hides all Files and Folders on the MacOS Desktop. To show files and folders, type "true" instead of "false". "Finder" at the end is case sensitive, "finder" doesn’t work
This is sample output - yours may be different.
2

defaults write com.apple.finder CreateDesktop -bool false;killall Finder

vranx · 2019-10-18 12:13:56 8
Rename all files in a directory to the md5 hash
This is sample output - yours may be different.
2

for i in *; do sum=$(md5sum $i); mv -- "$i" "${sum%% *}"; done

malsploit · 2019-10-17 08:46:22 5

Print github url for the current url

Works for repos cloned via ssh or https. Show Sample Output

git remote -v | sed -n '/github.com.*push/{s/^[^[:space:]]\+[[:space:]]\+//;s|[email protected]:|https://github.com/|;s/\.git.*//;p}'

bartonski · 2019-10-11 16:50:22 2

List the binaries installed by a Debian package

GNU grep's perl-compatible regular expression(PCRE).
This is sample output - yours may be different.
1

binaries () { dpkg -L "$1" | grep -Po '.*/bin/\K.*'; }

metropolis · 2019-10-05 10:52:15 2
List the binaries installed by a Debian package

This shell function displays a list of binaries contained in an installed package; works on Debian based Linux distributions. Show Sample Output
This is sample output - yours may be different.
```
$ binaries findutils
find
xargs
```
1

binaries () { for f in $(dpkg -L "$1" | grep "/bin/"); do basename "$f"; done; }

lordtoran · 2019-10-05 10:37:51 5
Convert tab separate file (TSV) to JSON with jq

With this command you can convert a tab separate file (TSV) into a JSON file with jq. For example, this input.tsv i-0b9adca882e5e6326 172.16.0.188 i-088dd69e5c3624888 172.16.0.102 i-0e70eac180537d4aa 172.16.0.85 will produce the showed output. Show Sample Output
This is sample output - yours may be different.
```
[
  {
    "id": "i-0b9adca882e5e6326",
    "ip": "172.16.0.188"
  },
  {
    "id": "i-088dd69e5c3624888",
    "ip": "172.16.0.102"
  },
  {
    "id": "i-0e70eac180537d4aa",
    "ip": "172.16.0.85"
  }
]
```
2

cat input.tsv | jq --raw-input --slurp 'split("\n") | map(split("\t")) | .[0:-1] | map( { "id": .[0], "ip": .[1] } )'

nordri · 2019-10-01 10:52:35 2

Top 10 Memory Processes

It displays the top 10 processes sorted by memory usage Show Sample Output

ps aux | sort -rk 4,4 | head -n 10

x3mboy · 2019-09-26 16:37:33 4

edit, view or execute last modified file with a single key-press

Copy this function to command line, press 'Enter' 'f'' 'Enter' to execute (sentence on the left written only for newbies). Hint 'e|x|v|1..9' in front of displayed last modified file name means: "Press 'e' for edit,'x' for execute,'v' for view or a digit-key '1..9' to touch one file from the recent files list to be last modified" and suggested (hidden files are listed too, else remove 'a' from 'ls -tarp' statement if not intended). If you find this function useful you can then rename it if needed and append or include into your ~/.bashrc config script. With the command . ~/.bashrc the function then can be made immediately available. In the body of the function modifications can be made, i.e. replaced joe editor command or added new option into case statement, for example 'o) exo-open $h;;' command for opening file with default application - or something else (here could not be added since the function would exceed 255 chars). To cancel execution of function started is no need to press Ctrl-C - if the mind changed and want to leave simple Enter-press is enough. Once defined, this function can with typeset -f f command be displayed in easy readable form Show Sample Output
This is sample output - yours may be different.
```
[email protected]:~/SKRIPTE$ f
...
1       rdiff_backup_to_sda3.txt
2       arrange_windows_simple_from_xfce_panel.txt
3       .config.sh
4       arrange_windows.txt
5       read1.sh
6       read3.sh
7       lsb.sh
8       board9.pgn
9       read4.sh
e|x|v|1..9 read4.sh?
```
2

f() { ls -lart;e="ls -tarp|grep -v /|tail -9";j=${e/9/1};g=${e/9/9|nl -nln};h=$(eval $j);eval $g;read -p "e|x|v|1..9 $(eval $j)?" -n 1 -r;case $REPLY in e) joe $h;;v)cat $h;;x) eval $h;;[1-9]) s=$(eval $g|egrep ^$REPLY) && touch "${s:7}" && f;;esac ; }

knoppix5 · 2019-09-26 11:58:37 2

Graphical tree of sub-directories with files

The command finds every item within the directory and edits the output so that subdirectories are and files are output much like the tree command Show Sample Output

find . -print | sed -e 's;[^/]*/;|-- ;g;s;-- |; |;g'

jonavon · 2019-09-25 17:49:35 2

restart Bluetooth from terminal
This is sample output - yours may be different.
-2

$ sudo systemctl restart bluetooth

jadnb · 2019-09-23 19:18:56 2
Hiding ur evil intent! Shame on you!

as a shell script, the possibilities are endless... #!/bin/bash echo doing something very evil! exit [2Aecho doing something very nice! Show Sample Output
This is sample output - yours may be different.
```
$ doing something very nice!
```
-1

echo 'doing something very evil' >/dev/null && echo doing something very nice!

LyscmdFUer · 2019-09-20 12:47:19 4
Write shell script without opening an editor

In this example, I’m creating a wrapper for apt-get that assumes yes every time — but the command could be anything.
This is sample output - yours may be different.
0

sudo su -c “echo -e \”\x23\x21/usr/bin/sudo /bin/bash\napt-get -y \x24\x40\” > /usr/bin/apt-yes”

realkstrawn93 · 2019-09-19 16:28:33 11
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What's this?

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Compare / diff two images

Outputs the number of different pixels. 2 params to increase tolerance: * thumbnails size * fuzz, the color distance tolerance See http://en.positon.org/post/Compare-/-diff-between-two-images for more details.

Get gzip compressed web page using wget.

Like the original command, but the -f allows this one to succeed even if the website returns uncompressed data. From gzip(1) on the -f flag: If the input data is not in a format recognized by gzip, and if the --stdout is also given, copy the input data without change to the standard output: let zcat behave as cat.

Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

Binary clock

Like 7171, but fixed typo, uses fewer variables, and even more cryptic!

Forget remembered path locations of previously ran commands

i.e.: Useful if you add ~/bin to your $PATH and you want to override locations of previously ran commands and you don't want to log out and log back in to be able to use them.

HTML5 ogg player

find OGG audio files on your *nix box and listen to them using your web browser

Batch file name renaming (copying or moving) w/ glob matching.

Remove color codes (special characters) with sed

Create an eicar.com test virus

Test whether real-time virus detection is working by running this command and checking for eicar.com in /tmp. Requires real-time scanning to be enabled and active on the /tmp directory. If scanning is active, the file should be quarantined/deleted (depending on your settings) moments after running this command. If not, the (harmless) test file should remain in your /tmp directory.

Check the current price of Bitcoin in USD

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