Commands by malathion

Commands by malathion (23)

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Get a random quote from Breaking Bad

Hit an API with curl returning a random quote, then parse the result with jq. Show Sample Output
This is sample output - yours may be different.
```
"A guy that clean has to be dirty." -- Hank Schrader
```
0

curl -s https://api.breakingbadquotes.xyz/v1/quotes | jq -r '.[] | "\"\(.quote)\" -- \(.author)"'

malathion · 2024-09-09 14:58:37 16
Get the beats per minute from an audio track

Requires bpm-tools https://www.pogo.org.uk/~mark/bpm-tools/ Show Sample Output
This is sample output - yours may be different.
```
119.900
```
1

ffmpeg -loglevel quiet -i "$AUDIO_FILE" -f f32le -ac 1 -ar 44100 - | bpm

malathion · 2023-09-16 18:55:16 86
Download Video & extract only a specific Time of it

Because this does not download more of the video than necessary, it is faster (especially with long videos).
This is sample output - yours may be different.
6

yt-dlp --external-downloader ffmpeg --external-downloader-args "-ss 00:05:00 -t 00:01:00" "https://www.youtube.com/watch?v=Y6DGABIcB3w"

malathion · 2023-09-16 18:04:12 87
Rotate a video file by 90 degrees CW

Transpose parameter: 0 = 90CounterCLockwise and Vertical Flip (default) 1 = 90Clockwise 2 = 90CounterClockwise 3 = 90Clockwise and Vertical Flip
This is sample output - yours may be different.
-1

ffmpeg -i in.mov -vf "transpose=1" out.mov

malathion · 2019-09-02 04:54:31 398
Convert & rename all filenames to lower case
This is sample output - yours may be different.
1

convmv --lower --notest FILE

malathion · 2019-08-20 05:28:08 595
Get CPU thermal data on MacOS
This is sample output - yours may be different.
3

sysctl machdep.xcpm.cpu_thermal_level

malathion · 2019-08-19 21:15:07 427
Debug pytest failures in the terminal

pudb is an ncurses debugger. This command will allow interactive debugging of test failures in pytest using pudb.
This is sample output - yours may be different.
1

pytest --pdbcls pudb.debugger:Debugger --pdb --capture=no

malathion · 2019-07-14 02:54:59 43
Get a diff of two json arrays

jq is amazing for manipulating json on the commandline, but the developers have some weird ideas about how to handle shell redirections. This command works around them. Further reading: https://github.com/stedolan/jq/issues/1110
This is sample output - yours may be different.
4

diff <(jq . -M -S < old.json) <(jq . -M -S < new.json)

malathion · 2018-10-11 20:59:48 497
Use jq to validate and pretty-print json output

The `jq` tool can also be used do validate json files and pretty print output: ` jq < file.json` Available on several platforms, including newer debian-based systems via `#sudo apt install jq`, mac via `brew install jq`, and from source https://stedolan.github.io/jq/download/ This alternative to the original avoids the useless use of cat Show Sample Output
This is sample output - yours may be different.
```
success:
{
  "foo": "bar"
}

error:
$ jq < file.json
parse error: Unmatched '}' at line 1, column 15
```
1

jq < file.json

malathion · 2018-10-03 18:46:46 460
Get the current epoch in base32
This is sample output - yours may be different.
0

obase=16; echo "$(date +%s)" | bc | xxd -r -p | base32

malathion · 2017-06-26 16:58:38 22

echo "http://commandlinefu.com" | curl -F-=\<- qrenco.de

malathion · 2017-06-22 22:27:16 19

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.
This is sample output - yours may be different.
4

python -c "import csv,json;print json.dumps(list(csv.reader(open('csv_file.csv'))))"

malathion · 2017-05-17 19:35:53 39
Runs previous command but replacing

Replaces the first instance of 'foo' with 'bar'. To replace all instances of 'foo' with 'bar': !!:gs/foo/bar/
This is sample output - yours may be different.
5

!!:s/foo/bar/

malathion · 2016-07-25 18:52:42 16
Optimal way of deleting huge numbers of files

This command works by rsyncing the target directory (containing the files you want to delete) with an empty directory. The '--delete' switch instructs rsync to remove files that are not present in the source directory. Since there are no files there, all the files will be deleted. I'm not clear on why it's faster than 'find -delete', but it is. Benchmarks here: https://web.archive.org/web/20130929001850/http://linuxnote.net/jianingy/en/linux/a-fast-way-to-remove-huge-number-of-files.html
This is sample output - yours may be different.
11

rsync -a --delete empty-dir/ target-dir/

malathion · 2016-06-07 16:56:55 18
Check your bash shell for vulnerability to the ShellShock exploit

If this command prints 'x' then your shell is vulnerable. Null output confirms that you are protected. Further reading: http://allanmcrae.com/2014/09/shellshock-and-arch-linux/ Show Sample Output
This is sample output - yours may be different.
```
x
```
3

x="() { :; }; echo x" bash -c :

malathion · 2014-12-08 22:21:18 8
Send a file to a pastebin from STDIN or a file, with a single function

echo "Hello world!" | sprunge # Redirect a stream to a pastebin sprunge ~/.bashrc # Send a file to a pastebin
This is sample output - yours may be different.
2

sprunge() { curl -F 'sprunge=<-' http://sprunge.us < "${1:-/dev/stdin}"; }

malathion · 2014-08-26 17:47:31 15
Convert PDF to JPG

Without the bashisms and unnecessary sed dependency. Substitutions quoted so that filenames with whitespace will be handled correctly.
This is sample output - yours may be different.
4

for file in *.pdf; do convert -verbose -colorspace RGB -resize 800 -interlace none -density 300 -quality 80 "$file" "${file//.pdf/.jpg}"; done

malathion · 2014-06-19 15:52:42 7
Securely destroy data on given device hugely faster than /dev/urandom

This command generates a pseudo-random data stream using aes-256-ctr with a seed set by /dev/urandom. Redirect to a block device for secure data scrambling.
This is sample output - yours may be different.
4

openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt < /dev/zero > randomfile.bin

malathion · 2014-06-02 18:12:54 8
Get a PostgreSQL servers version

Without using a pipe. -X ignores the user's .psqlrc configuration file -A sets un-aligned table output mode -t prints rows only (no headers or footers) Show Sample Output
This is sample output - yours may be different.
```
PostgreSQL 9.3.4 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.8.2 20140206 (prerelease), 64-bit
```
0

psql -X -A -t -c "SELECT version();"

malathion · 2014-05-01 18:10:20 7
List files that are not owned by any installed package

In this example I am returning all the files in /usr/bin that weren't put there by pacman, so that they can be moved to /usr/local/bin where they (most likely) belong. Show Sample Output
This is sample output - yours may be different.
```
/usr/bin/archnews
/usr/bin/evhz
/usr/bin/pager
/usr/bin/pinentry-ncurses
/usr/bin/shortping
/usr/bin/showcolors
/usr/bin/xlock
```
0

for file in /usr/bin/*; do pacman -Qo "$file" &> /dev/null || echo "$file"; done

malathion · 2014-04-22 21:57:08 11
Print average GPU core temperature
This is sample output - yours may be different.
2

nvidia-settings -q gpucoretemp -t | awk '{s+=$1}END{print s/NR}' RS=" "

malathion · 2014-01-16 17:24:09 16

Use curl with a local SOCKS5 proxy (e.g. Tor)

Routes curl input through a local SOCKS5 proxy; in this case, anonymizes curl activity via The Onion Router (Tor) proxy running locally. Note that the traffic will be anonymized, but it will NOT be encrypted, so your traffic will be very vulnerable to man-in-the-middle attacks. Show Sample Output

turl(){ curl --socks5-hostname localhost:9050 $@ ; }

malathion · 2013-07-12 17:09:16 9

Print a list of all hardlinks in the working directory, recursively

libpurple likes to hardlink files repeatedly. To ignore libpurple, use sed: | sed '/\.\/\.purple/d' Show Sample Output
This is sample output - yours may be different.
```
./.bash_logout
./.bash_styles
./.dir_colors
./dotfiles/home/.bash_logout
./dotfiles/home/.bash_styles
./dotfiles/home/.dir_colors
./dotfiles/home/.gitignore_global
./dotfiles/home/.nvidia-settings-rc
./dotfiles/home/.taskrc
./dotfiles/showcolors
./.dropbox-dist/dropbox
./.dropbox-dist/library.zip
./.gitignore_global
./.nvidia-settings-rc
./.taskrc
```
1

find . -type f -a \! -links 1

malathion · 2013-05-06 20:44:08 12

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Jump to line X in file in Nano.

Starts the cursor on line X of file foo. Useful for longer files in which it takes a long time to scroll. If X is greater than the number of lines in file foo, it will go to the last existing line.

Create date based backups

This script creates date based backups of the files. It copies the files to the same place the original ones are but with an additional extension that is the timestamp of the copy on the following format: YearMonthDay-HourMinuteSecond

Recursively remove .svn directories

list with full path

Create a 100MB file for testing transfer speed

randomize hostname and mac address, force dhcp renew. (for anonymous networking)

this string of commands will release your dhcp address, change your mac address, generate a new random hostname and then get a new dhcp lease.

Create a file of a given size in linux

If you're trying to create a sparse file, you can use dd by 'skip'ing to the last block instance. ls -ls shows the actual size vs. the reported size

Save all commands from commandlinefu.com to plain text sort by vote

Faster then other method using wget For obtain all commands use $nu=`curl http://www.commandlinefu.com/commands/browse |grep -o "Terminal - All commands -.*results$" | grep -oE "[[:digit:],]{4,}" | sed 's/,//'`; $curl http://www.commandlinefu.com/commands/browse/sort-by-votes/plaintext/[0-"$nu":25] | grep -vE "_curl_|\.com by David" > clf-ALL.txt For more version specific $nu=`curl http://www.commandlinefu.com/commands/browse |grep -o "Terminal - All commands -.*results$" | grep -oE "[[:digit:],]{4,}" | sed 's/,//'`; $curl http://www.commandlinefu.com/commands/browse/sort-by-votes/plaintext/[0-"$nu":25] | grep -vE "_curl_|\.com by David" > clf-ALL_"$nu".txt Also download dirctly from my dropbox My drop box invitaion link is http://db.tt/sRdJWvQq . Use it and get free 2.5 GB space.

display systemd log entries for sshd using "no-pager" (a bit like in pre-systemd: grep sshd /var/log/messages)

In pre-systemd systems, something like: "# grep sshd /var/log/messages" would display log events in /var/log/messages containing "sshd". # journalctl -u sshd --no-pager The above command displays similar results for systemd systems. (Note that this needs to be run with root permissions to access the log data.)

Define shell variable HISTIGNORE so that comments (lines starting with #) appear in shell history

I was surprised to find that with RedHat bash, I could not find any comment lines (begining with #) in my bash shell history. Surprised because in Mageia Linux this works. It turns out that RedHat's bash will keep comment lines if in my .bashrc, I define: export HISTIGNORE=' cd "`*: PROMPT_COMMAND=?*?' Why have comment lines in shell history? It's a handy and convenient way to make proto-commands (to be completed later) and for storing brief text data that is searchable in shell history.

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