All commands

Infinite loop ssh

minnmass — Wed, 29 Sep 2021 14:53:55 +0000

$ until ssh login@10.0.0.1; do echo "Nope, keep trying!"; fi; sleep 10; done

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Infinite loop ssh

FluffyBrick — Wed, 29 Sep 2021 12:54:17 +0000

$ while true; do ssh login@10.0.0.1; if [[ $? -ne 0 ]]; then echo "Nope, keep trying!"; fi; sleep 10; done

Useful when you wait for a server to boot up.

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Download SSL/TLS pem format cert from https web host

zhangtai (http://zhangtai.me) — Fri, 24 Sep 2021 02:37:00 +0000

$ openssl s_client -showcerts -connect google.com:443 </dev/null 2>/dev/null|openssl x509 -outform PEM > /tmp/google.com.cer

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Add a DNS server on the fly

x3mboy (http://x3mlinux.wordpress.com) — Tue, 21 Sep 2021 14:43:48 +0000

$ sudo systemd-resolve --interface <NombreInterfaz> --set-dns <IPDNS> --set-domain mydomain.com

Since systemd-resolved was implemented, add a DNS server have become weirder and harder than before. With this command, you can add a DNS server on-the-fly tied to an specific interface

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Windows telnet

EBAH (http://ebah80.blogspot.com/) — Thu, 16 Sep 2021 16:11:04 +0000

$ Test-NetConnection -ComputerName example.com -Port 443

Check if TCP port is reacheable

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Superfast portscanner

wuziduzi — Tue, 14 Sep 2021 16:15:51 +0000

$ time seq 65535 | parallel -k --joblog portscan -j9 --pipe --cat -j200% -n9000  --tagstring  '\033[30;3{=$_=++$::color%8=}m'  'nc -vz localhost $(head -n1 {})-$(tail -n1 {})'

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Clear Cached Memory on Ubuntu

tg0000 (http://www.youtube.com/TimothyGott) — Mon, 13 Sep 2021 16:45:20 +0000

$ sudo free && sync && sudo echo 3 | sudo tee /proc/sys/vm/drop_caches

Clear Cached Memory on Ubuntu based distributions, and also display memory status. Please do not use this on a production machine unless you really really know what you are doing. Echo 3 is a kinder way of purging the memory, you can also use 'echo 2' or 'echo 1' if #1 You know what you are doing, and #2 refer to number 1 :-)

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Check a directory of PNG files for errors

Negate — Sun, 05 Sep 2021 00:37:07 +0000

$ ls *.png |parallel --nice 19 --bar --will-cite "pngcheck -q {}"

Useful for checking if a large number of PNG files was downloaded successfully by verifying the built-in CRC checksum. For incomplete files, the command will print: "00002309.png EOF while reading IDAT data ERROR: 00002309.png" The process is very fast; checking 21,000 files of 5MB in size took only five minutes on a 2011 Intel mobile dual-core.

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Banner Grabber

wuziduzi — Fri, 03 Sep 2021 00:18:05 +0000

$ bash -c 'exec 3<>/dev/tcp/google.com/80; echo EOF>&3; cat<&3'

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generate pem cert from host with ssl port

dbiesecke — Wed, 01 Sep 2021 14:05:36 +0000

$ openssl s_client -connect HOSTNAME.at:443 -showcerts </dev/null 2>/dev/null | openssl x509 -outform PEM > meinzertifikat.pem

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Get all lines that start with a dot or period

bugmenot — Sun, 22 Aug 2021 16:04:11 +0000

$ grep '^\.' file

Read a file or standard input and only outputs lines that start with a dot or period "."

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Store Host IP in variable

wuziduzi — Tue, 10 Aug 2021 03:48:21 +0000

$ export IP="$(hostname -I | awk '{print $1}')"

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Download mp3 files linked in a RSS podcast feed

pascalv — Mon, 09 Aug 2021 13:40:26 +0000

$ curl http://radiofrance-podcast.net/podcast09/rss_14726.xml | grep -Eo "(http|https)://[a-zA-Z0-9./?=_%:-]*mp3" | sort -u | xargs wget

Directly download all mp3 files of the desired podcast

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Color STDERR in output

tyzbit (http://qtosw.com) — Sun, 08 Aug 2021 14:28:50 +0000

$ ./errorscript.sh 2> >(echo "\e[0;41m$(cat)\e[0m")

This command will take the output of a command and color any STDERR output as a different color (red outline in this case)

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Combine multiple images into a video using ffmpeg

alikhalil — Sun, 01 Aug 2021 12:39:44 +0000

$ ffmpeg -start_number 0053 -r 1/5 -i IMG_%04d.JPG -c:v libx264 -vf fps=25 -pix_fmt yuv420p out.mp4

The -start_number can be ignored if sequence starts with 0, otherwise use first number in sequence

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premiumize - create a ddl & save the URL in variable MYLINK

dbiesecke — Sun, 25 Jul 2021 09:20:31 +0000

$ MYLINK=$(curl  'https://www.premiumize.me/api/transfer/directdl?apikey=dzx3rqwrxme8iazu' \   -H 'accept: application/json' \   -H 'Content-Type: application/x-www-form-urlencoded'  --data-raw 'src='$URL | jq -r '.content[] | .link' )

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Offcloud - add a link as remote download

dbiesecke — Sun, 25 Jul 2021 09:19:14 +0000

$ curl  'https://offcloud.com/api/remote?key=XXXXXX' \   -H 'accept: application/json' \   -H 'Content-Type: application/x-www-form-urlencoded'  --data-raw "url=$MYLINK&remoteOptionId=XXXXX"

You will get an json respond if all is fine

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checks size of directory & delete it if its to small

dbiesecke — Sun, 25 Jul 2021 09:16:03 +0000

$ for i in *;  do test -d "$i" && ( rclone size "$i" --json -L 2> /dev/null | jq --arg path "$i" 'if .bytes < 57462360 then ( { p: $path , b: .bytes}) else "none" end' | grep -v none | jq -r '.p' | parallel -j3 rclone purge "{}" -v -P ); done

only simple example how to combine rclone & jq

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Get a range on line with sed (first two)

bugmenot — Fri, 16 Jul 2021 07:29:15 +0000

$ sed -n '1,2p;3q' file

Get the two first lines of a file and quit.

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Remove all the characters before last space per line including it

bugmenot — Fri, 16 Jul 2021 07:17:08 +0000

$ echo 'The quick brown fox jumps over the lazy dog' | sed 's|.* ||'

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Get line number 12 (or n) from a file

bugmenot — Thu, 15 Jul 2021 20:13:05 +0000

$ sed -n '12p;13q' file

Extracts only file number 12 from file. It's meant for text files. Replace 12 with the number you want. First line starts at 1 not 0. We use q on next line so doesn't process any line more.

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Replace all forward slashes with backward slashes

bugmenot — Thu, 15 Jul 2021 20:09:34 +0000

$ echo '/usr/bin/' | sed 's|\/|\\|g'

Use -i option to edit directly a file: sed -i 's|\/|\\|g' file

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Replace all backward slashes with forward slashes

bugmenot — Thu, 15 Jul 2021 20:07:37 +0000

$ echo 'C:\Windows\' | sed 's|\\|\/|g'

Use -i to edit file directly: sed -i 's|\\|\/|g' file

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Remove all the characters after last space per line including it

bugmenot — Thu, 15 Jul 2021 20:01:32 +0000

$ echo 'The quick brown fox jumps over the lazy dog' | sed 's|$.*$ .*|\1|'

It his example removes ' dog', last space included.

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Download screenshot or frame from YouTube video at certain timestamp

bugmenot — Tue, 06 Jul 2021 10:59:49 +0000

$ ffmpeg -ss 8:14 -i $(youtube-dl -f 299 --get-url URL) -vframes 1 -q:v 2 out.jpg

Downloads the frame of given YouTube video at 8 minutes 14 seconds. Requested format is "299", which 1080p only video.

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