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Download mp3 files linked in a RSS podcast feed

Directly download all mp3 files of the desired podcast
This is sample output - yours may be different.
1

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

pascalvaucheret · 2021-08-09 13:40:26 181
Color STDERR in output

This command will take the output of a command and color any STDERR output as a different color (red outline in this case) Show Sample Output
This is sample output - yours may be different.
```
This is a normal line
This is an error line # this is red outlined
```
3

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

tyzbit · 2021-08-08 14:28:50 242
Combine multiple images into a video using ffmpeg

The -start_number can be ignored if sequence starts with 0, otherwise use first number in sequence
This is sample output - yours may be different.
2

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

alikhalil · 2021-08-01 12:39:44 331
premiumize - create a ddl & save the URL in variable MYLINK
This is sample output - yours may be different.
1

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

dbiesecke · 2021-07-25 09:20:31 190

Offcloud - add a link as remote download

You will get an json respond if all is fine Show Sample Output

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"

dbiesecke · 2021-07-25 09:19:14 202

checks size of directory & delete it if its to small

only simple example how to combine rclone & jq Show Sample Output
This is sample output - yours may be different.
```
Transferred:              0 / 0 Byte, -, 0 Byte/s, ETA -
Errors:                 1 (retrying may help)   
Deleted:                0 (files), 3 (dirs)
Elapsed time:        14.2sTransferred:                    0 / 0 Byte, -, 0 Byte/s, ETA -
Errors:                 1 (retrying may help)
Deleted:                0 (files), 3 (dirs)
Elapsed time:        14.2s
2021/07/25 11:14:04 Failed to purge: unlinkat /mnt/anime/Anime/Fansub/Basquash! (2009): input/output error
```
1

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

dbiesecke · 2021-07-25 09:16:03 296
Get a range on line with sed (first two)

Get the two first lines of a file and quit. Show Sample Output
This is sample output - yours may be different.
```
first-line
second-line
```
3

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

bugmenot · 2021-07-16 07:29:15 219
Remove all the characters before last space per line including it
This is sample output - yours may be different.
1

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

bugmenot · 2021-07-16 07:17:08 181
Get line number 12 (or n) from a 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.
This is sample output - yours may be different.
2

sed -n '12p;13q' file

bugmenot · 2021-07-15 20:13:05 208
Replace all forward slashes with backward slashes

Use -i option to edit directly a file: sed -i 's|\/|\\|g' file Show Sample Output
This is sample output - yours may be different.
```
\usr\bin\
```
3

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

bugmenot · 2021-07-15 20:09:34 243
Replace all backward slashes with forward slashes

Use -i to edit file directly: sed -i 's|\\|\/|g' file Show Sample Output
This is sample output - yours may be different.
```
C:/Windows/
```
2

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

bugmenot · 2021-07-15 20:07:37 184
Remove all the characters after last space per line including it

It his example removes ' dog', last space included. Show Sample Output
This is sample output - yours may be different.
```
The quick brown fox jumps over the lazy
```
0

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

bugmenot · 2021-07-15 20:01:32 174
Download screenshot or frame from YouTube video at certain timestamp

Downloads the frame of given YouTube video at 8 minutes 14 seconds. Requested format is "299", which 1080p only video.
This is sample output - yours may be different.
-1

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

bugmenot · 2021-07-06 10:59:49 195
Colorize grep output
This is sample output - yours may be different.
1

grep --color -E 'pattern|$' file

alikhalil · 2021-07-05 16:19:25 170
Print lines in a text file with numbers in first column higher or equal than a value

A text file contains thousands of numbers. This command prints lines were the number is greater or equal than a specified value (134000000). Show Sample Output
This is sample output - yours may be different.
```
134013941.402859
134298679.533591
134694074.478486
```
1

awk '$NF >= 134000000 {print $0}' single-column-numbers.txt

bugmenot · 2021-06-30 07:48:47 164
Calculate the mean or average of a single column of numbers in a text file

single-column-numbers.txt is a text file with 22658 rows (numbers) in a single column. Each number can range from 0 to 134298679.533591 and the dot is for the decimals. This is done with perl because awk can't sum such high numbers. Show Sample Output
This is sample output - yours may be different.
```
87553740.0874476
```
1

perl -lane '$total += $F[0]; END{print $total/$.}' single-column-numbers.txt

bugmenot · 2021-06-30 07:45:56 164
find examples of multiline idioms in Linux drivers source code

The Linux Cross Referencer is nice: https://elixir.bootlin.com/linux/latest/source but when you want to find an example usage of an idiom across multiple lines, piping the ack-grep output to less is quicker. The --cc limits the search to C code, -i to ignore case, -A4 because most wait_event variants have 4 arguments that may be on lines after the function name. Use --make to search makefiles Show Sample Output
This is sample output - yours may be different.
```
--
drivers/char/ipmi/ipmb_dev_int.c:92:            ret = wait_event_interruptible(ipmb_dev->wait_queue,
drivers/char/ipmi/ipmb_dev_int.c-93-                            !list_empty(&ipmb_dev->request_queue));
drivers/char/ipmi/ipmb_dev_int.c-94-            if (ret)
drivers/char/ipmi/ipmb_dev_int.c-95-                    return ret;
drivers/char/ipmi/ipmb_dev_int.c-96-
--
```
0

ack --cc -i -A4 wait_event linux/drivers | less -i # / list_empty

peter_shook · 2021-06-25 11:03:47 139
seconds since epoch to ISO timestamp

No need to use perl, awk, nor /usr/bin/date -- bash's "printf" builtin will do it. Show Sample Output
This is sample output - yours may be different.
```
2020-11-30T11:07:30
```
2

printf '%(%FT%T)T\n' 1606752450

Mozai · 2021-06-20 05:11:20 178
Bash alias to output the current Swatch Internet Time

Output the current time in Swatch “Internet Time”, aka .beats. There are 1000 .beats in a day, and @0 is at 00:00 Central European Standard Time. This was briefly a thing in the late 1990s. More details: https://2020.swatch.com/en_ca/internet-time/ The alias is rather quote heavy to protect the subshell, so the bare command is: echo '@'$(TZ=GMT-1 date +'(%-S + %-M * 60 + %-H * 3600) / 86.4'|bc) Show Sample Output
This is sample output - yours may be different.
```
@811
```
1

alias beats='echo '\''@'\''$(TZ=GMT-1 date +'\''(%-S + %-M * 60 + %-H * 3600) / 86.4'\''|bc)'

scruss · 2021-05-27 18:42:21 192
Batch-Convert text file containing youtube links to mp3
This is sample output - yours may be different.
1

cat playlist.txt | while read line; do youtube-dl --extract-audio --audio-format mp3 -o "%(title)s.%(ext)s" ytsearch:"$line" ;done

B4ckBOne · 2021-05-20 17:19:08 174
Show current network interface in use
This is sample output - yours may be different.
3

ip addr | awk '/state UP/ {print $2}' | sed 's/.$//'

wuseman1 · 2021-05-17 16:05:35 224
scan multiple log subdirectories for the latest log files and tail them
This is sample output - yours may be different.
1

ls /var/log/* -ld | tr -s " " | cut -d" " -f9 | xargs -i{} sh -c 'echo "\n---{}---\n"; tail -n50 {}/`ls -tr {} | tail -n1`'

jgleeson · 2021-05-11 12:31:22 177
Finding the fingerprint of a given certificate
This is sample output - yours may be different.
1

openssl x509 -in cert.pem -fingerprint -noout

ohe · 2021-05-03 15:20:27 165
Fork bomb (don't actually execute)

“$0” is a variable returning the name of the script that you call it in — so running “./$0&” twice amounts to the script running itself in a separate process twice. Show Sample Output
This is sample output - yours may be different.
```
#!/bin/bash
./$0&
./$0&
```
-1

echo -e “\x23\x21/bin/bash\n\.\/\$\0\&\n\.\/\$\0\&” > bomb.sh && ./bomb.sh

realkstrawn93 · 2021-04-30 19:33:40 141
Compute newest kernel version from Makefile on Torvalds' git repository

Get newest kernel version by parsing the most bleeding-edge Makefile possible. Useful for doing things like writing live ebuilds and/or self-updating PKGBUILDs for testing purposes. Breakdown: * wget -qO - https://raw.githubusercontent.com/torvalds/linux/master/Makefile — retrieve Makefile and pipe to stdout * head -n5 — only the first 5 lines are relevant, that's where all the version variables are grep -E '\ \=\ [0-9]{1,}' — version variables always have an equals sign followed by a number * cut -d' ' -f3 — extract the individual numbers from the version variables * tr '\n' '.' — replace newlines with periods * sed -e "s/\.$// — remove trailing period Show Sample Output
This is sample output - yours may be different.
```
5.12.0
```
0

wget -qO - https://raw.githubusercontent.com/torvalds/linux/master/Makefile | head -n5 | grep -E '\ \=\ [0-9]{1,}' | cut -d' ' -f3 | tr '\n' '.' | sed -e "s/\.$//"

realkstrawn93 · 2021-04-27 17:12:05 419
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delete duplicate lines from a file and keep the order of the other lines

i wanted to delete all duplicate lines from .bash_history and keep the order of the other lines. the command cat's the file and adds line numbers, then sorts by the second column. afterwards uniq omits repeated lines, but skips the first field (the line number). then it sorts by the line numbers and at the end cuts the numbers off.

Get ethX mac addresses

I much prefer using /sbin/ip over /sbin/ifconfig for most everything. I find the interface and output to be much more consistent and it has many abilities that ifconfig, route, etc. do not. To get the mac address for only one interface, add 'show dev [interface]' to the 'ip link' part of the command: ip link show dev eth0 | grep 'link/ether' | awk '{print $2}' . Also, both this command and the ifconfig one do not require root access to run, so the sudo is not necessary.

Redirect a filehandle from a currently running process.

This command uses the debugger to attach to a running process, and reassign a filehandle to a file. The two commands executed in gdb are p close(1) which closes STDOUT and p creat("/tmp/filename",0600) which creates a file and opens it for output. Since file handles are assigned sequentially, this command opens the file in place of STDOUT and once the process continues, new output to STDOUT will instead be written to our capture file.

Prints total line count contribution per user for an SVN repository

I'm working in a group project currently and annoyed at the lack of output by my teammates. Wanting hard metrics of how awesome I am and how awesome they aren't, I wrote this command up. It will print a full repository listing of all files, remove the directories which confuse blame, run svn blame on each individual file, and tally the resulting line counts. It seems quite slow, depending on your repository location, because blame must hit the server for each individual file. You can remove the -R on the first part to print out the tallies for just the current directory.

Ping all hosts on 192.168.1.0/24

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"

Define words and phrases with google.

This function takes a word or a phrase as arguments and then fetches definitions using Google's "define" syntax. The "nl" and perl portion isn't strictly necessary. It just makes the output a bit more readable, but this also works: $define(){ local y="$@";curl -sA"Opera" "http://www.google.com/search?q=define:${y// /+}"|grep -Po '(?/dev/null;}

List all databases in Postgres and their (byte/human) sizes, ordering by byte size descending

Get a listing of all of your databases in Postgres and their sizes, ordering by the largest size first. Requires that you give the -d parameter a valid database name that you can connect to.

quick and dirty formatting for HTML code

Finds all the closing tags in a HTML document via non-greedy regex and adds a linefeed for easier reading/editing . sed -i.bak -r 's_(/[^>]*?>)_\1\n_g' filename.html . This will save a copy of filename.html as filename.html.bak and then add the linefeeds to the original file

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

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