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generate pem cert from host with ssl port
This is sample output - yours may be different.
0

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

dbiesecke · 2021-09-01 14:05:36 65
Get all lines that start with a dot or period

Read a file or standard input and only outputs lines that start with a dot or period "." Show Sample Output
This is sample output - yours may be different.
```
.config
```
0

grep '^\.' file

bugmenot · 2021-08-22 16:04:11 105
Store Host IP in variable
This is sample output - yours may be different.
-1

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

wuseman1 · 2021-08-10 03:48:21 86
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

pascalv · 2021-08-09 13:40:26 77
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 91
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 12:39:44 143
premiumize - create a ddl & save the URL in variable MYLINK
This is sample output - yours may be different.
1

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

dbiesecke · 2021-07-25 09:20:31 60

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 89

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 74
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 83
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 75
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 83
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 20:09:34 113
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 79
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 62
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 71
Colorize grep output
This is sample output - yours may be different.
2

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

alikhalil · 2021-07-05 16:19:25 58
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 71
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 53
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 51
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 64
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 85
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 64
Show current network interface in use
This is sample output - yours may be different.
1

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

wuseman1 · 2021-05-17 16:05:35 120
scan multiple log subdirectories for the latest log files and tail them
This is sample output - yours may be different.
0

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 79
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cat a bunch of small files with file indication

If you have a bunch of small files that you want to cat to read, you can cat each alone (boring); do a cat *, and you won't see what line is for what file, or do a grep . *. "." will match any string and grep in multifile mode will place a $filename: before each matched line. It works recursively too!!

Watch the progress of 'dd'

The 'dd' command doesn't provide a progress when writing data. So, sending the "USR1" signal to the process will spit out its progress as it writes data. This command is superior to others on the site, as it doesn't require you to previously know the PID of the dd command.

Quickly ping range of IP adresses and return only those that are online

Download Youtube video with wget!

Nothing special required, just wget, sed & tr!

fetch all revisions of a specific file in an SVN repository

exported files will get a .r23 extension (where 23 is the revision number)

Grep syslog today last hour

Uses date to grep de logfile for today and uses it to get the last hour logs. Can be used to get last minute logs or today's logs.

Matrix Style

Solves "tr" issues with non C-locales under BSD-like systems (like OS X)

List only executables installed by a debian package

Safe for whitespaces in names.

Find the 10 users that take up the most disk space

recursively walk down no more than three levels and grab any file with an extension of mp3, mpg, mpeg, or avi

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