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Before any Dell Firmware update on Ubuntu, run

After install https://linux.dell.com/repo/community/openmanage/ (Complete, all), install these packages or you will get segfaults on update and it will fail.
This is sample output - yours may be different.
0

apt install raidcfg dtk-scripts syscfg smbios-utils sfcb cim-schema dcism

pqatsi · 2020-05-29 06:49:23 42
emulate a root (fake) environment without fakeroot nor privileges
This is sample output - yours may be different.
0

unshare -r --fork --pid unshare -r --fork --pid --mount-proc bash

glaudiston · 2020-05-23 12:40:24 25
parse and format IP:port currently in listen state without net tools

Useful for containers and environments where you need to know if a port is currently in listen mode but you have not easy way or privileges to install net-tools like netstat or ss. "0A" is the code for listen state. The IP hex is reverse order and all in hex format. Show Sample Output
This is sample output - yours may be different.
```
0.0.0.0:111
10.174.109.1:53
127.0.0.53:53
0.0.0.0:22
127.0.0.1:631
0.0.0.0:8000
```
2

cat /proc/net/tcp | grep " 0A " | sed 's/^[^:]*: $..$$..$$..$$..$:$....$.*/echo $((0x\4)).$((0x\3)).$((0x\2)).$((0x\1)):$((0x\5))/g' | bash

glaudiston · 2020-05-23 12:36:21 52
Parse m3u playlist file for total time

Parse an m3u file with seconds for each item and output the length of the entire playlist Show Sample Output
This is sample output - yours may be different.
```
03:13:37
```
0

awk -F":|," '{RS="#"; sec+=$2}END{h=(sec/3600);m=((sec/60) % 60);s=(s;printf("%02d:%02d:%02d\n", h, m, s)}' file.m3u

jonavon · 2020-05-16 18:55:32 38
Fix time-stamped filenames of JPEG images according to the EXIF date the photo was taken

For each *.jpg or *.JPG file in the current directory, extract the date the photo was taken from its EXIF metadata. Then replace the date stamp, which is assumed to exist in the filename, by the date the photo was taken. A trick from https://unix.stackexchange.com/a/9256 is used to split the date into its components. Show Sample Output
This is sample output - yours may be different.
```
'2020-04-12 DSC_0146.JPG' -> '2017-12-26 DSC_0146.JPG'
'2020-04-12 DSC_0147.JPG' -> '2017-12-28 DSC_0147.JPG'
```
0

(IFS=': '; for i in *.(#i)jpg; do set $(exiv2 -K 'Exif.Image.DateTime' -Pv $i 2> /dev/null); mv -v $i "$1-$2-$3${i#[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]}"; done)

langec · 2020-05-16 12:10:00 22
Generates a TV noise alike output in the terminal

Generates a TV noise alike output in the terminal. Can be combined with https://www.commandlinefu.com/commands/view/9728/make-some-powerful-pink-noise
This is sample output - yours may be different.
7

while true;do printf "$(awk -v c="$(tput cols)" -v s="$RANDOM" 'BEGIN{srand(s);while(--c>=0){printf("\xe2\x96\\%s",sprintf("%o",150+int(10*rand())));}}')";done

ichbins · 2020-05-08 09:55:36 24
Check if port is open on remote machine

Check if port is open, if you don't have ncat on your machine. Show Sample Output
This is sample output - yours may be different.
```
Port is open
```
6

echo > /dev/tcp/127.0.0.123/8085 && echo "Port is open"

jonavon · 2020-05-03 13:30:13 28
Find which config-file is read
This is sample output - yours may be different.
0

strace 2>&1 geany |grep geany.conf

knoppix5 · 2020-04-20 19:42:39 24
Realtime lines per second in a log file, with history

This is similar to standard `pv`, but it retains the rate history instead of only showing the current rate. This is useful for spotting changes. To do this, -f is used to force pv to output, and stderr is redirected to stdout so that `tr` can swap the carriage returns for new lines. (doesn't work correctly is in zsh for some reason. Tail's output isn't redirected to /dev/null like it is in bash. anyone know why? ???????) Show Sample Output
This is sample output - yours may be different.
```
[2.00  s]
[2.00  s]
[4.20  s]
[20.4  s]
[8.20  s]
[11.6  s]
[2.02  s]
[13.9  s]
[7.19  s]
[5.00  s]
[2.00  s]
[16.4  s]
[10.8  s]
```
1

tail -f access.log | pv -l -i10 -r -f 2>&1 >/dev/null | tr /\\r \ \\n

varenc · 2020-04-19 02:07:40 23
After typing lots of commands in windows, save them to a batch file quickly

After typing the command below, you will be greeted with nothing. press the up arrow to find the previous command you typed, press enter. repeat this as many times as you need, then hit CTRL-Z and press enter to save to the 'batchfilename.bat' file.
This is sample output - yours may be different.
1

copy con batchfilename.bat

JohnnyVegas · 2020-04-17 20:26:05 53
Powershell one-line script to remove the bracketed date from filenames

Removes the annoying filehistory filename default of adding a really long UTC time and date string to every single file. Non recursive so you will have to run this per directory.
This is sample output - yours may be different.
0

Get-ChildItem -Recurse | Where-Object { $_.Name -match " ?$\d\d\d\d_\d\d_\d\d \d\d_\d\d_\d\d UTC$" } | Rename-Item -NewName { $_.Name -replace " ?$\d\d\d\d_\d\d_\d\d \d\d_\d\d_\d\d UTC$", ""}

JohnnyVegas · 2020-04-17 20:20:44 30
Downmix first audio stream from 7.1 to 5.1 keeping all other streams

Useful for Roku which does not support 7.1. Useful resources: - https://trac.ffmpeg.org/wiki/Map - https://trac.ffmpeg.org/wiki/Encode/HighQualityAudio - https://superuser.com/questions/852400/properly-downmix-5-1-to-stereo-using-ffmpeg
This is sample output - yours may be different.
0

ffmpeg -i in.mkv -map 0 -c copy -c:a:0 aac -ac:a:0 6 out.mkv

yoyoyojomo · 2020-04-16 03:47:17 21
Add timestamp of photos created by the “predictive capture” feature of Sony's Xperia camera app at the beginning of the filename

The “predictive capture” feature of Sony's Xperia camera app hides the date stamp deeply inside the filename. This command adds another date stamp at the beginning of the filename. Show Sample Output
This is sample output - yours may be different.
```
'DSCPDC_0000_BURST20191215123205830.JPG' -> '2019-12-15 DSCPDC_0000_BURST20191215123205830.JPG'
'DSCPDC_0000_BURST20200119191047162.JPG' -> '2020-01-19 DSCPDC_0000_BURST20200119191047162.JPG'
```
0

(setopt CSH_NULL_GLOB; cd /path/to/Camera\ Uploads; for i in DSCPDC_000*; do mv -v $i "$(echo $i | perl -lpe 's/(DSCPDC_[0-9]{4}_BURST)([0-9]{4})([0-9]{2})([0-9]{2})/$2-$3-$4 $1$2$3$4/')"; done)

langec · 2020-04-12 06:20:59 27
Add date stamp to filenames of photos by Sony Xperia camera app

Sony's Xperia camera app creates files without time-stamped names. Thus, after deleting files on the phone, the same names will be reused. When uploading the photos to a cloud storage, this means that files will be overwritten. Running this command after every sync of uploaded photos with the computer prevents this. Show Sample Output
This is sample output - yours may be different.
```
'DSC_0075.JPG' -> '2020-04-11 DSC_0075.JPG'
'DSC_0076.JPG' -> '2020-04-11 DSC_0076.JPG'
```
1

(setopt CSH_NULL_GLOB; cd /path/to/Camera\ Uploads; for i in DSC_* MOV_*; do mv -v $i "$(date +%F -d @$(stat -c '%Y' $i)) $i"; done)

langec · 2020-04-12 06:15:07 28

List SAN Domains for a certificate Show Sample Output

echo | openssl s_client -connect google.com:443 2>&1 | openssl x509 -noout -text | awk -F, -v OFS="\n" '/DNS:/{x=gsub(/ *DNS:/, ""); $1=$1; print $0}'

shadyabhi · 2020-04-10 06:56:51 18

Monitor ETA using pv command

You can get an approximate idea of how long your data export might take. Show Sample Output
This is sample output - yours may be different.
```
[==================================>  ] 60% ETA 0:00:01
```
-2

mysqldump --login-path=mypath sbtest sbtest4 | pv --progress --size 200m -t -e -r -a > dump.sql

shantanuo · 2020-03-30 09:15:16 58
List only empty directories and delete safely (=ask for each)

Will delete empty directories and sub-directories (hideen too = whose names are starting with dot .). Used 'rm' command instead of 'rmdir' to give the possibility of asking for confirmation before deleting i.e. it is not wise do delete all empty directories in /etc folder. Replace dot in 'find .' with any for other starting directory instead of current. in 'rm -i -R' 'i' stands for ask before delete and 'R' for delete folder recursively or folder itself if it is empty
This is sample output - yours may be different.
0

find . -type d -empty -exec rm -i -R {} \;

knoppix5 · 2020-03-29 13:12:21 30
find all executable files across the entire tree

I can think of using this command after compiling an downloaded source from anywhere as an easy way to find all executable products. We usually issue the find command (without arguments) to list the full paths of all directories and sub-directories and files in the entire current tree. Similar command is tree -aicfnF
This is sample output - yours may be different.
1

find -executable -type f

knoppix5 · 2020-03-29 11:46:18 32

Remove all cached images for icons related to your profile

Run inside Command Prompt (cmd.exe) as admin. Note that you must close explorer.exe first, and even so some files will not be deleted, will say "Access is denied." To definitely delete them enter with another admin user or from other operating system and access the drive. Show Sample Output

DEL /F /S /Q /A %LocalAppData%\Microsoft\Windows\Explorer\thumbcache_*.db

bugmenot · 2020-03-27 16:53:23 19

List packages manually installed with process currently running

Sometimes we install programs, we forget about them, and they stay there wasting RAM. This one-liner try to find them. Show Sample Output
This is sample output - yours may be different.
```
atom
virtualbox
bluez
mosquitto
teamviewer
```
1

ps -eo cmd | awk '{print $1}'| sort -u | grep "^/" | xargs dpkg -S 2>/dev/null | awk -F: '{print $1}' | sort -u | xargs apt-mark showmanual

pabloab · 2020-03-26 06:16:45 18
convert raw camera image to jpeg

raw image created by canon digital camera. Install using apt-get install ufraw
This is sample output - yours may be different.
0

for i in *.CR2; do ufraw-batch $i --out-type=jpeg --output $i.jpg; done;

shantanuo · 2020-03-22 03:08:23 26
Calculate pi to an arbitrary number of decimal places
This is sample output - yours may be different.
3

bc -l <<< "scale=1000; 4*a(1)"

cryptology_codes · 2020-03-11 15:58:21 17
Create POSIX tar archive

tar(1) and cpio(1) are not fully platform agnostic, although their file formats are specified in POSIX.1-2001. As such, GNU tar(1) might not be able to extract a BSD tar(1) archive, and ivce versa. pax(1) is defined in POSIX.1-2001. To extract an archive: pax -rf archive.tar
This is sample output - yours may be different.
3

pax -wf archive.tar /path

atoponce · 2020-03-06 13:56:46 14
Backup with versioning
This is sample output - yours may be different.
0

& 'C:\cwRsync_5.5.0_x86_Free\bin\rsync.exe' --force --ignore-errors --no-perms --chmod=ugo=rwX --checksum --delete --backup --backup-dir="_EVAC/$(Get-Date -Format "yyyy-MM-dd-HH-mm-ss")" --whole-file -a -v "//MyServer/MyFolder" "/cygdrive/c/Backup"

pascalv · 2020-03-06 10:17:42 15
Linux system calls of MySQL process
This is sample output - yours may be different.
0

strace -c -p $(pidof -s mysqld) -f -e trace=all

shantanuo · 2020-02-27 03:35:17 43
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recursively change file name from uppercase to lowercase (or viceversa)

Example of zsh globing, glob qualifier, and substitution: -Q state that the parameter will contain a glob qualifier. (**/)(*) is recursive (.) is our glob qualifier, with states the match is a file "." The first parameter $1, is then substituted with $2 but with lowercasing '(L)' ... a (U) would of course be from lower to upper.

To get how many users logged in and logged out and how many times ?

Show the UUID of a filesystem or partition

Shows the UUID of a filesystem or partition that can be used in kernel root options and in fstab. Run it without the -u option to generate more information. eg: ~/ sudo vol_id /dev/sda2 ID_FS_USAGE=other ID_FS_TYPE=swap ID_FS_VERSION=2 ID_FS_UUID=27fca13d-97b7-4d28-882c-6d03353f0a82 ID_FS_UUID_ENC=27fca13d-97b7-4d28-882c-6d03353f0a82 ID_FS_LABEL= ID_FS_LABEL_ENC=

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"

Lists installed kernels

Uptime in minute

Want to run scripts/programs in the system after starting X minute [ For letting the system to free ]? This will give uptime in minute.

Number of open connections per ip.

Here is a command line to run on your server if you think your server is under attack. It prints our a list of open connections to your server and sorts them by amount. BSD Version: $ netstat -na |awk '{print $5}' |cut -d "." -f1,2,3,4 |sort |uniq -c |sort -nr

Print every Nth line

Sometimes commands give you too much feedback. Perhaps 1/100th might be enough. If so, every() is for you. $ my_verbose_command | every 100 will print every 100th line of output. Specifically, it will print lines 100, 200, 300, etc If you use a negative argument it will print the *first* of a block, $ my_verbose_command | every -100 It will print lines 1, 101, 201, 301, etc The function wraps up this useful sed snippet: $ ... | sed -n '0~100p' don't print anything by default $ sed -n starting at line 0, then every hundred lines ( ~100 ) print. $ '0~100p' There's also some bash magic to test if the number is negative: we want character 0, length 1, of variable N. $ ${N:0:1} If it *is* negative, strip off the first character ${N:1} is character 1 onwards (second actual character).

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

generate a randome 10 character password

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