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Convert uppercase to lowercase extensions

Using a for loop, rename all files with .MP3 extension to .mp3. Show Sample Output
This is sample output - yours may be different.
```
All *.MP3 in $PWD will be turned to .mp3
```
0

find . -type f -name *.MP3 -print0 | xargs -0 -i rename .MP3 .mp3 {}

pibarnas · 2012-04-29 02:44:44 5
creating an USB Image
This is sample output - yours may be different.
0

sudo dd if=/your.img of=/dev/rdiskx bs=1m

raaiman · 2012-10-30 05:57:33 4
Descargar video desde youtube en linux
This is sample output - yours may be different.
0

youtube-dl urldelvideoyoutube

cvargasc · 2013-04-23 14:54:58 6
Show numerical values for each of the 256 colors in ZSH

Prints an easy-to-copy color code for each color. Show Sample Output
This is sample output - yours may be different.
```
\e[38;05;1m
\e[38;05;2m
\e[38;05;3m
```
0

for i in {0..255}; do echo -e "\e[38;05;${i}m\\\e[38;05;${i}m"; done | column -c 80 -s ' '; echo -e "\e[m"

derv82 · 2013-07-05 07:16:19 6
count match string lines from file(s)

-c will count the number of times your search matches in the file. Show Sample Output
This is sample output - yours may be different.
```
$ cat file.txt
hello
goodbye
hello
$
$ grep -c "hello" file.txt
2
$
```
0

grep -c "search_string" /path/to/file

meatflag · 2013-12-10 18:13:54 7
Create a nifty overview of the hardware in your computer

entering this command as root may give more complete results, creating a tmp file, and immediately opening the file might be more useful
This is sample output - yours may be different.
0

sudo lshw -html > /tmp/hardware.html && xdg-open /tmp/hardware.html

Sadi · 2014-03-08 10:40:21 7
Look PHP Version

if you want to look php version on linux Show Sample Output
This is sample output - yours may be different.
```
PHP 5.3.3 (cli) (built: Dec 11 2013 03:29:57)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
```
0

php -v

warkirasep · 2014-06-20 00:04:01 6
Creating Harddisk image and saving on remote server

By this command you can take the snapshot of you harddisk (full) and create the image , the image will be directly store on remote server through ssh. Here i am creating the image of /dev/hda and saving it at 4.2.2.2 as /root/server.img.
This is sample output - yours may be different.
0

dd if=/dev/hda | ssh root@4.2.2.2 'dd of=/root/server.img'

suyashjain · 2014-10-13 13:43:47 7
Show drive names next to their full serial number (and disk info)

This is much easier to parse and do something else with (eg: automagically create ZFS vols) than anything else I've found. It also helps me keep track of which disks are which, for example, when I want to replace a disk, or image headers in different scenarios. Being able to match a disk to the kernels mapping of said drive the disks serial number is very helpful ls -l /dev/disk/by-id Normal `ls` command to list contents of /dev/disk/by-id grep -v "wwn-" Perform an inverse search - that is, only output non-matches to the pattern 'wwn-' egrep "[a-zA-Z]{3}$" A regex grep, looking for three letters and the end of a line (to filter out fluff) sed 's/\.\.\/\.\.\///' Utilize sed (stream editor) to remove all occurrences of "../../" sed -E 's/.*[0-9]{2}:[0-9]{2}\s//' Strip out all user and permission fluff. The -E option lets us use extended (modern) regex notation (larger control set) sed -E 's/->\ //' Strip out ascii arrows "-> " sort -k2 Sort the resulting information alphabetically, on column 2 (the disk letters) awk '{print $2,$1}' Swap the order of the columns so it's easier to read/utilize output from sed 's/\s/\t/' Replace the space between the two columns with a tab character, making the output more friendly For large ZFS pools, this made creating my vdevs immeasurably easy. By keeping track of which disks were in which slot (spreadsheet) via their serial numbers, I was able to then create my vols simply by copying and pasting the full output of the disk (not the letter) and pasting it into my command. Thereby allowing me to know exactly which disk, in which slot, was going into the vdev. Example command below. zpool create tank raidz2 -o ashift=12 ata-... ata-... ata-... ata-... ata-... ata-... Show Sample Output
This is sample output - yours may be different.
```
sda     ata-Samsung_SSD_840_PRO_Series_SERIALSERIAL
sdb     ata-WDC_WD30EFRX-INFOINFOINFO
sdc     ata-WDC_WD30EFRX-INFOINFOINFO
sdd     ata-WDC_WD30EFRX-INFOINFOINFO
sde     ata-WDC_WD30EFRX-INFOINFOINFO
sdf     ata-WDC_WD30EFRX-INFOINFOINFO
```
0

ls -l /dev/disk/by-id |grep -v "wwn-" |egrep "[a-zA-Z]{3}$" |sed 's/\.\.\/\.\.\///' |sed -E 's/.*[0-9]{2}:[0-9]{2}\s//' |sed -E 's/->\ //' |sort -k2 |awk '{print $2,$1}' |sed 's/\s/\t/'

lig0n · 2015-01-25 19:29:40 8
Resume incomplete youtube-dl video files

Resume incomplete youtube-dl video files. Assuming mp4 format here.
This is sample output - yours may be different.
0

ls *.part | sed 's/^.*-$.\{11,11\}$\.mp4\.part$/\1/g' - | youtube-dl -i -f mp4 -a -

agp · 2017-02-28 23:31:55 21
Send notify to Kodi

(Tested on LibreElec8 and Openelec8)
This is sample output - yours may be different.
0

MESSAGE1="mytext";MESSAGE2="text2";curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","method":"GUI.ShowNotification","params":{"title":"'"$MESSAGE1"'","message":"'"$MESSAGE2"'", "displaytime":27000},"id":1}' http://kodiip:5661/jsonrpc

Imz · 2017-06-06 10:48:13 16
Rename duplicate files created by GDrive

Changes files like "temp (2).txt" to "temp.txt". Does not overwrite files that already exist.
This is sample output - yours may be different.
0

find . -name "*$2$*" -exec rename -s \ $2$ '' -n {} +

buddacow · 2017-06-30 04:33:50 17
du show hidden files all files
This is sample output - yours may be different.
0

du -sch .[!.]* * |sort -h

aysadk · 2017-08-17 20:46:15 21
Create a local compressed tarball from remote host directory

untar in place with out creating a temporary file
This is sample output - yours may be different.
0

ssh user@host "tar -zcf - /path/to/dir" | tar -xvz

sandeep048 · 2017-10-07 11:37:51 18
Command line invocation of ImageMagick to resize a file

convert -resize 750?500 -quality 80% *.jpg These are command-line invocations of ImageMagick functions. The first sizes an image file to 40% of original and saves it to a different name, while the second makes all jpg files in a directory sized to 750x500 pixels. Such a pleasure not to need to point and click to make a bunch of thumbnails -- for example.
This is sample output - yours may be different.
0

convert panorama_rainbow_2005.jpg -resize 40% panorama_rainbow_compress.jpg

pcardout · 2009-02-15 08:24:50 8
convert a .mp4 to a .avi
This is sample output - yours may be different.
0

ffmpeg -i "/path/to/file.mp4" "/path/to/file.avi"

smcpherson · 2009-03-27 04:36:41 6
Convert CSV files to TSV

Convert comma separated files to tab separated files. (MySQL eats tab separated files with much less instruction than comma seperated files.) Show Sample Output
This is sample output - yours may be different.
0

sed 's/,/\t/g' report.csv > report.tsv

viner · 2009-07-23 15:39:03 5
Remove lines matching a pattern in files (backup any modified files)
This is sample output - yours may be different.
0

pattern='regexp_pattern'; find . -type f -perm +220 ! -name '*.bak' -print0 | xargs -0 egrep -lZ $pattern | xargs -0 sed -i.bak -e "/$pattern/d"

yblusseau · 2010-03-11 13:10:15 2
Get Unique Hostnames from Apache Config Files

Get a list of all the unique hostnames from the apache configuration files. Handy to see what sites are running on a server.
This is sample output - yours may be different.
0

cat /etc/apache2/sites-enabled/* | egrep 'ServerAlias|ServerName' | tr -s " " | sed 's/^[ ]//g' | uniq | cut -d ' ' -f 2 | sed 's/www.//g' | sort | uniq

chronosMark · 2010-04-08 08:51:17 5
Generate list of words and their frequencies in a text file.
This is sample output - yours may be different.
0

tr A-Z a-z | tr -d 0-9\[\],\*-.?\:\"#\;\<\>\@ | tr ' /_' '\n' | sort | uniq -c

gcurious · 2010-10-19 17:21:05 3
Define Google Talk plugin urpmi media source for Mandriva/Mageia (works for both 32-bit and 64-bit systems)

This command adds a urpmi media source called "google-talkplugin" to the urpmi configuration on Mandriva or Mageia. Needs to be run as root. We specify the option "--update" so that when Google provides a newer version of Google Talk plugin in their download system then running a system update (eg: "urpmi --auto-update") will result in our copy of Google Talk plugin getting updated (along with any other Mandriva/Mageia pending updates). To install Google Talk plugin from this source, use: urpmi google-talkplugin # install plugin used for voice and video Google chat via gmail Show Sample Output
This is sample output - yours may be different.
```
[root@localhost mpb]#  urpmi.addmedia --update google-talkplugin http://dl.google.com/linux/talkplugin/rpm/stable/$(uname -m | sed -e "s/i.86/i386/")
adding medium "google-talkplugin"
    http://dl.google.com/linux/talkplugin/rpm/stable/i386/media_info/synthesis.hdlist.cz
```
0

urpmi.addmedia --update google-talkplugin http://dl.google.com/linux/talkplugin/rpm/stable/$(uname -m | sed -e "s/i.86/i386/")

mpb · 2011-04-30 23:01:36 3
Change time format in log, UNIX Timestamp to Human readable

It remove the square bracket and convert UNIX time to human readable time for all line of a stream (or file). Show Sample Output
This is sample output - yours may be different.
```
Input :
[1325199600] CURRENT SERVICE STATE: HOST01;Loopback;OK;HARD;1;Loopback0:UP:1 UP: OK
[1325199600] CURRENT SERVICE STATE: HOST01;Uptime Routers SFR;OK;HARD;1;Information only: 114 days

Ouput :
12/30/11 00:00:00 CURRENT SERVICE STATE: HOST01;Loopback;OK;HARD;1;Loopback0:UP:1 UP: OK
12/30/11 00:00:00 CURRENT SERVICE STATE: HOST01;Uptime Routers SFR;OK;HARD;1;Information only: 114 days
```
0

sed -r 's/(\[|])//g' | awk ' { $1=strftime("%D %T",$1); print }'

Zulu · 2012-02-03 13:07:37 4
Suspend to RAM with KDE 4

This uses the KDE suspend to ram.
This is sample output - yours may be different.
0

qdbus org.freedesktop.PowerManagement /org/kde/Solid/PowerManagement suspendToRam

Aissen · 2012-03-12 19:46:14 3
Generate a password for website authentication that can be recreated each time you need to authenticate without saving the password

Create a bash function for easy reference webPassword() { echo $1 $2 | md5sum | awk '{print substr($0,0,10)}' } alias webpwd=webPassword Use like this. webpwd www.commandlinefu.com MyPetNameHere Show Sample Output
This is sample output - yours may be different.
```
$ echo http://www.TheWebSiteName.com privatekeyword | md5sum | awk '{print substr($0,0,10)}'

3ac2dd2389
```
0

echo http://www.TheWebSiteName.com privatekeyword | md5sum | awk '{print substr($0,0,10)}'

ertjies · 2012-06-28 11:32:08 3
Cycle through all active screen sessions
This is sample output - yours may be different.
0

for s in /tmp/screens/S-$USER/*; do screen -r "$(basename "$s")"; done

dgbaley27 · 2012-08-23 16:16:54 5
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An easter egg built into python to give you the Zen of Python

display typedefs, structs, unions and functions provided by a header file

will display typedefs, structs, unions and functions declared in 'stdio.h'(checkout _IO_FILE structure). It will be helpful if we want to know what a particular header file will offer to us. Command 'cpp' is GNU's C Preprocessor.

Remove last line from files recursively

Used this command recently to remove the trailing ?> from all the files in a php project, which has having some unnecessary whitespace issues. Obviously, change *.php to whatever you'd like.

Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

Rename files in batch

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"

Bash logger

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

find out how many days since given date

You can also do this for seconds, minutes, hours, etc... Can't use dates before the epoch, though.

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

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