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regex to match an ip

This obey that you don't match any broadcast or network addresses and stay between 1.1.1.1 - 254.254.254.254
This is sample output - yours may be different.
0

echo 254.003.032.3 | grep -P '^((25[0-4]|2[0-4]\d|[01]?[\d]?[1-9])\.){3}(25[0-4]|2[0-4]\d|[01]?[\d]?[1-9])$'

foob4r · 2009-09-17 12:59:44 7
Find out my Linux distribution name and version
This is sample output - yours may be different.
0

cat /proc/version

unixmonkey13150 · 2010-10-20 15:56:10 5
Generate Random Passwords

just change 6 to 9 or 12 or more (multiple of 3) to have bigger password Show Sample Output
This is sample output - yours may be different.
```
# openssl rand 6 -base64
Wp5e+o3t
```
0

openssl rand 6 -base64

Le_Jax · 2011-10-05 14:24:41 3
pull only the temp sensor data off of a netapp

if you can use this depends on which netapp you have, this netapp is an FAS2020 Show Sample Output
This is sample output - yours may be different.
```
netapp temp: "<N/A>, 28C (82F), 29C (84F), 33C (91F)"
```
0

/usr/bin/snmpwalk -v 1 -c public 10.0.0.22 1.3.6.1.4.1.789.1.21.1.2.1.25.1| awk -F : '{print "netapp temp:" $4 }'

ndhail · 2011-11-10 01:04:00 4
Remove a range of lines from a file

Delete range of lines. Ex: Line 6 through 66 in .
This is sample output - yours may be different.
0

sed -i 6,66d <filename>

icsamples · 2012-02-04 02:29:40 3
Find and sort out folders by size
This is sample output - yours may be different.
0

du -s $(ls -l | grep '^d' | awk '{print $9}') | sort -nr

j3ffyang · 2012-03-15 09:04:13 3
Backup hidden files and folders in home directory

This will make a backup of all hidden files and folders in the home folder.
This is sample output - yours may be different.
0

tar zcpvf backup.tgz $(find $HOME -maxdepth 1 -name '.*' -and -not -name '.')

DavidAlfonso · 2012-05-01 17:48:24 19
Encrypt your file using RC4 encryption

At times you will need to safeguard your files. Use OpenSSL's native rc4 encryption to do so. 'nopad' removes padding and 'nosalt' removes random salt being added to the file.
This is sample output - yours may be different.
0

hashkey=`echo -ne <your-secret> | xxd -p`; openssl rc4 -e -nosalt -nopad -K $hashkey -in myfile.txt -out myfile.enc.txt

vishnu81 · 2012-10-31 12:17:44 6
Recursively unrar in different folders

In order to unrar several files in different subfolders, you just need to launch this command in your parent folder in order to have your files ready for manipulation and already extracted; I did not put anything to delete the original rar files
This is sample output - yours may be different.
0

for i in `ls` ; do cd $i ; pwd; for f in `ls *.rar` ; do unrar e $f ; done ; cd .. ; done

Avelinux · 2013-03-06 19:23:58 7
Use mplayer to save video streams to a file

1. Copy the url of the streaming video mms://etc... or http://... 2. Open up a terminal. 3. the command 4. Wait for the stream dump.
This is sample output - yours may be different.
0

mplayer -dumpstream -dumpfile stream_video_name url

pascalfares · 2013-12-13 18:28:16 6
Use a tar pipe to copy one directory to another, preserving file permissions.

This version uses subshells.
This is sample output - yours may be different.
0

(cd olddir && tar -cf - .)|(cd newdir && tar -xpf -)

lavidaportland · 2015-05-24 16:55:01 9
Rename selected files in the directory using ruby
This is sample output - yours may be different.
0

ruby -e 'Dir.glob("*.txt") { |f| File.rename(f,f.gsub("_t","")) }'

swarzynski · 2015-11-19 09:59:47 14
4chan image batch downloader

Replace thread_link with the link of the thread you want to download images of.
This is sample output - yours may be different.
0

wget thread_link -qO - | sed 's/\ /\n/g' | grep -e png -e jpg | grep href | sed 's/href\=\"/http:/g' | sed 's/"//g' | uniq | xargs wget

hztrance · 2016-07-16 20:43:33 12
Batch Remove git tags from remote server

We had a number of git tags named similarly to: 2016.12.13.devel.feature 2016.12.14.master.release But we have multiple developers making commits and tags for testing purposes. I wanted to reduce the number of tags that displayed on our cloud hosting server when doing a deployment.
This is sample output - yours may be different.
0

git ls-remote --tags origin | awk '/^(.*)(\s+)(.*)(YOUR-TAG-SPECIFIC-SEARCH-TERM-HERE)(.*)(-+)(.*)[^{}]$/ {print ":" $2}' | xargs git push origin

shanford · 2017-03-06 21:59:15 20
Get only headers from a website with curl even if it doesn't support HEAD

Some sites running on basic web servers don't support the HEAD request, so using "curl -I" on them doesn't work. This will automatically try "curl -I" at first and if that fails with a 4xx or 5xx status code, it falls back to "curl -i" and prints only the headers from that.
This is sample output - yours may be different.
0

curlh() { x="$(curl -Is -w '%{http_code}' "$@")"; if [[ "$(tail -n 1 <<< "$x")" == [45]* ]]; then curl -is "$@" | awk '{ if (!NF) { exit }; print }'; else head -n -1 <<< "$x"; fi; }

nyuszika7h · 2017-07-10 12:29:00 17
pc is ghosted?!

scare hell out of user of just amuse by playing random .wav short files
This is sample output - yours may be different.
0

while true; do locate *.wav | sed "{${RANDOM:1:2}q;d;}" | xargs aplay; sleep 10; done &> /dev/null &

dav23r · 2017-08-25 15:11:54 18
Continuous random string of text
This is sample output - yours may be different.
0

while true; do sleep .15; head /dev/urandom | tr -dc A-Za-z0-9; done

allyman17 · 2018-10-10 18:57:34 387
Show temp of all disk

Show temp of all disk with the drivetemp module activate Show Sample Output
This is sample output - yours may be different.
```
WDC WD5000AAKX-0(38°C)
ST500DM002-1BD14(34°C)
WDC WD5000AAKX-0(35°C)
WDC WD80EFZX-68U(37°C)
WDC WD40EFPX-68C(32°C)
WDC WD40EMAZ-51T(31°C)
ST3160811AS     (39°C)
WDC WD40EZRZ-00W(35°C)
SAMSUNG HD501LJ (33°C)
SAMSUNG HD501LJ (35°C)
SAMSUNG HD501LJ (35°C)
SAMSUNG HD501LJ (36°C)
ST3500620AS     (34°C)
ST500DM002-1BD14(35°C)
WDC WD5000AAKS-6(38°C)
```
0

grep -l "drivetemp" /sys/class/hwmon/hwmon*/name | while read f; do printf "%s(%-.2s°C)\n" "`<${f%/*}/device/model`" "`<${f%/*}/temp1_input`"; done

kokoparkletal · 2023-09-10 18:24:29 80
Flatten a RGBA image onto a white background.

Use graphicsmagick or imagemagick to composite a RGBA image over a flat white background and discard the alpha channel.
This is sample output - yours may be different.
0

composite -compose Over rgba.png -tile xc:white -geometry `identify rgba.png | sed 's/[^ ]* [^ ]* $[^ ]*$ .*/\1/g'` rgb-white.png

jimmac · 2009-02-15 19:53:45 8
get IPs with a DHCP lease

You can use that to create a excludefile for nmap, to find hosts, with no DHCP lease in your DHCP range. Show Sample Output
This is sample output - yours may be different.
```
192.168.0.73
192.168.0.99
192.168.0.38
192.168.0.77
192.168.0.98
192.168.0.46
192.168.0.13
```
0

egrep "^lease" /var/lib/dhcp/db/dhcpd.leases |awk '{ print $2 }'

peshay · 2009-08-14 07:31:00 3
Step#1 Compare the disk spaces first!

Compare the disk space for the new and old drive
This is sample output - yours may be different.
0

blockdev --getsize64 /dev/sd[ab]

bbelt16ag · 2011-01-08 11:25:54 3
create file

enter our information on the content file. Show Sample Output
This is sample output - yours may be different.
```
empty
```
0

FILE=$(tempfile 2>/dev/null || echo .$RANDOM)

s123iva · 2011-08-31 10:39:11 3
Multiple Perl Search/Replace from a file

with a semicolon text file map, apply multiple replace to a single file Show Sample Output
This is sample output - yours may be different.
```
$ cat table-mv.txt
WCFAppRoles;AsAppRoles
WCFDBError;AsDBErrors
WCFFunctions;AsFunctions


$ cat table-mv.txt | perl -pe 's{([^;]+);([^;]+)}{tbl$1/tbl$2}' | perl -pe 's{(\S+)}{perl -i -pe #s/$1/g# xxx.sql}' |  tr "#" "\'"


perl -i -pe 's/tblWCFAppRoles/tblAsAppRoles/g' xxx.sql
perl -i -pe 's/tblWCFDBError/tblAsDBErrors/g' xxx.sql
perl -i -pe 's/tblWCFFunctions/tblAsFunctions/g' xxx.sql
```
0

cat table-mv.txt | perl -pe 's{([^;]+);([^;]+)}{tbl$1/tbl$2}' | perl -pe 's{(\S+)}{perl -i -pe #s/$1/g# xxx.sql}' | tr "#" "\'" | bash

hute37 · 2011-10-05 15:55:34 4
Add a custom package repository to apt sources.list

">>" appends to the file ">" replaces the entire file make sure to use ">>" Show Sample Output
This is sample output - yours may be different.
```
none
```
0

sudo echo "package url" >> /etc/apt/sources.list

Gunni · 2012-05-01 21:32:51 4
Instant threadpool
This is sample output - yours may be different.
0

cat item_list | xargs -n1 -P<n> process_item

sanchan89 · 2013-03-06 20:25:17 31
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Insert commas to make reading numbers easier in the output of ls

This modifies the output of ls so that the file size has commas every three digits. It makes room for the commas by destructively eating any characters to the left of the size, which is probably okay since that's just the "group". Note that I did not write this, I merely cleaned it up and shortened it with extended regular expressions. The original shell script, entitled "sl", came with this description: : ' : For tired eyes (sigh), do an ls -lF plus whatever other flags you give : but expand the file size with commas every 3 digits. Really helps me : distinguish megabytes from hundreds of kbytes... : : Corey Satten, corey@cac.washington.edu, 11/8/89 : ' Of course, some may suggest that fancy new "human friendly" options, like "ls -Shrl", have made Corey's script obsolete. They are probably right. Yet, at times, still I find it handy. The new-fangled "human-readable" numbers can be annoying when I have to glance at the letter at the end to figure out what order of magnitude is even being talked about. (There's a big difference between 386M and 386P!). But with this nifty script, the number itself acts like a histogram, a quick visual indicator of "bigness" for tired eyes. :-)

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"

Quickly generate an MD5 hash for a text string using OpenSSL

find available cpu frequencies on FreeBSD

Once you know the available frequencies for your CPU, they can be used to do things like set minimum CPU frequency for powerd so that it doesn't ramp down too slow on a server : /etc/sysctl.conf or /boot/loader.conf: debug.cpufreq.lowest=DESIRED FREQ HERE or at terminal sysctl debug.cpufreq.lowest=DESIRED FREQ HERE

Clear terminal Screen

Probably the quickest / easiest way to clear the screen.

log your PC's motherboard and CPU temperature along with the current date

Uses the data in the /proc system, provided by the acpid, to find out the CPU temperature. Can be run on systems without lm-sensors installed as well.

Email an svn dump

Dumps a compressed svn backup to a file, and emails the files along with any messages as the body of the email

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"

pretend to be busy in office to enjoy a cup of coffee

Print Memory Utilization Percentage For a specific process and it's children

Change the name of the process and what is echoed to suit your needs. The brackets around the h in the grep statement cause grep to skip over "grep httpd", it is the equivalent of grep -v grep although more elegant.

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