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Chronometer

Chronometer using the bc calculator. Show Sample Output
This is sample output - yours may be different.
```
0
1
2
3
4
5
...
```
0

NUM=-1; while NUM=`echo $NUM + 1 | bc`; do echo $NUM && sleep 1; done

tomivs · 2014-06-07 20:48:45 9
Edit hosts file to remove "foo.novalocal" from it where foo is the hostname of a new VM

When booting a VM through OpenStack and managed through cloudinit, the hosts file gets to write a line simiar to 127.0.1.1 ns0.novalocal ns0 This command proven useful while installing a configuration manager such as Salt Stack (or Puppet, or Ansible) and getting node name
This is sample output - yours may be different.
0

sed -e "s/^127.0.1.1 $(hostname).novalocal/127.0.1.1/g" /etc/hosts

renoirb · 2014-09-25 15:38:43 12
Get the number of commits in a git repository

The command outputs the number of commits made to a git repository be leveraging the git-log git command and the wc command that ships with linux coreutil Show Sample Output
This is sample output - yours may be different.
```
200
```
0

git log --pretty=oneline | wc -l

lym · 2015-09-25 19:47:26 7
OS X application launcher with fuzzy search

Brings ups fzf with a list of Applications, then opens the selection. Requires fzf: https://github.com/junegunn/fzf
This is sample output - yours may be different.
0

find /Applications -name "*.app" -maxdepth 2 | fzf --exit-0 | open

ratberryjam · 2015-10-31 19:02:30 13
Shell to discover MTU using ping

Changelog: Changing ping to "ping -A -c1 -w10" - targeting a quick and reliable ping, even on slow networks.
This is sample output - yours may be different.
0

ADDR=127.0.0.1 ; for i in `seq 1300 1501`; do echo -ne "Pacote de tamanho $i bytes" ; ping -A -c1 -w10 -s $i -Mdo $ADDR 2>&1 > /dev/null || break ; echo -ne "\r\033[2K" ; done ; echo -ne "\r\033[2K" ; echo -e "MTU bem sucedido com `expr $i`"

pqatsi · 2015-12-18 18:11:47 11
Convert libreoffice files : .odt .odg and other to .pdf

Find and Convert all libre office files to PDF without libreoffice GUI Show Sample Output
This is sample output - yours may be different.
```
convert /home/foo/Documents/test.odt -> /home/foo/Documents/test.pdf using filter : writer_pdf_Export
```
0

find /home/foo/Documents/ -type f -iname "*.odt" -exec libreoffice --headless --convert-to pdf '{}' \;

switch · 2018-08-29 21:44:26 329
Get ethX mac addresses

Simple MAC adrress, thanks to ifconfig.
This is sample output - yours may be different.
0

ifconfig | awk '/HW/ {print $5}'

Cont3mpo · 2009-11-05 18:00:50 4
simple echo of IPv4 IP addresses assigned to a machine

ifconfig is dead, long-live iproute2 this also uses only awk to do the grepping and removal of CIDR notation Show Sample Output
This is sample output - yours may be different.
```
127.0.0.1
10.3.0.43
```
0

ip addr | awk '/inet / {sub(/\/.*/, "", $2); print $2}'

markdrago · 2010-03-04 14:21:18 6
Reload an open file in emacs

If you have file opened in emacs and was just changed, the fastest way to reload the file is C-x C-v, as its default value is the path of the file.
This is sample output - yours may be different.
0

C-x C-v, Enter

unixmonkey9173 · 2010-04-04 16:06:34 3
Geolocate a given IP address

Grabs the ip2location site and removes everything but the span tag containing the country value. Place it inside your .bashrc or .bash_aliases file. Show Sample Output
This is sample output - yours may be different.
```
$ ip2loc 167.4.1.41
UNITED STATES
```
0

ip2loc() { wget -qO - www.ip2location.com/$1 | grep "<span id=\"dgLookup__ctl2_lblICountry\">" | sed 's/<[^>]*>//g; s/^[\t]*//; s/"/"/g; s/</</g; s/>/>/g; s/&/\&/g'; }

bkuri · 2010-10-13 00:19:35 4
Backup a file with a date-time stamp

even shorter (infix) version. Show Sample Output
This is sample output - yours may be different.
```
$ buf() { cp -v $1 ${1/${1%%.*}/$f-$(date +"%Y%m%d_%H%M%S")};}
$ buf a.txt
`a.txt' -> `a-20101215_131256.txt'
$ buf a.txt.gz
`a.txt.gz' -> `a-20101215_131305.txt.gz'
```
0

buf() { cp -v $1 ${1/${1%%.*}/$f-$(date +"%Y%m%d_%H%M%S")};}

unefunge · 2010-12-15 12:16:03 3
Run previous same command in history
This is sample output - yours may be different.
0

<comand> && !<command>

savageblood · 2011-06-07 12:37:40 4
delete the files from the given directory except the PDF file
This is sample output - yours may be different.
0

ls -1 $PATH*/* | xargs file | awk -F":" '!($2~/PDF document/){print $1}' |xargs rm -rf

karuppasamy · 2011-11-02 04:42:32 3

Check a port's state on a given host

Check to see if a port is open or closed on a given host. Show Sample Output

checkport() { sudo nmap -sS -p $1 $2 }

peterRepeater · 2011-12-13 11:46:15 7

space to underscore across single directory

and that was the only thing that worked for me.
This is sample output - yours may be different.
0

rename ' ' '_' *

toadsted · 2012-01-28 21:31:08 3
Get all links of a website
This is sample output - yours may be different.
0

lynx -dump http://www.domain.com | awk '/http/{print $2}' | egrep "^https{0,1}"

khaled_eng15 · 2012-04-23 10:41:02 3
detect partitions
This is sample output - yours may be different.
0

sudo file -bs /dev/sda | sed -e 's/.*partition 1$.*$ code offset.*/partition 1\1/g' -e 's/$.$;/\1\n/g'

jlaunay · 2012-08-17 12:54:05 5
List prime numbers from 2 to 100
This is sample output - yours may be different.
0

seq 2 100 | factor | sed '/ .* / d ; s/:.*//'

misof · 2012-10-25 15:19:35 4

investigates the network connection between the host and google public dns server

As mtr starts, it investigates the network connection between the host and google public dns server. Show Sample Output

mtr -t -o "LSD NBAW" 8.8.8.8

koppi · 2013-04-15 22:28:09 6

Replace all the spaces in all the filenames of the current directory and including directories with underscores.

The above command will also rename hidden files or dirs
This is sample output - yours may be different.
0

rename "s/ /_/g" * .*

jld · 2013-06-22 15:56:41 7
Opens an explorer.exe file browser window for the current working directory or specified dir (Fixed)

What's wrong with this? Show Sample Output
This is sample output - yours may be different.
```
[1] 4076
```
0

explorer . &

rmsh · 2014-06-08 10:16:04 8
Extract android adb backup to tar format (only works for non encrypted backups)

in case your openssl does not have zlib support: openssl:Error: 'zlib' is an invalid command.
This is sample output - yours may be different.
0

dd if=backup.ab bs=24 skip=1 | zlib-flate -uncompress > backup.tar

unixmonkey86504 · 2015-01-12 12:55:16 8
Get all shellcode on binary file from objdump
This is sample output - yours may be different.
0

echo "\"$(objdump -d BINARY | grep '[0-9a-f]:' | cut -d$'\t' -f2 | grep -v 'file' | tr -d " \n" | sed 's/../\\x&/g')\""

reiderroque · 2015-09-25 20:21:26 11
Find out the Firefox bookmarks that have "string" in their note (aka 'description')

1. First we get the `item_id` for that `comment`. Adapt the -C[N] parameter for your use. 2. Then we show the bookmark's `title` (or `url`). With that in your hand it's a matter of seconds to open Firefox's library and find the bookmark. Handy for eg. forensics or better sanitize of a place.sqlite before sharing it (on the cloud). It sure has room for improvement. Show Sample Output
This is sample output - yours may be different.
```
blablablabla
bleble string    ?-- string looked for
blobloblo|10611  ?-- item_id

Bookmark's title
```
0

sqlite3 -list places.sqlite 'SELECT item_id, content FROM moz_items_annos ;' | grep -A9 "string" ; sqlite3 places.sqlite 'SELECT title FROM moz_bookmarks WHERE .fk = <item_id number> ;'

datruche · 2015-10-31 19:32:52 13
Simple list of apache2 virtualhosts

Simply shows virtualhosts enabled, root access not needed (assuming apache2ctl is non-root executable).
This is sample output - yours may be different.
0

/usr/sbin/apache2ctl -S

lingo · 2009-07-21 10:52:49 4
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Check to make sure the whois nameservers match the nameserver records from the nameservers themselves

Change the $domain variable to whichever domain you wish to query. Works with the majority of whois info; for some that won't, you may have to compromise: domain=google.com; for a in $(whois $domain | grep "Domain servers in listed order:" --after 3 | grep -v "Domain servers in listed order:"); do echo ">>> Nameservers for $domain from $a

Grab the first 3 octets of your ip addresses

For machines that have many ip blocks spanning different Class C's, this will show which ones.

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

extract element of xml

Prints the value of a XML node rather than the entire node.

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

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"

Rename files in batch

Command to Show a List of Special Characters for bash prompt (PS1)

I use this command (PS1) to show a list bash prompt's special characters. I tested it against A flavor of Red Hat Linux and Mac OS X

Multiple variable assignments from command output in BASH

This version uses read instead of eval.

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