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SSH connection through host in the middle
This is sample output - yours may be different.
1

ssh -J user@reachable_host user@unreacheable_host

renich · 2019-08-14 17:29:45 0

Find all clients connected to HTTP or HTTPS ports

It finds, specifically, the connections to the HTTP and HTTPS ports as source ports. You can check for destination ports as well. Show Sample Output

ss -o state established '( dport = :http or sport = :https )'

renich · 2019-08-14 17:28:13 0

Check whether laptop is running on battery or cable

1 = on ac, 0 = on bat
This is sample output - yours may be different.
0

cat /sys/class/power_supply/AC/online

wuziduzi · 2019-08-13 21:31:00 0
Check whether laptop is running on battery or cable

Just an alternative for `acpi -b` Show Sample Output
This is sample output - yours may be different.
```
Discharging 46%
```
1

eval "$(printf "echo %s \$((%i * 100 / %i))\n" $(cat $(find /sys -name energy_now 2>/dev/null | head -1 | xargs dirname)/{status,energy_{now,full}}))%"

glaudiston · 2019-08-10 16:50:12 0
Using a single sudo to run multiple && arguments

Bash's here string
This is sample output - yours may be different.
4

sudo -s <<< 'apt update -y && apt upgrade -y'

metropolis · 2019-08-07 14:03:30 0
jump to home dir and list all, not older than 3 days, with full-path, hidden/non-hidden files/subdirectories

Number of days back: change/append arbitrary amount of '\|'$[$(date +%Y%j)-x] expressions or specify any n-th day before today for a single day (you have to replace x with 3, 4, 5, whatever ... above I replaced it with 1 and 2 to get listing for yesterday and day before yesterday and 0 for today was not necessary, so left out). Q: How to narrow to *.pdf , *.png, *.jpg, *.txt, *.doc, *.sh or any type of files only? A: Pipe to grep at the end of command. Even shorter: cd && day=3;for a in $(seq $day -1 0);do tree -aicfnF --timefmt %Y%j-%d-%b-%y|grep $[$(date +%Y%j)-$a];done Here it's only needed to change amount of variable day to list period of days back - here is set to three days back (the seq command is adjusted for listing the oldest stuff first). Show Sample Output
This is sample output - yours may be different.
```
[2019215-03-Aug-19]  ./.config/session/
[2019215-03-Aug-19]  ./.config/session/konsole_2b5b0f704-9942-428b-a3d8-8054efd32b18_1564837706_57870
[2019215-03-Aug-19]  ./.config/session/konsole_23e1f9567-a8ff-42ad-a879-76f7bafb56c3_1564840981_89854
[2019215-03-Aug-19]  ./.config/session/konsole_2e2aea661-fd41-4510-b0b9-1d2c69ef99c7_1564864156_611707
[2019215-03-Aug-19]  ./.config/konsolerc
[2019216-04-Aug-19]  ./.config/dconf/
[2019216-04-Aug-19]  ./.config/dconf/user
[2019216-04-Aug-19]  ./.config/briši_me.pdf
```
0

cd && tree -aicfnF --timefmt %Y%j-%d-%b-%y|grep $(date +%Y%j)'\|'$[$(date +%Y%j)-1]'\|'$[$(date +%Y%j)-2]

knoppix5 · 2019-08-04 02:22:24 0
Remove abstracts from a bibtex file

Remove lines from a bibtex file that have abstracts in them.
This is sample output - yours may be different.
0

sed '/^\s*abstract\s*=\s*{[^\n]*},$/ d' input.bib > output.bib

mirams · 2019-08-01 13:59:38 1
Using a single sudo to run multiple && arguments

This will also work with bash instead of sh shell sudo bash -c 'apt update -y && apt upgrade -y'
This is sample output - yours may be different.
0

sudo sh -c 'apt update -y && apt upgrade -y'

ioshield · 2019-07-31 04:39:40 0
shell bash iterate number range with for loop

"seq" has an additional parameter to use as INCREMENT. # seq FIRST INCREMENT LAST https://linux.die.net/man/1/seq Show Sample Output
This is sample output - yours may be different.
```
1
2
3
4
5
```
0

for i in $(seq 1 5) ; do echo $i ; done

guilsson · 2019-07-29 18:34:12 0
shell bash iterate number range with for loop
This is sample output - yours may be different.
0

seq 10 20

Thierry · 2019-07-28 21:47:07 0
Faciliate the work for lftp ('all' is needed if you wanna use it with getopts, otherwise its enough with the lftp line)

Add this to a script and you can do ./scriptname site help or ./scriptname mput etc etc.
This is sample output - yours may be different.
0

all="$(echo -e $*|awk '{for(i=3;i<=NF;++i)print $i}'|xargs)"; lftp -e open <HOSTNAME> -p <PORT> -u <USER>:<PASSWORD> -e "$all;exit"

wuziduzi · 2019-07-28 18:48:28 0
Block all brute force attacks in realtime (IPv4/SSH)

Was to long with a loop, use a while loop for have it running 24/7
This is sample output - yours may be different.
0

inotifywait -r -q --format %w /var/log/auth.log|grep -i "Failed pass"|tail -n 1|grep -oE '\b([0-9]{1,3}\.){3}[0-9]{1,3}';iptables -I INPUT -i eth0 -s "$(cat /var/log/auth.log|grep "authentication failure; l"|awk -Frhost= '{print $2}'|tail -n 1)" -j DROP

wuziduzi · 2019-07-28 18:42:23 1
Block all IPv4 addresses that has brute forcing our ssh server

For ipv6 use: grep -oE "\b([0-9A-Fa-f]{1,4}:){7}[0-9A-Fa-f]{1,4}\b"
This is sample output - yours may be different.
0

for idiots in "$(cat /var/log/auth.log|grep invalid| grep -oE '\b([0-9]{1,3}\.){3}[0-9]{1,3}\b')"; do iptables -A INPUT -s "$idiots" -j DROP; done

wuziduzi · 2019-07-28 18:29:14 1
shell bash iterate number range with for loop

Bash's arithmetic evaluation.
This is sample output - yours may be different.
1

for((i=1;i<=10;i++)){ echo $i; }

metropolis · 2019-07-28 02:32:09 0
shell bash iterate number range with for loop
This is sample output - yours may be different.
1

for i in {1..10}; do echo $i; done

bakhru · 2019-07-28 01:09:35 0
Which processes are listening on a specific port (e.g. port 80)
This is sample output - yours may be different.
0

netstat -nap|grep 80|grep LISTEN

bakhru · 2019-07-28 01:08:45 0
shell bash iterate number range with for loop
This is sample output - yours may be different.
0

rangeBegin=10; rangeEnd=20; for ((numbers=rangeBegin; numbers<=rangeEnd; numbers++)); do echo $numbers; done

forouharid · 2019-07-27 21:04:27 0
shell bash iterate number range with for loop

iterating range of numer with for loop in shell or bash Show Sample Output
This is sample output - yours may be different.
```
10
11
12
13
14
15
16
17
18
19
20
```
-1

rangeBegin=10; rangeEnd=20; for numbers in $(eval echo "{$rangeBegin..$rangeEnd}"); do echo $numbers;done

aysadk · 2019-07-26 09:19:44 1
bash test check validate if variable is number

to test check if given variable is a digit / number Show Sample Output
This is sample output - yours may be different.
```
error: Not a number
```
1

varNUM=12345; re='^[0-9]+$'; if ! [[ $varNUM =~ $re ]] ; then echo "error: Not a number"; fi

aysadk · 2019-07-26 09:15:37 1
iso to USB with dd and show progress status

Does the same but shows nicely progress in real time with correct Size in %. But also needs the packages sudo,dd,pv and dialog.
This is sample output - yours may be different.
0

image="file.iso";drive="/dev/null";sudo -- sh -c 'cat '"${image}"'|(pv -n -s $(stat --printf="%s" '"${image}"')|dd of='"${drive}"' obs=1M oflag=direct) 2>&1| dialog --gauge "Writing Image '"${image}"' to Drive '"${drive}"'" 10 70 7'

fries · 2019-07-25 11:11:45 0
Stage all files for commit except those that are *.config at any level within your git repo [Windows]
This is sample output - yours may be different.
0

git status | Where-Object {$_.Contains('modified') -and !$_.Contains('.config')} | ForEach-Object { git add $_.Replace('modified:','').Trim() }

RaphHaddad · 2019-07-22 06:25:45 0
Delete all local branches that have been merged into master [Windows]
This is sample output - yours may be different.
-1

git branch --merged origin/master | Where-Object { !$_.Contains('master') } | ForEach-Object { git branch -d $_.trim() }

RaphHaddad · 2019-07-22 06:24:55 0
Initialise git in working directory with latest Visual Studio .gitignore [Windows]
This is sample output - yours may be different.
-1

git init; (Invoke-WebRequest https://raw.githubusercontent.com/github/gitignore/master/VisualStudio.gitignore -UseBasicParsing).Content | Out-File -FilePath .gitignore -Encoding utf8; git add -A

RaphHaddad · 2019-07-22 06:24:33 0
Line Separator That is Width of Terminal

Creates a line seperator that will be the width of your window. Show Sample Output
This is sample output - yours may be different.
```
???? CL test                                                                                         
============================================== test ==============================================
```
1

CL () { WORDS=$@; termwidth="$(tput cols)"; padding="$(printf '%0.1s' ={1..500})"; printf '%*.*s %s %*.*s\n' 0 "$(((termwidth-2-${#WORDS})/2))" "$padding" "$WORDS" 0 "$(((termwidth-1-${#WORDS})/2))" "$padding"; }

Sabz69 · 2019-07-20 20:39:10 2
pretty print json block that has quotes escaped
This is sample output - yours may be different.
0

echo 'json_here' | sed 's/\\//g' | jq .

jgleeson · 2019-07-19 16:26:48 0
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Stop Flash from tracking everything you do.

Brute force way to block all LSO cookies on a Linux system with the non-free Flash browser plugin. Works just fine for my needs. Enjoy.

Fetch the current human population of Earth

Fetches the world population JSON data from the US census and parses it uses jshon

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"

Find the package that installed a command

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"

Find out how old a web page is

I is for headers only s is for silence curl -Is outputs ONLY headers the pipe and grep is to filter them to Modified only..

List out classes in of all htmls in directory

Lists out all classes used in all *.html files in the currect directory. usefull for checking if you have left out any style definitions, or accidentally given a different name than you intended. ( I have an ugly habit of accidentally substituting camelCase instead of using under_scores: i would name soemthing counterBox instead of counter_box) WARNING: assumes you give classnames in between double quotes, and that you apply only one class per element.

Show this month's calendar, with today's date highlighted

Explanation: * The date command evaluated to today's date with blank padded on the left if single digit * The grep command search and highlight today's date * The --before-context and --after-context flags displays up to 6 lines before and after the line containing today's date; thus completes the calendar. I have tested this command on Mac OS X Leopard and Xubuntu 8.10

[WinXP]Use as a shortcut in the SendTo menu to open a cmd window for a given folder.

This comes in handy for me when I am developing and testing Perl command line scripts. http://technet.microsoft.com/en-us/library/bb490880.aspx

RTFM function

Some commands have more information on 'info' than in the man pages

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