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delete at start of each line until character

GNU grep's PCRE(Perl-compatible regular expressions).
This is sample output - yours may be different.
1

grep -Po '^(.*?:\K)?.*'

metropolis · 2019-08-21 01:34:17 0
delete at start of each line until character

Delete the beginning of each line until first match of given character, in this case it's ":" Does it on all lines. The given character is deleted also, and can be a space.
This is sample output - yours may be different.
0

sed 's/^[^:]*://g'

bugmenot · 2019-08-21 01:02:56 0
Convert & rename all filenames to lower case
This is sample output - yours may be different.
1

convmv --lower --notest FILE

malathion · 2019-08-20 05:28:08 0
Get CPU thermal data on MacOS
This is sample output - yours may be different.
2

sysctl machdep.xcpm.cpu_thermal_level

malathion · 2019-08-19 21:15:07 0
SSH connection through host in the middle
This is sample output - yours may be different.
8

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.
1

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%
```
0

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.
12

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

metropolis · 2019-08-07 14:03:30 1
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
```
-2

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
Access folder "-"

If you try to access cd - you go to the last folder you were in.
This is sample output - yours may be different.
4

cd -- -

ismabsd · 2019-08-02 07:20:29 2
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 0
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.
1

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
```
-1

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.
1

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.
4

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.
3

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.
-1

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.
1

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

forouharid · 2019-07-27 21:04:27 0
Open browser from terminal to create PR after pushing something in Git in MAC
This is sample output - yours may be different.
1

git remote -v |grep origin|tail -1|awk '{print $2}'|cut -d"@" -f2|sed 's/:/\//g'|xargs -I {} open -a "Google Chrome" https://{}

supratim · 2019-07-26 18:15:11 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
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Jump to a song in your XMMS2 playlist, based on song title/artist

Usage: Declare this function in your Shell, then use it like this: $> jumpTo foo The script will search for the 'foo' pattern in your current xmms2 playlist (artist or songname), and play the first occurence of it !

To find which host made maximum number of specific tcp connections

This command is primarily going to work on linux boxes. and needs to be changed, for example IP=10\.194\.194\.2 PORT=389

Uptime in minute

convert wav files to ogg

cd to the folder containing the wav files and convert them all to ogg format. in my sample output i use the -a and -l flags to set the author and album title. to get the oggenc program in ubuntu linux run: sudo apt-get install oggenc

Remove all old kernels

http://askubuntu.com/questions/89710/how-do-i-free-up-more-space-in-boot

Quick HTML image gallery from folder contents with Perl

This includes a title attribute so you can see the file name by hovering over an image. Also will hoover up any image format - jpg, gif and png.

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"

search for files or directories, then show a sorted list of just the unique directories where the matches occur

Ever use 'locate' to find a common phrase in a filename or directory name? Often you'll get a huge list of matches, many of which are redundant, and typically the results are not sorted. This command will 'locate' your search phrase, then show you a sorted list of just the relevant directories, with no duplications. So, for example, maybe you have installed several versions of the java jre and you want to track down every directory where files matching "java" might exist. Well, a 'locate java' is likely to return a huge list with many repeated directories since many files in one directory could contain the phrase "java". This command will whittle down the results to a minimal list of unique directory names where your search phrase finds a match.

vim read stdin

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" }

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