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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 () { [email protected]; 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 3
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 1
Download certificate chain from FTP
This is sample output - yours may be different.
0

echo | openssl s_client -showcerts -connect ftp.domain.com:ftp -starttls ftp 2>/dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p'

Raboo · 2019-07-19 12:30:48 2
Download certificate from FTP
This is sample output - yours may be different.
0

echo | openssl s_client -servername ftp.domain.com -connect ftp.domain.com:21 -starttls ftp 2>/dev/null | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p'

Raboo · 2019-07-19 12:30:19 2
Create backup copy of file, adding suffix of the date of the file modification (NOT today's date)

When I go to change a configuration file I always like to make a backup first. You can use "cp -p" to preserve the modification time, but it gets confusing to have file.prev, file.prev2, etc. So I like to add a YYMMDD suffix that shows when the file was last changed. "stat -c %Y" gives you the modification time in epoch seconds, then "date -d @" converts that to whatever format you specify in your "+format" string. Show Sample Output
This is sample output - yours may be different.
```
# ls -l
-rw-r--r-- 1 root root 0 Dec 31  2018 file
# cp -p file file.$(date -d @$(stat -c '%Y' file) "+%y%m%d")
 ls -l
-rw-r--r-- 1 root root 0 Dec 31  2018 file
-rw-r--r-- 1 root root 0 Dec 31  2018 file.181231
 
```
3

cp file file.$(date -d @$(stat -c '%Y' file) "+%y%m%d")

dmmst19 · 2019-07-18 18:09:09 0
Bash function that saves bash functions to file from shell session

The simpler, 1-arg version is save_function(){ { date +"# %F.%T $1; declare -f "$1";}| tee -a ~/.bash_functions; }` Show Sample Output
This is sample output - yours may be different.
```
$ save_function save_function
# 2019-07-16.18:03:57 save_function
save_function ()
{
    while [[ $# > 0 ]]; do
        {
            date +"# %F.%T $1";
            declare -f "$1"
        } | tee -a ~/.bash_functions;
        shift;
    done
}
```
2

save_function(){ while [[ $# > 0 ]]; do { date +"# %F.%T $1; declare -f "$1";}| tee -a ~/.bash_functions; shift; done;}

mcint · 2019-07-17 01:06:59 0
Trim disk image for best compression before distributing

fstrim is usually used on SSDs but can also be used to remove useless bits from file system images. This is most helpful if the compressed disk image is intended to be distributed, since it will be smaller than an untrimmed compressed image. Show Sample Output
This is sample output - yours may be different.
```
disk/: 1.1 GiB (1185869824 bytes) trimmed
```
0

kpartx -av disk.img && mkdir disk && mount /dev/mapper/loop0p1 disk && fstrim -v disk && umount disk && kpartx -d disk.img

stinkerweed999 · 2019-07-16 23:54:13 0
Manually trim SSD

Trims left over file system data from SSD. This can be set as a mount option, but then IO performance decreases. I prefer to trim in a batch either on boot or every few weeks. Show Sample Output
This is sample output - yours may be different.
```
/: 372 GiB (399476387840 bytes) trimmed
```
0

sudo fstrim -v /

stinkerweed999 · 2019-07-16 23:41:56 2
Watch TCP, UDP open ports in real time with socket summary.
This is sample output - yours may be different.
2

watch ss -stplu

wuziduzi · 2019-07-16 20:41:36 0
Debug pytest failures in the terminal

pudb is an ncurses debugger. This command will allow interactive debugging of test failures in pytest using pudb.
This is sample output - yours may be different.
1

pytest --pdbcls pudb.debugger:Debugger --pdb --capture=no

malathion · 2019-07-14 02:54:59 0
generate random mac-address using md5sum + sed

Show Sample Output
This is sample output - yours may be different.
```
$ date | md5sum | sed -r 's/(..){3}/\1:/g;s/\s+-$//'
78:3a:dc:2a:9c:df
```
1

date | md5sum | sed -r 's/(..){3}/\1:/g;s/\s+-$//'

acavagni · 2019-07-13 10:39:21 0
Visual alert with keyboard LEDs
This is sample output - yours may be different.
0

for a in $(seq 16); do xdotool key Num_Lock;sleep .5; xdotool key Caps_Lock;done

knoppix5 · 2019-07-11 23:47:20 1
draw line separator (using knoppix5 idea)

No need to fork off a process.
This is sample output - yours may be different.
0

printf "%.s*" {1..40}; printf "\n"

doododoltala · 2019-07-11 00:27:20 0
Find Apache Root document

WRT the original solution: 1. I might be wrong, but it seems DocumentRoot (per Apache docs) should be spelled exactly as is, as it is case-sensitive. So using -i will return strings such as documentroot, DOCUMENTROOT,.... (which could been added as part of a comment) 2. It returns false results for such cases as DocumentRoot is embedded in a comment 3. It returns false results for such cases as OldDocumentRoot, DocumentRoot.sav, ... in a comment. Other notes: - FYI: There might be more than one valid DocumentRoot entry in the conf file (in case of using virtual host(s))
This is sample output - yours may be different.
0

grep -e '^[[:blank:]]*DocumentRoot[[:blank:]]\S'

doododoltala · 2019-07-10 23:12:08 0
KDE Console Logout command (with confirmation dialog)

Can be used to log out of an acrive user session when using KDE. This version will ask for confirmation with a 30 second timeout. The parameters at the end can be changed to suit your needs; The first determines if there is a confirmation dialog or not, the second determines what exactly the action taken is. The third is "when", I don't really use any other value than 0 for this. Param 1: - 0 => Do not wait for confirmation - 1 -> Wait for confirmation (30s timeout) Param 2: -1 = > Prompt for action to take, defaults to shutdown - 0 => logout - 1 => Restart - 2 => Shutdown I alias these to; alias logout="qdbus org.kde.ksmserver /KSMServer logout 1 0 0" alias logoutnow="qdbus org.kde.ksmserver /KSMServer logout 0 0 0" and so forth.
This is sample output - yours may be different.
0

$ qdbus org.kde.ksmserver /KSMServer logout 1 0 0

Undomyr · 2019-07-10 22:45:16 0
Set a user password without passwd

Slightly shorter. It doesn't create a subprocess either.
This is sample output - yours may be different.
0

chpasswd <<< "user:newpassword"

doododoltala · 2019-07-10 17:12:17 0
Listing today’s files only
This is sample output - yours may be different.
3

find directory_path -maxdepth 1 -daystart -mtime -1

doododoltala · 2019-07-10 00:17:59 0
find all files that have 20 or more MB on every filesystem, change the size and filesystem to your liking

find all files that have 20 or more MB on every filesystem, change the size and filesystem to your liking
This is sample output - yours may be different.
0

find / -type f -size +20000k -exec ls -lh {} \; 2> /dev/null | awk '{ print $NF ": " $5 }' | sort -nrk 2,2

Marius · 2019-07-08 21:04:09 0
Listing today’s files only
This is sample output - yours may be different.
6

ls -al --time-style=+%D| grep `date +%D`

wuziduzi · 2019-07-07 00:29:04 0
Set a user password without passwd
This is sample output - yours may be different.
0

echo 'user:newpassword' | chpasswd

wuziduzi · 2019-07-06 23:58:47 0
shuffle lines via bash

Using perl in a one-liner is a bit overkill to randomly sort some input. `sort` from coreutils should be enough.
This is sample output - yours may be different.
0

seq 1 9 | sort -R

chtk · 2019-07-05 18:36:49 1
This will allow you to browse web sites using "-dump" with elinks while you still are logged in

README: This require you to login on facebook with elinks without using '-dump' first time and when you have logged in you will then be able to dump all data from facebook without any advanced combos, dump is all you need for see all your friends newsfeed or whatever you wish to view in cli/terminal. Facebook is just an example, same requirements for all websites that have a login form.
This is sample output - yours may be different.
1

sed -i 's/show_formhist = 1/show_formhist = 0/;s/confirm_submit = 0/confirm_submit = 1/g' /etc/elinks/elinks.conf; elinks -dump https://facebook.com

wuziduzi · 2019-07-04 15:04:07 2
Decrypt passwords from Google Chrome and Chromium.

Read this before you down voting and comment that it is not working -> Wont work on latest versions ~75> since database file is locked and has to be decrypted. This is useful if you have an old hdd with a chrome installation and want to decrypt your old passwords fast.
This is sample output - yours may be different.
2

sqlite3 -header -csv -separator "," ~/.config/google-chrome/Default/Login\ Data "SELECT * FROM logins" > ~/Passwords.csv

wuziduzi · 2019-07-04 14:38:52 0
Find passwords that has been stored as plain text in NetworkManager
This is sample output - yours may be different.
1

grep -H '^psk=' /etc/NetworkManager/system-connections/*

wuziduzi · 2019-07-04 14:29:59 0
Factory reset your harddrive. (BE CAREFUL!)
This is sample output - yours may be different.
1

hdparm --yes-i-know-what-i-am-doing --dco-restore /dev/sdX

wuziduzi · 2019-07-04 14:20:27 7
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Shows physically connected drives (SCSI or SATA)

This will show all physically connected SATA (and SCSI) drives on your system. This is particularly useful when troubleshooting hard disks.... or when a mount point seems to be missing.

Find the fastest server to disable comcast's DNS hijacking

Comcast is an ISP in the United States that has started hijacking DNS requests as a "service" for its customers. For example, in Firefox, one used to be able to do a quick "I'm Feeling Lucky" Google search by typing a single word into the URL field, assuming the word is not an existing domain when surrounded by www.*.com. Comcast customers never receive the correct NX (non-existent domain) error from DNS. Instead, they are shown a page full of advertising. There is a way to "opt out" from their service, but that requires having the account password and the MAC address of your modem handy. For me, it was easier just to set static DNS servers. But the problem is, which ones to choose? That's what this command answers. It'll show you the three _non-hijacked_ Comcast DNS servers that are the shortest distance away. Perhaps you don't have Comcast (lucky you!), but hopefully this command can serve as an example of using netselect to find the fastest server from a list. Note that, although this example doesn't show it, netselect will actually perform the uniq and DNS resolution for you. Requires: netselect, curl, sort, uniq, grep

convert wav into mp3 using lame

monitor a tail -f command with multiple processes

when using named pipes only one reader is given the output by default. Also, most commands piped to by grep use a buffer which save output until tail -f finishes, which is not convenient. Here, using a combination of tee, sub-processes and the --line-buffered switch in grep we can workaround the problem.

Bring the word under the cursor on the :ex line in Vim

Very handy to bring the word currently under the cursor into a :s command in Vim. Example: If the cursor was on the word "eggs": :s/ ==> :s/eggs

View all new log messages in real time with color

The Hidden PS

While going through the source code for the well known ps command, I read about some interesting things.. Namely, that there are a bunch of different fields that ps can try and enumerate for you. These are fields I was not able to find in the man pages, documentation, only in the source. Here is a longer function that goes through each of the formats recognized by the ps on your machine, executes it, and then prompts you whether you would like to add it or not. Adding it simply adds it to an array that is then printed when you ctrl-c or at the end of the function run. This lets you save your favorite ones and then see the command to put in your .bash_profile like mine at : http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html Note that I had to do the exec method below in order to pause with read. t () { local r l a P f=/tmp/ps c='command ps wwo pid:6,user:8,vsize:8,comm:20' IFS=' '; trap 'exec 66

Making scripts runs on backgourd and logging output

Save all output to a log.

Recursively execute command on directories (.svn, permissions, etc)

The above command will set the GID bit on all directories named .svn in the current directory recursively. This makes the group ownership of all .svn folders be the group ownership for all files created in that folder, no matter the user. This is useful for me as the subversion working directory on my server is also the live website and needs to be auto committed to subversion every so often via cron as well as worked on by multiple users. Setting the GID bit on the .svn folders makes sure we don't have a mix of .svn metadata created by a slew of different users.

View and review the system process tree.

The "pstree" command uses special line-drawing characters. However, when piped into the "less" pager, these are normally disabled.

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