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regex to match an ip

Handles everything except octets with 255. Ran through ip generator with variable octet lengths.
This is sample output - yours may be different.
-1

echo 127.0.0.1 | egrep -e '^(([01]?[0-9]{1,2}|2[0-4][0-9]|25[0-4])\.){3}([01]?[0-9]{1,2}|2[0-4][0-9]|25[0-4])$'

arcege · 2009-09-17 17:40:48 3
Enable passwordless login

It is safe when there is "PermitEmptyPasswords no" in /etc/ssh/sshd_config. This command is useful when there is no need to have a password.
This is sample output - yours may be different.
-1

sudo usermod -p $(mkpasswd '') user_id

ckclark · 2010-05-06 20:39:58 43
Uptime in minute

Get info directly from /proc/uptime
This is sample output - yours may be different.
-1

awk '{print $0/60;}' /proc/uptime

ioggstream · 2011-08-31 10:41:21 17
remote ssh xdmcp session

ssh compresion -C option ... on slow connection VNC performs better but in local LAN native secure X protocol is an option Show Sample Output
This is sample output - yours may be different.
```
remote login screen
```
-1

ssh -XfC -c blowfish user@host Xephyr dpms -fullscreen -query localhost :5

hute37 · 2012-11-01 18:59:57 9
External IP (raw data)
This is sample output - yours may be different.
-1

curl curlmyip.com

inzel · 2013-09-19 19:12:53 7
chain search and replace special characters to html entities in gvim

a brief list of very common special characters in Dutch. Usefull for formatting Word source to html.
This is sample output - yours may be different.
-1

%s/?/\ï/ge | %s/?/\é/ge | %s/?/"/ge | %s/?/"/ge | %s/?/'/ge | %s/?/'/ge | %s/?/\ê/ge | %s/?/\/ge | %s/?/\è/ge | %s/?/\ó/ge | %s/?/\ö/ge | %s/?/\é/ge | %s/?/\–/ge | %s/?/\—/ge

miccaman · 2010-07-15 07:40:45 4
df without line wrap on long FS name

all on one line and you also get the filesystem type Show Sample Output
This is sample output - yours may be different.
```
Filesystem         Mount               Size     Used    Avail %Used  fs Type 
/dev/sda2          /                 109,1G    39,3G    64,3G   41%  ext4    
/dev/sda1          /boot             896,8M   251,8M   597,1M   33%  ext2    
```
-1

di

Christian · 2013-01-06 09:07:58 5
Change dates/timestamps of all files in the current folder
This is sample output - yours may be different.
-1

gci -rec | %{ $_.lastWriteTime = ($_.lastAccessTime = ($_.creationTime = (get-date "2021-05-19T10:14:00"))) }

swarzynski · 2022-01-12 08:08:40 374
Rename *.MP3 *.Mp3 *.mP3 etc.. to *.mp3.

Extensible to other ugly extensions like *.JPG, *.Jpg etc.. Leave out the last pipe to sh to perform a dry run.
This is sample output - yours may be different.
-1

find ./ -iname "*.mp3" -type f -printf "mv '%p' '%p'\n" | sed -e "s/mp3'$/mp3'/I" | sh

jnash · 2009-03-27 13:42:40 11
for loop with leading zero in bash 3

Bash 4 will let you do {00..19} to get leading zeros, but Bash 3 doesn't have that feature. This technique gets you partway there (the sequences need be such that the last digit ranges from zero to nine - you can't use this for something like Bash 4's {03..27}, for example). When this limitation is not a problem, you can avoid some complicated string manipulation for concatenating leading zeros. You can add more digits like this: {0..1}{0..9}{0..9} (ranges from 0 to 99 with up to two leading zeros). To pad with additional zeros: for i in 000{0..1}{0..9}; do echo $i; done or for i in {0..1}{0..9}; do echo "000$i"; done This is useful for creating values to sort or for creating filenames with a fixed format. Note that this will also work: touch {0..1}{0..9} Show Sample Output
This is sample output - yours may be different.
```
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
```
-1

for i in {0..1}{0..9}; do echo $i; done

dennisw · 2009-09-18 02:51:12 5
Capture screen and default audio input device and generate an incompress AVI file

The command generate an huge output file (depending on screen resolution and time).
This is sample output - yours may be different.
-1

gst-launch avimux name=mux ! filesink location=out.avi \ alsasrc ! audioconvert ! queue ! mux. istximagesrc name=videosource use-damage=false ! video/x-raw-rgb,framerate=10/1 ! videorate ! ffmpegcolorspace ! video/x-raw-yuv,framerate=10/1 ! mux.

Nicolargo · 2010-07-15 09:39:51 5
pbzip2 tar pipe to untar
This is sample output - yours may be different.
-1

pbzip2 -dck <bz2file> | tar xvf -

maarten · 2010-08-16 22:16:50 3
Jump to any directory above the current
This is sample output - yours may be different.
-1

jda() { cd $(pwd | sed "s/$\/$@\/$.*/\1/g"); }

saibbot · 2011-10-05 21:14:57 5
Convert Windows/DOS Text Files to Unix

converts non-ISO dos text files for use on unix systems.
This is sample output - yours may be different.
-1

dos2unix dostxt unixtxt

wwest4 · 2009-02-05 21:11:43 17
Recursively search a directory tree for all .php .inc .html .htm .css .js files for a certain string

Use find to recursively make a list of all files from the current directory and downwards. The files have to have an extension of the ones listed. Then for every file found, grep it for 'searchString', returns the filename if searchString is found. Show Sample Output
This is sample output - yours may be different.
```
./index.html
./lib/php/buttons.php
```
-1

find . -type f $ -name "*.js" -o -name "*.php" -o -name "*.inc" -o -name "*.html" -o -name "*.htm" -o -name "*.css" $ -exec grep -il 'searchString' {} \;

niels_bom · 2010-02-07 15:28:20 3
easily find megabyte eating files or directories

Essentially the same as funky's alias, but will not traverse filesystems and has nicer formatting. Show Sample Output
This is sample output - yours may be different.
```
You could add this in your profile with a different format to make it look less daunting:
$ alias dush="du -xsm * | \
              sort -n | \
              awk '{ \
                printf(\"%4s MB  ./\",\$1); \
                for ( i=1 ; i<=NF ; i++ ) { \
                  if ( i > 1 ) printf(\"%s \",\$i) \
                }; \
                printf(\"\n\") \
              }' | \
              tail"
```
-1

alias dush="du -xsm * | sort -n | awk '{ printf(\"%4s MB ./\",\$1) ; for (i=1;i<=NF;i++) { if (i>1) printf(\"%s \",\$i) } ; printf(\"\n\") }' | tail"

dopeman · 2010-07-15 10:38:27 4
Remove all leading and trailing slashes on each line of a text file

There can be more than one trailing slash, all of them will be removed.
This is sample output - yours may be different.
-1

sed -e "s,/\+$,," -e "s,^/\+,," file.txt

bugmenot · 2012-11-02 21:08:30 8
run as system on windows

In 2014, ask a kind of specific UAC authorization to run due to his dangerousity.
This is sample output - yours may be different.
-1

@echo off && sc create CmdAsSystem type= own type= interact binPath= "cmd /c start cmd /k (cd c:\ ^& color ec ^& title ***** SYSTEM *****)" && net start CmdAsSystem && sc delete CmdAsSystem

willemijns · 2010-02-07 15:28:28 4
easy seach ip
This is sample output - yours may be different.
-1

ifconfig eth0|awk '/HWaddr/{gsub(/:/,"",$5);print $5}'

leoiceo · 2013-03-08 06:36:20 5
Generate CHECK TABLE statements for all MySQL database tables on a server

This command will generate "CHECK TABLE `db_name.table_name` ;" statements for all tables present in databases on a MySQL server, which can be piped into the mysql command. (Can also be altered to perform OPTIMIZE and REPAIR functions.) Tested on MySQL 4.x and 5.x systems in a Linux environment under bash. Show Sample Output
This is sample output - yours may be different.
```
CHECK TABLE `mysql.columns_priv` ;
CHECK TABLE `mysql.db` ;
CHECK TABLE `mysql.func` ;
CHECK TABLE `mysql.help_category` ;
CHECK TABLE `mysql.help_keyword` ;
CHECK TABLE `mysql.help_relation` ;
CHECK TABLE `mysql.help_topic` ;
CHECK TABLE `mysql.host` ;
CHECK TABLE `mysql.tables_priv` ;
CHECK TABLE `mysql.time_zone` ;
CHECK TABLE `mysql.time_zone_leap_second` ;
CHECK TABLE `mysql.time_zone_name` ;
CHECK TABLE `mysql.time_zone_transition` ;
CHECK TABLE `mysql.time_zone_transition_type` ;
CHECK TABLE `mysql.user` ;
CHECK TABLE `mysql.user_info` ;
```
-1

DD=`cat /etc/my.cnf | sed "s/#.*//g;" | grep datadir | tr '=' ' ' | gawk '{print $2;}'` && ( cd $DD ; find . -mindepth 2 | grep -v db\.opt | sed 's/\.\///g; s/\....$//g; s/\//./;' | sort | uniq | tr '/' '.' | gawk '{print "CHECK TABLE","`"$1"`",";";}' )

atcroft · 2009-07-25 03:42:31 15
nested XDMCP login

XDMCP ust be enabled (gdm,lightdm,xdm etc ) Show Sample Output
This is sample output - yours may be different.
```
nested login screen
```
-1

/usr/bin/Xephyr :5 -query localhost -once -fullscreen -ac -keybd "ephyr,,,xkbmodel=pc105,xkblayout=it,xkbrules=evdev,xkboption="

hute37 · 2012-11-03 01:21:36 41

View your motherboard's ACPI tables (in Debian & Ubuntu)

In July 2008, there was an uproar over Foxconn motherboards feeding Linux installs incorrect ACPI information (http://ubuntu-virginia.ubuntuforums.org/showthread.php?t=869249). Foxconn has gladly corrected their mistake, but make sure it's not happening on your motherboard! After running the command, just view the 'dsdt.dsl' in any editor you like. Show Sample Output

-1

sudo aptitude -y install iasl && sudo cat /sys/firmware/acpi/tables/DSDT > dsdt.dat && iasl -d dsdt.dat

brettalton · 2009-02-15 23:13:50 13

dig this
This is sample output - yours may be different.
-1

for dnsREC in $(curl -s http://www.iana.org/assignments/dns-parameters |grep -Eo ^[A-Z\.]+\ |sed 's/TYPE//'); do echo -n "$dnsREC " && dig +short $dnsREC IANA.ORG; done

commandlinefu · 2009-09-01 03:11:18 3
force change password for all user
This is sample output - yours may be different.
-1

for i in `cat /etc/passwd | awk -F : '{ print $1 }';`; do passwd -e $i; done

irraz · 2009-11-11 13:01:22 3
Extract all urls from the last firefox sessionstore.js file used.
This is sample output - yours may be different.
-1

sed -e 's/{"url":/\n&/g' ~/.mozilla/firefox/*/sessionstore.js | cut -d\" -f4

cfajohnson · 2009-12-10 04:31:31 4
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Watch how many tcp connections there are per state every two seconds.

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Save a copy of all debian packages in the form in which they are installed and configured on your system

A copy of all installed debian packages on your system will be put back together, with all changes in configuration files you made and placed in the current directory. Make sure you have enough disk space (say 2-3 GB). Break any time with Ctrl+C.

Convert all WMF images to SVG recursively ignoring file extension case

This assumes you have the package installed necessary for converting WMF files. On my Ubuntu box, this is libwmf-bin. I used this command, as libwmf is not on my wife's iMac, so I archived the directories containing the WMF files from OS X, ran them on my Ubuntu box, archived the resulting SVGs, and sent them back to her. Quick, simple and to the point. Searches directories recursively looking for extensions ignoring case. This is much more readable and clean than -exec for find. The while loop also gives further flexibility on complex logic. Also, although there is 'wmf2svg --auto', it expects lowercase extensions, and not uppercase. Because I want to ignore case, I need to use the -o option instead. Works in ZSH and BASH. Haven't tested in other shells.

Get the time from NIST.GOV

The format is JJJJJ YR-MO-DA HH:MM:SS TT L DUT1 msADV UTC(NIST) OTM and is explained more fully here: http://tf.nist.gov/service/acts.htm

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use google's text-to-speech and play in media player

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

Alert on high ping to know if it's really laggy while playing

Online games have pretty good lag compensation nowadays, Sometimes though, you really want to get some warning about your latency, e.g. while playing Diablo III in Hardcore mode, so you know when to carefully quit the game b/c your flatmate started downloading all his torrents at once. This is done on Darwin. On Linux/*nix you would need to find another suitable command instead of `say` to spell out your latency. And I used fping because it's a little bit easier to get the latency value needed. Something similar with our regular ping command could look like this: $ while :; do a=$(ping -c1 google.com | grep -o 'time.*' | cut -d\= -f2 | cut -d\ -f1 | cut -b1-4); [[ $a > 40 ]] && say "ping is $a"; sleep 3; done

Extract audio stream from an AVI file using mencoder

This commands saves the output in the audio directory. The portion ${file/%avi/mp3} uses bash string replacement to replace the avi to mp3 within the ${file} variable.

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