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List all symbolic links in current directory

For those who don't have the symlinks command, you can use readlink. This command is not straightforward because readlink is very picky. The backslash in front of 'ls' means not to use an alias (e.g. color escape codes from an aliased 'ls' could mess up readlink), and the -1 (one) means to print the entries separated by newlines. xargs -l (the letter L) means to process each input separated by newlines as separate commands.
This is sample output - yours may be different.
2

\ls -1 | xargs -l readlink

TeacherTiger · 2009-11-23 19:28:03 7
Find all dot files and directories

In most modern shells, printf is a builtin command.
This is sample output - yours may be different.
0

printf "%s\n" .*

cfajohnson · 2009-11-23 18:07:18 3
List all symbolic links in current directory
This is sample output - yours may be different.
-2

ls -F | sed -n 's/@$//p'

putnamhill · 2009-11-23 16:46:58 5
List the biggest accessible files/dirs in current directory, sorted
This is sample output - yours may be different.
1

du -ms * 2>/dev/null |sort -nr|head

yooreck · 2009-11-23 16:06:40 3
List all symbolic links in current directory

ls -l may vary depending on operating system, so "print $8" may have to be changed
This is sample output - yours may be different.
-3

ls -l `ls -l |awk '/^l/ {print $8}'`

yooreck · 2009-11-23 16:02:18 3
Find all dot files and directories
This is sample output - yours may be different.
2

ls -d .*

yooreck · 2009-11-23 15:58:52 4
Mount a Windows share on the local network (Ubuntu) with user rights and use a specific samba user
This is sample output - yours may be different.
7

sudo mount -t cifs -o user,username="samba username" //$ip_or_host/$sharename /mnt

ludogomez · 2009-11-23 15:26:23 8
Debian Runlevel configuration tool

This tool configures system services in connection with system runlevels. It turns on/off services using the scripts in /etc/init.d/. Rcconf works with System-V style runlevel configuration. It is a TUI(Text User Interface) frontend to the update-rc.d command.
This is sample output - yours may be different.
1

rcconf

tiagofischer · 2009-11-23 14:32:43 5
Make all GUI stuff show up on the display connected to the computer (when you're logged in via SSH)

If you have multiple displays or monitors the DISPLAY environment variable will tell X where to send the output. This is very handy for setting up a mediacenter at home. You can plugin the computer to the TV and then ssh to the computer and set the DISPLAY as above, then run your program and it will show up on the TV.
This is sample output - yours may be different.
1

DISPLAY=:0.0; export DISPLAY

sb · 2009-11-23 14:28:39 3
Mount a Windows share on the local network (Ubuntu)

Mount a Windows share. Usually the IP is needed for the $ip_or_host option. Getting hostnames working on a local network never seems to work.
This is sample output - yours may be different.
-2

sudo mount -t cifs //$ip_or_host/$sharename /mnt

sb · 2009-11-23 14:24:02 3
Set the master volume to 90% (Ubuntu)
This is sample output - yours may be different.
0

aumix -v 90

sb · 2009-11-23 14:20:16 5
Locking and unlocking files and mailboxes

Programs for locking and unlocking files and mailboxes.This package includes several programs to safely lock and unlock files and mailboxes from the command line. These include: lockfile-create lockfile-remove lockfile-touchlock mail-lock mail-unlock mail-touchlock These programs use liblockfile to perform the file locking and unlocking, so they are guaranteed compatible with Debian's file locking policies.
This is sample output - yours may be different.
4

lockfile

tiagofischer · 2009-11-23 12:07:07 4
DVD to YouTube ready watermarked MPEG-4 AVI file using mencoder (step 2)

Reencodes to MPEG-4 DivX output video file from step 1. Audio stream is simply copied. Resizes to 320x240 and deinterlaces as needed. A heading subtitle file is applied as watermark. This heading subtitle file can be a URL.
This is sample output - yours may be different.
3

mencoder -sub heading.ssa -subpos 0 -subfont-text-scale 4 -utf8 -oac copy -ovc lavc -lavcopts vcodec=mpeg4 -vf scale=320:-2,expand=:240:::1 -ffourcc xvid -o output.avi dvd.avi

ivalladt · 2009-11-23 11:58:42 6
DVD to YouTube ready watermarked MPEG-4 AVI file using mencoder (step 1)

Rips DVD to lossless encoded video file. Reencodes audio to CBR MP3 for correct audio to video syncing. Be sure to have enough free disk space.
This is sample output - yours may be different.
0

mencoder -oac mp3lame -lameopts cbr=128 -ovc lavc -lavcopts vcodec=mjpeg -o dvd.avi dvd://0

ivalladt · 2009-11-23 11:53:30 4
extract email adresses from some file (or any other pattern)

Simply more email-adresses matched Show Sample Output
This is sample output - yours may be different.
```
hello-foo.bar-test@mail.foo-bar.com -> Match!
```
10

grep -Eio '([[:alnum:]_.-]+@[[:alnum:]_.-]+?\.[[:alpha:].]{2,6})'

fooBier · 2009-11-22 21:14:49 7
Checks apache's access_log file, strips the search queries and shoves them up your e-mail

as unixmonkey7109 pointed out, first awk parse replaces three steps.
This is sample output - yours may be different.
1

awk '/q=/{print $11}' /var/log/httpd/access_log.4 | awk -F 'q=' '{print $2}' | sed 's/+/ /g;s/%22/"/g;s/q=//' | cut -d "&" -f 1

isma · 2009-11-22 17:13:48 69
Checks apache's access_log file, strips the search queries and shoves them up your e-mail

It's not a big line, and it *may not* work for everybody, I guess it depends on the detail of access_log configuration in your httpd.conf. I use it as a prerotate command for logrotate in httpd section so it executes before access_log rotation, everyday at midnight.
This is sample output - yours may be different.
-2

cat /var/log/httpd/access_log | grep q= | awk '{print $11}' | awk -F 'q=' '{print $2}' | sed 's/+/ /g;s/%22/"/g;s/q=//' | cut -d "&" -f 1 | mail youremail@isp.com -s "[your-site] search strings for `date`"

isma · 2009-11-22 03:03:06 9
Find iPod's fwguid

This is a bit of a hack, but it will get your fwguid which is needed sometimes when using your iPod. Show Sample Output
This is sample output - yours may be different.
```
000A27001BB1BE3F
```
-1

lsusb -v | grep -o "[0-9A-Z]{16}"

matthewbauer · 2009-11-22 00:58:00 4
Burn a directory of mp3s to an audio cd.

This uses mpg123 to convert the files to wav before burning, but you can use mplayer or mencoder or ffmpeg or lame with the --decode option, or whatever you like.
This is sample output - yours may be different.
3

alias burnaudiocd='mkdir ./temp && for i in *.[Mm][Pp]3;do mpg123 -w "./temp/${i%%.*}.wav" "$i";done;cdrecord -pad ./temp/* && rm -r ./temp'

eightmillion · 2009-11-21 19:57:18 3
Find all dot files and directories
This is sample output - yours may be different.
6

echo .*

unixmonkey7109 · 2009-11-21 04:07:28 5
remove files and directories with acces time older than a given date

touch a dummy file with the specified date, then use find with -anewer .
This is sample output - yours may be different.
2

touch -t "YYYYMMDDhhmm.ss" dummy ; find . -anewer dummy

unixmonkey7109 · 2009-11-21 04:05:45 4
Show sorted list of files with sizes more than 1MB in the current dir

GNU find + sort
This is sample output - yours may be different.
0

find . -maxdepth 1 -type f -size +1M -printf "%f:%s\n" | sort -t":" -k2

unixmonkey7109 · 2009-11-21 03:47:39 3
Make sure a script is run in a terminal.

Exit with error if script is not run in a terminal
This is sample output - yours may be different.
21

[ -t 0 ] || exit 1

cfajohnson · 2009-11-20 23:14:49 10
Get your external IP address
This is sample output - yours may be different.
0

wget -qO - http://www.sputnick-area.net/ip;echo

cfajohnson · 2009-11-20 23:10:31 4
List all available commands (bash, ksh93)
This is sample output - yours may be different.
7

printf "%s\n" ${PATH//:/\/* }

cfajohnson · 2009-11-20 22:55:59 4
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Count the number of characters in each line

Summarize the number of open TCP connections by state

Useful for checking the number and state of TCP connections.

Report bugs in Ubuntu

As of 10.04 LTS, you need to use this command-line to reports bugs to the launchpad.net tracking system (you need a launchpad acct for this to work). This command is preferred over using the website because it collects/sends info about your system to help developers. ubuntu-bug is a symlink to apport-bug which sees if KDE/Gnome is running and calls apport-gtk/apport-kde dialogs, otherwise apport-cli, so you can fill out a bug report. First run 'ubuntu-bug' without args to see a list of known symptoms. If there's no matching symptom, or you know which package is to blame, then run 'ubuntu-bug <package>'. If the process is still running, use 'ubuntu-bug <PID>'

Colorized grep in less

Get your colorized grep output in less(1). This involves two things: forcing grep to output colors even though it's not going to a terminal and telling less to handle those properly.

Benchmark SQL Query

Benchmark a SQL query against MySQL Server. The example runs the query 10 times, and you get the average runtime in the output. To ensure that the query does not get cached, use `RESET QUERY CACHE;` on top in the query file.

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

convert wav files to flac

cd to the folder containing the wav files, then convert them all to flac. yeah baby! in ubuntu, to get the flac program just: sudo apt-get install flac flac file input formats are wav, aiff, raw, flac, oga and ogg

Drop or block attackers IP with null routes

Someone might attack on your system. You can drop attacker IP using IPtables. However, you can use route command to null route unwanted traffic. A null route (also called as blackhole route) is a network route or kernel routing table entry that goes nowhere. Matching packets are dropped (ignored) rather than forwarded, acting as a kind of very limited firewall. The act of using null routes is often called blackhole filtering.

Re-emerge all ebuilds with missing files (Gentoo Linux)

Get last sleep time on a Mac

Similarly for last wake time: $ sysctl -a | grep waketime

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