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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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Generate a random password 30 characters long

This command is similar to the alternate, except with head(1), you can pick as many passwords as you wish to generate by changing the number of lines you wish to preview.

Count items in JSON array

Pipe any JSON to jq, then count with the appropiate expression and use the | length on the array

grep for minus (-) sign

Use flag "--" to stop switch parsing

Run bash on top of a vi session (saved or not saved), run multiple commands, instead of one at a time with :!(bashcommand), type exit and [enter] to get back to where you left off in vi.

Helps when I'm editing a script and want to double check some commands without having to exit out of vi multiple times or having to use another terminal session.

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" }

Remove newlines from output

Remove newlines from output. One character shorter than awk /./ filename and doesn't use a superfluous cat. To be fair though, I'm pretty sure fraktil was thinking being able to nuke newlines from any command is much more useful than just from one file.

list files in 'hitlar' mode

Was playing with the shell. It struck to me, just by rearranging the parameters, i was able to remember what they did and in a cool way. Enter the 'hitlar' mode. bash-3.2$ ls -hitlar Shows all items with inodes, in list view, human readable size, sorted by modification time in reverse, bash-3.2$ ls -Fhitlar Shows the same with classification info. Add the hitlar mode alias to your .bashrc. bash-3.2$ echo "alias hitlar='ls -Fhitlar'" >> ~/.bashrc bash-3.2$ hitlar bash-3.2$ hitlar filename

execute a shell with netcat without -e

how to execute a shell on a server with a netcat binary which doesn't support -e option

print multiplication formulas

seq -s ' ' 1 9 | sed -n ':a;p;s/ *\w$//;h;/^$/t;b a;q' | tac | awk '{for(i=1;i

Given $PID, print all child processes on stdout

Simpler.

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