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Parse an RPM name into its components - fast

parse_rpm xorg-x11-fonts-ISO8859-1-75dpi-7.1-2.1.el5.noarch.rpm xorg-x11-fonts-ISO8859-1-75dpi 7.1 2.1.el5 noarch It's a little tricky because RPM names can contain '-' and the name, version and release number can contain '.' This is one or two orders of magnitude faster than using rpm itself: rpm -qp --queryformat '%{N} %{V} %{R} %{ARCH}\n' $RPM
This is sample output - yours may be different.
0

parse_rpm() { RPM=$1;B=${RPM##*/};B=${B%.rpm};A=${B##*.};B=${B%.*};R=${B##*-};B=${B%-*};V=${B##*-};B=${B%-*};N=$B;echo "$N $V $R $A"; }

bhepple · 2009-12-19 20:07:26 50
Dump mySQL db from Remote Database to Local Database

You can use this to dump you database from remote db to your local db.
This is sample output - yours may be different.
1

mysqldump --host=[remote host] --user=[remote user] --password=[remote password] -C db_name | mysql --host=localhost --user=[local user] --password=[local password] db_name

all4artz · 2009-12-19 19:47:07 6
Another Matrix Style Implementation

A bit different from some of the other submissions. Has bold and uses all c printable characters. Change the bs=value to speed up and increase the sizes of the bold and non-bold strings.
This is sample output - yours may be different.
5

echo -ne "\e[32m" ; while true ; do echo -ne "\e[$(($RANDOM % 2 + 1))m" ; tr -c "[:print:]" " " < /dev/urandom | dd count=1 bs=50 2> /dev/null ; done

psykotron · 2009-12-19 19:05:04 4
Awk one-liner that sorts a css file by selector
This is sample output - yours may be different.
1

awk '/.*{$/{s[$1]=z[$1]=j+0}{l[j++]=$0}END{asorti(s);for(v in s){while(l[z[s[v]]]!~/}$/)print l[z[s[v]]++];print"}"ORS}}'

pkrumins · 2009-12-19 16:38:33 5
display embeded comments for every --opt, usefull for auto documenting your script

A really fun vim oneliner for auto documenting your option's parsing in your script. # print the text embeded in the case that parse options from command line. # the block is matched with the marker 'CommandParse' in comment, until 'esac' extract_cmdl_options() { # use vim for parsing: # 1st grep the case block and copy in register @p + unindent in the buffer of the file itself # 2nd filter lines which start with --opt or +opt and keep comment on hte following lines until an empty line # 3rd discard changes in the buffer and quit vim -n -es -c 'g/# CommandParse/+2,/^\s\+esac/-1 d p | % d | put p | % -c 'g/^$[-+]\+[^)]\+$)/,/^$\s\+[^- \t#]\|^$$/-1 p' \ -c 'q!' $0 } example code:http://snipplr.com/view/25059/display-embeded-comments-for-every-opt-usefull-for-auto-documenting-your-script/ Show Sample Output
This is sample output - yours may be different.
```
$ ./t_extract_cmdl_options.sh --help
--help)
        # This help message
--some_option)
--etc)
        # nothing done
--exemple)
        # print more example, and exit
```
0

vim -n -es -c 'g/# CommandParse/+2,/^\s\+esac/-1 d p | % d | put p | %<' -c 'g/^$[-+]\+[^)]\+$)/,/^$\s\+[^- \t#]\|^$$/-1 p' -c 'q!' $0

syladmin · 2009-12-19 08:32:00 5
p is for pager

Manpages, command summaries, and pretty much everything else usually have the information you're most likely to want at the beginning. Seeing just the last 40 or so lines of options from a command that has 100 is not super useful, and having to scroll up each time you want to glance at something is spastic. Run this and then do something like p do vi --help and you'll get the first screen(-mostly-)full of vi's usage info and options list Then use p d to page down, and p u to page up. To see the current page again: p r Also useful for situations like p do aptitude search ~dsmorgasbord p next #p sudo aptitude -r install libwickedawesome-perl-snoochieboochies p next p sudo aptitude -r install libwickedawesome-perl-snoochieboochies snazztasticorama-dev-v0.∞ where you're using readline up-arrow, HOME, END, etc., to quickly recall commented commands. For the unaware, that option to aptitude search will bring up all of the packages whose descriptions contain the string "smorgasbord". Depending on your distro, there could potentially be hundreds of them.
This is sample output - yours may be different.
0

p() { l=$LINES; case $1 in do) shift; IFS=$'\n' _pg=( $("$@") ) && _pgn=0 && p r;; r) echo "${_pg[*]:_pgn:$((l-4))}";; d) (( _pgn+=l-4 )); (( _pgn=_pgn>=${#_pg[@]}?${#_pg[@]}-l+4:_pgn )); p r;; u) (( _pgn=_pgn<=l-4?0:_pgn-$l-4 )); p r;; esac; }

intuited · 2009-12-18 23:35:53 10
Watch postgresql calls from your application on localhost

It's certainly not nicely formatted SQL, but you can see the SQL in there...
This is sample output - yours may be different.
1

sudo tcpdump -nnvvXSs 1514 -i lo0 dst port 5432

ethanmiller · 2009-12-18 17:12:44 4
copy working directory and compress it on-the-fly while showing progress

What happens here is we tell tar to create "-c" an archive of all files in current dir "." (recursively) and output the data to stdout "-f -". Next we specify the size "-s" to pv of all files in current dir. The "du -sb . | awk ?{print $1}?" returns number of bytes in current dir, and it gets fed as "-s" parameter to pv. Next we gzip the whole content and output the result to out.tgz file. This way "pv" knows how much data is still left to be processed and shows us that it will take yet another 4 mins 49 secs to finish. Credit: Peteris Krumins http://www.catonmat.net/blog/unix-utilities-pipe-viewer/ Show Sample Output
This is sample output - yours may be different.
```
253MB 0:00:05 [46.7MB/s] [>     ]  1% ETA 0:04:49
```
27

tar -cf - . | pv -s $(du -sb . | awk '{print $1}') | gzip > out.tgz

opertinicy · 2009-12-18 17:09:08 13
Sometimes you just want a quick way to find out if a certain user account is locked [Linux].
This is sample output - yours may be different.
0

getent shadow | grep '^[^:]\+:!' | cut -d: -f1

hackele · 2009-12-18 16:24:01 6
Sometimes you just want a quick way to find out if a certain user account is locked [Linux].

man 5 shadow I think it's more reliable, because passwd -S dont show "locked" but "L" as second field on my Archlinux for a particular user. ( unixhome alternative ).
This is sample output - yours may be different.
0

getent shadow | while IFS=: read a b c; do grep -q '!' <<< "$b" && echo "$a LOCKED" || echo "$a not locked"; done

sputnick · 2009-12-18 15:24:19 4
Sometimes you just want a quick way to find out if a certain user account is locked [Linux].
This is sample output - yours may be different.
0

awk -F":" '{ print $1 }' /etc/passwd | while read UU ; do STATUS=$(passwd -S ${UU} | grep locked 2>/dev/null) ; if [[ ! -z ${STATUS} ]] ; then echo "Account ${UU} is locked." ; fi ; done

unixhome · 2009-12-18 14:28:15 11
scan folder to check syntax error in php files
This is sample output - yours may be different.
5

find . -name "*.php" -exec php -l {} \;

rbawaskar · 2009-12-18 07:33:59 8
Report What Tape is in Autoloader Mailslot (using Barcode Label)

This reports directly using mtx what Tape is in the mailslot (Import/Export tray) on most autoloaders. You will need to change /dev/sg13 to your autloader device file and adjust the 63 at the end to your tape label character length(ie 63 for 8 characters 64 for 9 characters) Show Sample Output
This is sample output - yours may be different.
```
S00009L3
```
0

mtx -f /dev/sg13 status | grep EXPORT | cut -c 56-63

JamesyBoi · 2009-12-18 04:21:51 3
analyze traffic remotely over ssh w/ wireshark

This captures traffic on a remote machine with tshark, sends the raw pcap data over the ssh link, and displays it in wireshark. Hitting ctrl+C will stop the capture and unfortunately close your wireshark window. This can be worked-around by passing -c # to tshark to only capture a certain # of packets, or redirecting the data through a named pipe rather than piping directly from ssh to wireshark. I recommend filtering as much as you can in the tshark command to conserve bandwidth. tshark can be replaced with tcpdump thusly: ssh root@example.com tcpdump -w - 'port !22' | wireshark -k -i -
This is sample output - yours may be different.
31

ssh root@server.com 'tshark -f "port !22" -w -' | wireshark -k -i -

markdrago · 2009-12-17 23:03:24 38
Sniffing network to generate a pcap file in CLI mode on a remote host and open it via local Wireshark ( GUI ).

Then hit ^C to stop, get the file by scp, and you can now use wireshark like this : wireshark /tmp/sniff.pcap If you have tshark on remote host, you could use that : wireshark -k -i <(ssh -l root <REMOTE HOST> tshark -w - not tcp port 22) The last snippet comes from http://wiki.wireshark.org/CaptureSetup/Pipes Show Sample Output
This is sample output - yours may be different.
```
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
265 packets captured
265 packets received by filter
0 packets dropped by kernel
```
6

tcpdump -v -i <INTERFACE> -s 0 -w /tmp/sniff.pcap port <PORT> # On the remote side

sputnick · 2009-12-17 22:08:30 3
count and number lines of output, useful for counting number of matches

If you're on a system that doesn't have nl, you can use cat -n.
This is sample output - yours may be different.
0

ps aux | grep [h]ttpd | cat -n

putnamhill · 2009-12-17 20:45:44 5
Read just the IP address of a device
This is sample output - yours may be different.
1

/sbin/ip -f inet addr | sed -rn 's/.*inet ([^ ]+).*(eth[[:digit:]]*(:[[:digit:]]+)?)/\2 \1/p' | column -t

owen · 2009-12-17 19:48:28 3

count and number lines of output, useful for counting number of matches

Write each FILE to standard output, with line numbers added. With no FILE, or when FILE is -, read standard input. Show Sample Output

ps aux | grep [a]pache2 | nl

donnoman · 2009-12-17 18:48:09 4

Random colours at random locations
This is sample output - yours may be different.
2

p(){ printf "\033[%d;%dH\033[4%dm \033[m" $((RANDOM%LINES+1)) $((RANDOM%COLUMNS+1)) $((RANDOM%8)); }; clear;while :;do p; sleep .001;done

cfajohnson · 2009-12-17 15:25:28 3
Create SSH key exchange from one host to the other

Well its just appending your public key to the remote hosts authorized_keys, but can get messy logging in and out
This is sample output - yours may be different.
0

cat ~/.ssh/id_rsa.pub | ssh <remote_host> "xargs --null echo >> ~/.ssh/authorized_keys"

koushik · 2009-12-17 15:12:11 9
Create sqlite db and store image

Creates a simple sqlite db (img.db) inserts /tmp/Q.jpg on base64 an recorvers it as /tmp/W.jpg
This is sample output - yours may be different.
1

sqlite3 img.db "create table imgs (id INTEGER PRIMARY KEY, img BLOB); insert into imgs (img) values (\"$(base64 -w0 /tmp/Q.jpg)\"); select img from imgs where id=1;" | base64 -d -w0 > /tmp/W.jpg

unixApe · 2009-12-16 20:08:47 3
Altera texto dentro dos arquivos retornados pelo comando 'find' (find and replacing strings on all files in directory)

Esse comando procura por arquivos php que que iniciem com ' Show Sample Output
This is sample output - yours may be different.
```
$
```
-8

find ./wp-content/themes/rotce2009/ -name '*.php' -type f | xargs sed -i 's/<? /<?php /g'

anestesya · 2009-12-16 19:01:12 4
Open a RemoteDesktop from terminal
This is sample output - yours may be different.
-2

rdesktop -a 16 luigi:3052

rduarte · 2009-12-16 17:14:05 3
Save VM running as headless
This is sample output - yours may be different.
-2

VBoxManage controlvm ServidorProducao savestate

rduarte · 2009-12-16 17:12:11 3
Running VirtualBox as headless
This is sample output - yours may be different.
-3

nohup VBoxHeadless -p 3052 -startvm ServidorProducao &

rduarte · 2009-12-16 17:10:30 3
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Rename files with vim.

Opens a list of files in a text editor. Using Vim as your default editor allows you to use the power of regex substitution and visual block mode to batch rename files. Found in the renameutils package sudo apt-get install renameutils

Send youtube video to Kodi

Kodi needs the youtube plugin to be installed.

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Print unique ipaddresses as they come in from Apache Access Log File

Prints the unique IP Addresses as they arrive from an Apache `access.log` file. The '-W interactive' tells awk to start writing to stdout immediately and not buffer the output. This command builds on the uniq lines without sorting command (http://www.commandlinefu.com/commands/view/4389/remove-duplicate-entries-in-a-file-without-sorting.)

Find which service was used by which port number

Stream YouTube URL directly to mplayer.

This is the result of a several week venture without X. I found myself totally happy without X (and by extension without flash) and was able to do just about anything but watch YouTube videos... so this a the solution I came up with for that. I am sure this can be done better but this does indeed work... and tends to work far better than YouTube's ghetto proprietary flash player ;-) Replace $i with any YouTube ID you want and this will scrape the site for the _real_ URL to the full quality .FLV file on Youtube's server and will then will hand that over to mplayer (or vlc or whatever you want) to be streamed. In some browsers you can replace $i with just a % or put this in a shell script so all YouTube IDs can be handed directly off to your media player of choice for true streaming without the need for Flash or a downloader like clive. (I do however fully recommend clive if you wish to archive videos instead of streaming them) If any interest is shown I would be more than happy to provide similar commands for other sites. Most streaming flash players use similar logic to YouTube. Edit: 05/03/2011 - Updated line to work with current YouTube. It could be a lot prettier but I will probably follow up with another update when I figure out how to get rid of that pesky Grep. Sed should take that syntax... but it doesn't. Original (no longer working) command: mplayer -fs $(echo "http://youtube.com/get_video.php?$(curl -s $youtube_url | sed -n "/watch_fullscreen/s;.*$video_id.\+$&title.*;\1;p")")

Find the package that installed a command

C one-liners

$ /lib/ld-linux.so.2 is the runtime linker/loader for ELF binaries on Linux. =(cmd) is a zsh trick to take the output for the command "inside" it and save it to a temporary file. $ echo -e 'blah' | gcc -x c -o /dev/stdout - pipes the C source to gcc. -x c tells gcc that it's compiling C (which is required if it's reading from a pipe). -o /dev/stdout - tells it to write the binary to standard output and read the source from standard input. because of the the =() thing, the compiled output is stashed in a tempfile, which the loader then runs and executes, and the shell tosses the tempfile away immediately after running it.

Print number of mb of free ram

This will show the amount of physical RAM that is left unused by the system.

Unix commandline history substitution like ^foo^bar BUT for multiple replacements

#1 You invoked a command chain. #2 You globaly replace the scriptnames and execute them direct #3 The new executed command chain [# ^foo^bar] would only replace the firts match [foo] with [bar].

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