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Save xkcd to a pdf with captions

Saves to a PDF with title and alt text of comic. As asked for on http://bbs.archlinux.org/viewtopic.php?id=91100 Change xkcd.com to dynamic.xkcd.com/comics/random for a random comic.
This is sample output - yours may be different.
6

curl -sL xkcd.com | grep '<img [^>]*/><br/>' | sed -r 's|<img src="(.*)" title="(.*)" alt="(.*)" /><br/>|\1\t\2\t\3|' > /tmp/a; curl -s $(cat /tmp/a | cut -f1) | convert - -gravity south -draw "text 0,0 \"$(cat /tmp/a | cut -f2)\"" pdf:- > xkcd.pdf

matthewbauer · 2010-03-03 03:41:31 14
Show the 1000*1000 and 1024*1024 size of HDs on system
This is sample output - yours may be different.
1

awk '/d[a-z]+$/{print $4}' /proc/partitions | xargs -i sudo hdparm -I /dev/{} | grep 'device size with M'

rthemocap · 2010-03-02 20:06:03 5
Show the 1000*1000 and 1024*1024 size of HDs on system

I know this sucks in some way but if someone can improve it please be my guest Show Sample Output
This is sample output - yours may be different.
```
        device size with M = 1024*1024:       38166 MBytes
        device size with M = 1000*1000:       40020 MBytes (40 GB)
        device size with M = 1024*1024:       58627 MBytes
        device size with M = 1000*1000:       61475 MBytes (61 GB)
        device size with M = 1024*1024:      238475 MBytes
        device size with M = 1000*1000:      250059 MBytes (250 GB)
```
0

for I in $(awk '/d[a-z]+$/{print $4}' /proc/partitions); do sudo hdparm -I '/dev/'$I; done | grep 'device size with M'

ElAlecs · 2010-03-02 18:56:32 5
simple backup with rsync

With this cron, rsync begins to sinchronize the contents of the local directory on /[VIPdirectory] with the directory /backup/[VIPdirectory] on the remote server X.X.X.X. Previously we need working on public/private-keys ssh to guarantee the acces to the remote server on X.X.X.X Show Sample Output
This is sample output - yours may be different.
```
no output
```
5

0 10 * * * rsync -rau /[VIPdirectory] X.X.X.X:/backup/[VIPdirectory]

mack · 2010-03-02 17:48:54 3
split and combine different pages from different pdf's

The command shows the real power of the pdftk tool, you can do basically everything you want with multiple pdf's. In the command a book is created from chapters, headings and covers.
This is sample output - yours may be different.
7

pdftk A=chapters.pdf B=headings.pdf C=covers.pdf cat C1 B1 A1-7 B2 A8-10 C2 output book.pdf

bw · 2010-03-02 16:04:50 9
Netcat & Tar

Create a tarball on the client and send it across the network with netcat on port 1234 where its extracted on the server in the current directory.
This is sample output - yours may be different.
2

Server: nc -l 1234 |tar xvfpz - ;Client: tar zcfp - /path/to/dir | nc localhost 1234

unixmonkey8504 · 2010-03-02 14:24:04 3
Read directory contents recursively

Read all contents from current directory and display to stdout.
This is sample output - yours may be different.
-6

while read f;do echo "$f";done < <(find .)

unixmonkey8504 · 2010-03-02 14:22:22 3
Read directory contents recursively

Read all contents from current directory and display it on stdout.
This is sample output - yours may be different.
-8

find . |while read f;do echo "$f";done

unixmonkey8504 · 2010-03-02 14:21:15 7
perl find and replace
This is sample output - yours may be different.
-1

find -name ".php" -exec perl -pi -e 's/search/replace/g/' {} \;

unixmonkey8504 · 2010-03-02 14:18:44 3
Find all files and append to file

find all files in cur dir add to url and append to file
This is sample output - yours may be different.
-2

find . type f -exec echo http://exg.com/{} \; > file

unixmonkey8504 · 2010-03-02 14:18:01 3
Create & transfer tarball over ssh

Create tarball on stdout which is piped to tar reading from stdin all over ssh
This is sample output - yours may be different.
0

ssh -c 'tar cvzf - -C /path/to/src/*' | tar xzf -

unixmonkey8504 · 2010-03-02 14:15:17 3
Move itens from subdirectories to current directory

You WILL have problems if the files have the same name. Use cases: consolidate music library and unify photos (especially if your camera separates images by dates). After running the command and verifying if there was no name issues, you can use ls -d */ | sed -e 's/^/\"/g' -e 's/$/\"/g' | xargs rm -r to remove now empty subdirectories.
This is sample output - yours may be different.
-1

ls -d */* | sed -e 's/^/\"/g' -e 's/$/\"/g' | xargs mv -t $(pwd)

leovailati · 2010-03-01 23:43:26 6
finds all files in dir and replaces
This is sample output - yours may be different.
-2

find . -type f -exec sed -i 's/gw10./gw17./g' {} \;

m03hr3 · 2010-03-01 21:40:54 3
Play music from youtube without download

same as above but dumps the stream to a file.
This is sample output - yours may be different.
3

url="$my_url";file=$(youtube-dl -s -e $url);wget -q -O - `youtube-dl -b -g $url`| ffmpeg -i - -f mp3 -vn -acodec libmp3lame - > "$file.mp3"

unixmonkey8504 · 2010-03-01 21:26:13 4
Download free e-books

Mask the user agent as firefox, recursively download 2 levels deep from a span host with a maximum of 1 redirection, use random wait time and dump all pdf files to myBooksFolder without creating any other directories. Host will have no way of knowing that this is a grabber script.
This is sample output - yours may be different.
8

wget -erobots=off --user-agent="Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.3) Gecko/2008092416 Firefox/3.0.3" -H -r -l2 --max-redirect=1 -w 5 --random-wait -PmyBooksFolder -nd --no-parent -A.pdf http://URL

unixmonkey8504 · 2010-03-01 20:22:44 26
Parse bookmarks and download youtube files

Parses your exported bookmarks to generate a clean list of http lines and passes it on to clive to try to download the video file from various sites.
This is sample output - yours may be different.
0

sed 's+href="$[^"]*$"+\n\1\n+g' bookmarks.html | grep '^http' |clive

unixmonkey8504 · 2010-03-01 20:17:22 3
Get all mac address

I prefer the ip command to ifconfig as ifconfig is supposedly going to be deprecated. Certain IP address aliases can only be seen with the ip command (such as the ones applied by RHCS).
This is sample output - yours may be different.
6

ip link show

d34dh0r53 · 2010-03-01 20:10:27 4
Recursively remove .svn directories
This is sample output - yours may be different.
4

find . -type d -name .svn -delete

jmcantrell · 2010-03-01 18:48:31 7

get the result of database query in vertical way (Column=Value)

the database client sqlplus generate results one line per row. This function convert the sqlplus output to show the result vertically, in layout: Column_name=[Column_Value]. Very usefull for scripts. Show Sample Output

vsqlplus "SELECT * FROM TABLE_NAME;"

glaudiston · 2010-03-01 17:11:07 5

grep tab chars

mixing tabs and spaces for indentation in python would confuse the python interpreter, to avoid that, check if the file has any tab based indentation. "^V" => denotes press control + v and press tab within quotes. cat improper_indent.py class Tux(object): print "Hello world.." grep " " improper_indent.py print "Hello world.."
This is sample output - yours may be different.
9

grep "^V<TAB>" your_file

sathyz · 2010-03-01 08:46:02 15
Lists installed kernels

no need for rpm, no need for piping to another command. also no real fu but lacking in unnecessary complexity and distro specific commands.
This is sample output - yours may be different.
6

ls -1 /lib/modules

TheMightyBuzzard · 2010-03-01 06:30:12 8
Lists installed kernels

Exploit that RPM database just sitting there, taking up space. Show Sample Output
This is sample output - yours may be different.
```
$ rpm -qf /lib/modules/*          
kernel-2.6.31.12-174.2.19.fc12.x86_64
kernel-2.6.31.12-174.2.22.fc12.x86_64
```
-5

rpm -qf /lib/modules/*

megacoder · 2010-03-01 05:00:56 3
floating point operations in shell scripts

a simple trick to do floating point operations in shell, use awk. You can evaluate any complicated expressions which can be evaluated in C. Show Sample Output
This is sample output - yours may be different.
```
echo $val  #2.85714
```
0

exp="(2+3.0)/7.0*2^2"; val=$(awk "BEGIN {print $exp}" /dev/null)

JeffChen · 2010-03-01 02:47:22 3
Download all files under http://codeigniter.com/user_guide/ to the current directory

I constantly need to work on my local computer, thus I need a way to download the codeigniter user guide, this is the wget way I figured.
This is sample output - yours may be different.
-2

wget -r --no-parent http://codeigniter.com/user_guide/ ; mv codeigniter.com/user_guide/* . ; rm -rf codeigniter.com

jimthunderbird · 2010-03-01 02:37:26 3
Display which distro is installed

This should work on any RPM-based distribution. It's more reliable than trying to parse the content of the files. Show Sample Output
This is sample output - yours may be different.
```
$ rpm -qf /etc/*-release
fedora-release-12-2.noarch
fedora-release-12-2.noarch
fedora-release-12-2.noarch
```
-11

rpm -qf /etc/*-release

megacoder · 2010-03-01 01:24:07 3
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Clean up the garbage an accidental unzipping makes

List out all the names from the zip file and pass it to xargs utility to delete each one of them

list files recursively by size

Show bz compressed PF binary log

Show all available cows

There are lots of different cow options to use, this script will show them all

Get own public IP address

Returns your external IP address to the command line using only wget

Command template, executing a command over multiple files, outputing progress and fails only

This is a command template for achiving the following: * loop over files --> find -name "" | while read file; do ...; done * output progress --> echo -n . * execute some command on each file and save output for later usage --> output=$() * if command failed, open subshell and echo newline --> || (echo;...;...;) * echo output of command --> echo "$output"

Read and write to TCP or UDP sockets with common bash tools

Ever needed to test firewalls but didn't have netcat, telnet or even FTP? Enter /dev/tcp, your new best friend. /dev/tcp/(hostname)/(port) is a bash builtin that bash can use to open connections to TCP and UDP ports. This one-liner opens a connection on a port to a server and lets you read and write to it from the terminal. How it works: First, exec sets up a redirect for /dev/tcp/$server/$port to file descriptor 5. Then, as per some excellent feedback from @flatcap, we launch a redirect from file descriptor 5 to STDOUT and send that to the background (which is what causes the PID to be printed when the commands are run), and then redirect STDIN to file descriptor 5 with the second cat. Finally, when the second cat dies (the connection is closed), we clean up the file descriptor with 'exec 5>&-'. It can be used to test FTP, HTTP, NTP, or can connect to netcat listening on a port (makes for a simple chat client!) Replace /tcp/ with /udp/ to use UDP instead.

Rename all files which contain the sub-string 'foo', replacing it with 'bar'

That is an alternative to command 8368. Command 8368 is EXTREMELY NOT clever. 1) Will break also for files with spaces AND new lines in them AND for an empty expansion of the glob '*' 2) For making such a simple task it uses two pipes, thus forking. 3) xargs(1) is dangerous (broken) when processing filenames that are not NUL-terminated. 4) ls shows you a representation of files. They are NOT file names (for simple names, they mostly happen to be equivalent). Do NOT try to parse it. Why? see this :http://mywiki.wooledge.org/ParsingLs Recursive version: $ find . -depth -name "*foo*" -exec bash -c 'for f; do base=${f##*/}; mv -- "$f" "${f%/*}/${base//foo/bar}"; done' _ {} +

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" }

Change the console keyboard layout

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