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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 29
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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Find pages returning 404 errors in apache logs

Finds the top ten pages returning an http response code of 404 in an apache log.

Check whether laptop is running on battery or cable

MPD + Digitally Imported

1.- Enter into the playlist path. 2.- Run the command. 3.- Playlists created!

List all commands present on system

download a list of urls

Change Title of Terminal Window to Verbose Info useful at Login

I usually have 5 or more ssh connections to various servers, and putting this command in my .bash_profile file makes my putty window or x terminal window title change to this easily recognizable and descriptive text. Includes the username, group, server hostname, where I am connecting from (for SSH tunneling), which device pts, current server load, and how many processes are running. You can also use this for your PROMPT_COMMAND variable, which updates the window title to the current values each time you exec a command. I prefix running this in my .bash_profile with $ [[ ! -z "$SSH_TTY" ]] && which makes sure it only does this when connecting via SSH with a TTY. Here's some rougher examples from http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html $ # If set, the value is executed as a command prior to issuing each primary prompt. $ #H=$((hostname || uname -n) 2>/dev/null | sed 1q);W=$(whoami) $ #export PROMPT_COMMAND='echo -ne "\033]0;${W}@${H}:${PWD/#$HOME/~} ${SSH_TTY/\/dev\//} [`uptime|sed -e "s/.*: $[^,]*$.*/\1/" -e "s/ //g"`]\007"' $ #PROMPT_COMMAND='echo -ne "\033]0;`id -un`:`id -gn`@`hostname||uname -n 2>/dev/null|sed 1q` `command who -m|sed -e "s%^.* $pts/[0-9]*$.*($.*$)%[\1] (\2)%g"` [`uptime|sed -e "s/.*: $[^,]*$.*/\1/" -e "s/ //g"` / `command ps aux|wc -l`]\007"' $ #[[ -z "$SSH_TTY" ]] || export PROMPT_COMMAND $ #[[ -z "$SSH_TTY" ]] && [[ -f /dev/stdout ]] && SSH_TTY=/dev/stdout And here's a simple function example for setting the title: $ function set_window_title(){ echo -e "\033]0; ${1:-$USER@$HOST - $SHLVL} \007"; }

Pimp your less

# s = combine multiple lines of whitespace into 1 # x4 = set the tabstop to 4 instead of 8 # F = Exit if the output fits on 1 screen. This is similar to git diff # R = Raw control chars. This allows you to pipe colordiff straight to less. ie: alias sdi="svn diff | colordiff | less" # S = Chop off long lines # X = Dont send termcap init and deinit scrings to the terminal

Read a keypress without echoing it

This shell snippet reads a single keypress from stdin and stores it in the $KEY variable. You do NOT have to press the enter key! The key is NOT echoed to stdout! This is useful for implementing simple text menus in scripts and similar things.

Add to Instapaper

Adds URL to Instapaper. Usage: instapaper-add user@example.com 12345 http://www.commandlinefu.com/

subtraction between lines

It's allways strange for me to see sed and awk in the same command line if you can avoid it

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