Commands by mwgamera

Commands by mwgamera (6)

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convert from decimal to hexadecimal
This is sample output - yours may be different.
-3

hex() { echo $1 16op | dc; }

mwgamera · 2011-12-12 17:12:31 2
Join lines split with backslash at the end

Joins each line that end with backslash (common way to mark line continuation in many languages) with the following one while removing the backslash. Show Sample Output
This is sample output - yours may be different.
```
$ sed -e '/\\$/{:0;N;s/\\\n//;t0}' <<END
> Hello \\
> world!
> END
Hello world!
$ echo 'scale=70; 127/131' | bc | sed -e '/\\$/{:0;N;s/\\\n//;t0}'
.9694656488549618320610687022900763358778625954198473282442748091603053
```
9

sed -e '/\\$/{:0;N;s/\\\n//;t0}'

mwgamera · 2011-10-09 14:35:23 8
Calculate N!

More readable version of factorial calculation using standard desktop calculator instead of bc.
This is sample output - yours may be different.
0

dc -e '10 [q]sq[dd1=q1-lxx*]dsxxp'

mwgamera · 2011-02-16 19:00:21 4
Using mplayer to play the audio only but suppress the video
This is sample output - yours may be different.
9

mplayer -novideo something.mpg

mwgamera · 2010-02-27 22:25:47 3
Get length of current playlist in xmms2
This is sample output - yours may be different.
1

xmms2 list | sed -n -e '1i\0' -e 's/^.*($[0-9]*$:$[0-9]*$)$/\1 60*\2++/gp' -e '$a\60op' | dc | sed -e 's/^ *//' -e 's/ /:/g'

mwgamera · 2010-02-15 10:37:48 2
Get URLs matching some xmms2 search
This is sample output - yours may be different.
0

xmms2 info $(xmms2 mlib search '<query>' | sed -ne 's/^00*$[1-9][0-9]*$.*$/\1/p') | awk -F' = ' '$1~/ url$/{print$2}'

mwgamera · 2010-02-15 10:24:15 2

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Locate config files of the program

Locate config files of the program. May not be used for interactive programs like vim.

Share a screen session

Copy an element from the previous command

You can specify a range via '-'.

Get IP address from domain

Add page numbers to a PDF

Put this code in a bash script. The script expects the PDF file as its only parameter. It will add a header to the PDF containing the page numbers and output it to a file with the suffix "-header.pdf" Requires enscript, ps2pdf and pdftk.

convert markdown to PDF

This is the one-line version of this htmldoc + markdown combo to convert markdown formatted text to PDF files to distribute to your non-savvy project managers. http://scottnesbitt.net/ubuntublog/?p=114

Get a free shell account on a community server

Bash process substitution which curls the website 'hashbang.sh' and executes the shell script embedded in the page. This is obviously not the most secure way to run something like this, and we will scold you if you try. The smarter way would be: Download locally over SSL > curl https://hashbang.sh >> hashbang.sh Verify integrty with GPG (If available) > gpg --recv-keys 0xD2C4C74D8FAA96F5 > gpg --verify hashbang.sh Inspect source code > less hashbang.sh Run > chmod +x hashbang.sh > ./hashbang.sh

Retrieve "last modified" timestamp of web resource in UTC seconds

This command line assumes that "${url}" is the URL of the web resource. It can be useful to check the "freshness" of a download URL before a GET request.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Undo commit in Mercurial

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