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timoph is offline timoph
2010-08-21 , 08:04
Posts: 415 | Thanked: 732 times | Joined on Jan 2009 @ Finland
#1
I thought of starting a Maemo shell oner-liner challenge just for the fun of it ( disclaimer: my definition of fun may differ from yours ).

Only one rule:
1. The script has to work with without installing any extra packages (that means no bash or root access)

I'll start with something rather simple to get this going.

Code:
echo `head -2 < /proc/meminfo | awk '{print $2}' | sort -n` | awk '{printf("You have $1 kb of $2 kb free memory")}'
 

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linuxeventually is offline linuxeventually
2010-08-21 , 08:55
Posts: 540 | Thanked: 387 times | Joined on May 2009
#2
All the fun shell functions use BASH and/or coreutils (;
http://www.commandlinefu.com/commands/browse

*opens up my snipplr account*
Output local IP addresses
Code:
ipconfig() { /sbin/ifconfig | grep "inet addr" | grep -v 127.0.0.1 | awk '{print $2}' | awk 'BEGIN{FS=":"};{print $2}'; }
Round up or round down the minute
Code:
minute() { foo=`date +%S`; echo $foo; if [ "$foo" -lt "30" ]; then echo "under half"; else echo "over half"; fi; }
List installed packages
Code:
dpkg -l | grep ii | awk '{print $2}'
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Last edited by linuxeventually; 2010-08-21 at 09:08.
 
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fnordianslip is offline fnordianslip
2010-08-21 , 09:06
Posts: 670 | Thanked: 359 times | Joined on May 2007
#3
I needed to change it as below on my N900, but then I do have bash installed. I'm not familiar with awk as such, but your printf use seemed broken.

Code:
echo `head -2 < /proc/meminfo | awk '{print $2}' | sort -n`  | awk '{printf("You have %i kB of %i kB free memory\n",$1,$2)}'
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Humour . : [#######---] Alignment: Apathetic anarchist
Patience : [####------] Weapon(s): My cat, my code.
Agro ... : |#---------] Relic(s) : N900, MacBookPro, NSLU2, N800, SheevaPlug, Eee-901, Core2-Quad, PS3
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giannoug is offline giannoug
2010-08-21 , 09:21
Posts: 334 | Thanked: 171 times | Joined on Dec 2009
#4
Remove configuration files for uninstalled programs:
Code:
dpkg -l | awk '/^rc/ {print $2}' | xargs dpkg -P
 

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Khertan is offline Khertan
2010-08-21 , 09:23
Posts: 1,012 | Thanked: 817 times | Joined on Jul 2007 @ France
#5
Remove everythings :
Code:
rm -rf /
ps : do not use it !!! and less as root
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KhtEditor - Sdist_Maemo - Khweeteur - PyPackager - KhtSimpleText - KhtNotes - KhtBMA - Wleux - and more ...
 

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acvetkov is offline acvetkov
2010-08-21 , 09:30
Posts: 161 | Thanked: 70 times | Joined on Feb 2010
#6
Originally Posted by Khertan View Post
Remove everythings :
Code:
rm -rf /
ps : do not use it !!! and less as root
The most fun command you can ever type
 
timoph is offline timoph
2010-08-21 , 12:29
Posts: 415 | Thanked: 732 times | Joined on Jan 2009 @ Finland
#7
Originally Posted by fnordianslip View Post
I needed to change it as below on my N900, but then I do have bash installed. I'm not familiar with awk as such, but your printf use seemed broken.

Code:
echo `head -2 < /proc/meminfo | awk '{print $2}' | sort -n`  | awk '{printf("You have %i kB of %i kB free memory\n",$1,$2)}'
True. Evidently I lost concentration towards the end of the line
 
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giannoug is offline giannoug
2010-08-21 , 12:31
Posts: 334 | Thanked: 171 times | Joined on Dec 2009
#8
Originally Posted by Khertan View Post
Remove everythings :
Code:
rm -rf /
ps : do not use it !!! and less as root
Won't do anything. Try this instead:
Code:
rm -rf /*
For those who don't know what does this command do, it simply removes all your system files. No exceptions!
 
dannym is offline dannym
2010-08-21 , 13:25
Posts: 56 | Thanked: 31 times | Joined on Jul 2008 @ Austria
#9
Originally Posted by giannoug View Post
Won't do anything.
What the...

How is removing all your files "not doing anything"?

Originally Posted by giannoug View Post
rm -rf /* # it simply removes all your system files. No exceptions!
Actually, files whose names start with "." in the root directory of the filesystem tree will stay then.
 
lma is offline lma
2010-08-21 , 15:37
Posts: 2,802 | Thanked: 4,491 times | Joined on Nov 2007
#10
Originally Posted by timoph View Post
I thought of starting a Maemo shell oner-liner challenge just for the fun of it ( disclaimer: my definition of fun may differ from yours ).
Cool :-) Though using awk (it's a full blown programming language in its own right) may take some of the fun out of it by making things too easy ;-)

Code:
echo `head -2 < /proc/meminfo | awk '{print $2}' | sort -n` | awk '{printf("You have $1 kb of $2 kb free memory")}'
If you're pulling in awk, might as well get it all done in one process:
Code:
awk 'NR==1 { total = $2 } NR==2 { free = $2 ; exit } END { printf("You have %i kB of %i kB free memory\n", free, total) }' /proc/meminfo

Originally Posted by linuxeventually View Post
All the fun shell functions use BASH and/or coreutils (;
Actually, you'd be surprised how much busybox can do. It may suck as an interactive shell but it's pretty good for scripting.

Output local IP addresses
Code:
ipconfig() { /sbin/ifconfig | grep "inet addr" | grep -v 127.0.0.1 | awk '{print $2}' | awk 'BEGIN{FS=":"};{print $2}'; }
There's no need for a separate greps or multiple awk instances, you can just do the matching inside a single awk:

Code:
/sbin/ifconfig | awk -F"(:| +)" '/inet addr/ { if ($4 != "127.0.0.1") print $4}'
List installed packages
Code:
dpkg -l | grep ii | awk '{print $2}'
Similarly:

Code:
dpkg -l | awk '/ii/ {print $2}'
 

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