Troca de conhecimentos sobre o uso da linha de comando e referencia direta ao site commandlinefu.com.
Define a quick calculator function
29 de Junho de 2009, 0:00 - sem comentários ainda$ ? () { echo "$*" | bc -l; }
defines a handy function for quick calculations from cli.
once defined:
? 10*2+3 (by fizz)
by David Winterbottom (codeinthehole.com)
Create a system overview dashboard on F12 key
25 de Junho de 2009, 0:00 - sem comentários ainda$ bind '"\e[24~"':"\"ps -elF;df -h;free -mt;netstat -lnpt;who -a\C-m"""
Command binds a set of commands to the F12 key.
Feel free to alter the dashboard according to your own needs.
How to find the key codes?
Type
read
Then press the desired key (example: F5)
^[[15~
Try
bind '"\e[15~"':"\"ssh su@ip-address\C-m"""
or
bind '"\e[16~"':"\"apachectl -k restart\C-m""" (by Neo23x0)
by David Winterbottom (codeinthehole.com)
Multiple SSH Tunnels
25 de Junho de 2009, 0:00 - sem comentários ainda$ ssh -L :: -L :: @
Thankfully, the ssh command allows you to specify multiple tunnels through the same server in one command.
Remeber if you want a priviliged port on your machine, you must use root or sudo account.
(by starchox)
by David Winterbottom (codeinthehole.com)
Reuse all parameter of the previous command line
23 de Junho de 2009, 0:00 - sem comentários ainda$ !*
!* is all of the arguments to the previous command rather than just the last one.
This is useful in many situations.
Here's a simple example:
vi cd /stuff
oops!
[exit vi, twice]
!*
expands to: cd /stuff
Options:
commandlinefu.com by David Winterbottom
Display a cool clock on your terminal
21 de Junho de 2009, 0:00 - sem comentários ainda$ watch -t -n1 "date +%T|figlet"
This command displays a clock on your terminal which updates the time every second. Press Ctrl-C to exit.
A couple of variants:
A little bit bigger text:
watch -t -n1 "date +%T|figlet -f big"
You can try other figlet fonts, too.
Big sideways characters:
watch -n 1 -t '/usr/games/banner -w 30 $(date +%M:%S)'
This requires a particular version of banner and a 40-line terminal or you can adjust the width ("30" here).
Options:
commandlinefu.com by David Winterbottom
Inserts the results of an autocompletion in the command line
15 de Junho de 2009, 0:00 - sem comentários ainda$ ESC *
Pressing ESC then * will insert in the command line the results of the autocompletion.
It's hard to explain but if you look the sample output or do
echo ESC *
you will understand quickly.
By the way, few reminders about ESC :
- Hold ESC does the same thing as tab tab
- 'ESC .' inserts the last argument of last command (can be done many times in order to get the last argument of all previous commands)
Options:
commandlinefu.com by David Winterbottom
Open Finder from the current Terminal location
10 de Junho de 2009, 0:00 - sem comentários ainda$ open .
I did not know this, i'd like to share...
Options:
commandlinefu.com by David Winterbottom
Save an HTML page, and covert it to a .pdf file
10 de Junho de 2009, 0:00 - sem comentários ainda$ wget $URL -O page.html ; htmldoc --webpage -f page.pdf page.html; xpdf page.pdf &
Uses htmldoc to perform the conversion
Options:
commandlinefu.com by David Winterbottom
DELETE all those duplicate files but one based on md5 hash comparision in the current directory tree
10 de Junho de 2009, 0:00 - sem comentários ainda$ find . -type f -print0|xargs -0 md5sum|sort|perl -ne 'chomp;$ph=$h;($h,$f)=split(/\s+/,$_,2);print "$f"."\x00" if ($h eq $ph)'|xargs -0 rm -v --
This one-liner will the *delete* without any further confirmation all 100% duplicates but one based on their md5 hash in the current directory tree (i.e including files in its subdirectories).
Good for cleaning up collections of mp3 files or pictures of your dog|cat|kids|wife being present in gazillion incarnations on hd.
md5sum can be substituted with sha1sum without problems.
The actual filename is not taken into account-just the hash is used.
Whatever sort thinks is the first filename is kept.
It is assumed that the filename does not contain 0x00.
As per the good suggestion in the first comment, this one does a hard link instead:
find . -xdev -type f -print0 | xargs -0 md5sum | sort | perl -ne 'chomp; $ph=$h; ($h,$f)=split(/\s+/,$_,2); if ($h ne $ph) { $k = $f; } else { unlink($f); link($k, $f); }'
Options:
commandlinefu.com by David Winterbottom
Record a screencast and convert it to an mpeg
8 de Junho de 2009, 0:00 - sem comentários ainda$ ffmpeg -f x11grab -r 25 -s 800x600 -i :0.0 /tmp/outputFile.mpg
Grab X11 input and create an MPEG at 25 fps with the resolution 800x600
Options:
commandlinefu.com by David Winterbottom
