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Commands by claudelepoisson

Commands by claudelepoisson from sorted by
Terminal - Commands by claudelepoisson - 7 results
x=1024; y=32768; cat <(echo -e "P5\n$x $y\n255\n") <(dd if=/dev/sda1 bs=$x count=$y) > sda1.pgm
2012-03-06 03:09:16
User: claudelepoisson
Functions: cat dd echo
Tags: dd images pnm pgm
1
Up
Down
Look at your data as a greymap image.

Keep width to a power of 2 to see patterns emerge. 512 is good. So is 4096 for huge maps.

PNM headers are super basic.

http://netpbm.sourceforge.net/doc/pbm.html

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command <<< word
2012-02-29 03:14:54
User: claudelepoisson
Functions: command
Tags: bash stdin
6
Up
Down
This is how you should push a string in a command's stdin.

Don't do this:

echo word | command

Using a bash "here strings" and "here documents" look leeter than piping echo into the command. Also prevents subshell execution. Word is also expanded as usual.

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for ((x=0;;x+=5)); do sleep 5; espeak $x & done
2012-02-22 00:26:57
User: claudelepoisson
Functions: sleep
Tags: audio bash timer
5
Up
Down
Have your sound card call out elapsed time.

Useful contexts :

You are doing yoga or some other physical training in which you are holding a position.

Or you practice the pomodoro productivity technique.

Or your girlfriend said "We're leaving in 40 minutes".

Design details:

sleep executes before espeak to give you a 5 seconds head start.

espeak is run in the background so it doesn't mess up the timing.

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find -maxdepth 1 -mtime 0 -type f
2010-07-30 01:56:34
User: claudelepoisson
Functions: find
Tags: find today mtime
0
Up
Down
LIST FILENAMES OF FILES CREATED TODAY IN CURRENT DIRECTORY

Then pipe to 'xargs ls' for a familiar listing, possibly using find's -print0 and xarg's -0 options.

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echo "export DISPLAY=:0; export XAUTHORITY=~/.Xauthority; notify-send test" | at now+1minute
2010-07-27 00:10:08
User: claudelepoisson
Functions: at echo
Tags: notify-send
18
Up
Down
I finally found out how to use notify-send with at or cron

You can write a script that does this :

remind <minutes> [<message>]
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<ctrl+u> [...] <ctrl+y>
2010-07-23 03:33:46
User: claudelepoisson
Tags: bash readline undo key sequence
82
Up
Down
type partial command, kill this command, check something you forgot, yank the command, resume typing.

Example :

vim /etc/fstab

## damn

<ctrl+u> sudo <ctrl+y>

## like a boss.

Example 2 :

sudo vim /root/bin/

##uh... autocomplete doesn't work...

<ctrl+u> sudo ls /root/bin

##ah! that's the name of the file!

<ctrl+y> sudo vim /root/bin/ ##resume here! Thanks readline!
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ls -l `which foo`
2010-07-09 01:34:02
User: claudelepoisson
Functions: ls
Tags: which ls link executable
1
Up
Down
Tells you where a command is in your $PATH, but also wether it's a link and to what.

You may also use the $(which foo) variant instead of backticks. I personnaly have an alias ll='ls -l'.

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