Commands by totti

Commands by totti (87)

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Identify files uniquly in a FS with inode numer
This is sample output - yours may be different.
-2

ls -i1 filename

totti · 2011-09-15 19:42:40 5
Watch end of files real time, especially log files

Changes are displayed when they are written to the file to exit Show Sample Output
This is sample output - yours may be different.
```
$ tail -f /home/ubuntu/.bash_history 
uptime 
echo hello
exit
```
-1

tail -f ~/.bash_history

totti · 2011-09-15 19:35:09 4
Go to the Nth line of file [text editor]

This is not printing, real editing using the text editor.
This is sample output - yours may be different.
1

vi +4 /etc/mtab

totti · 2011-09-15 19:18:00 8
Print all lines from a file that has the same N th and M th column
This is sample output - yours may be different.
0

awk '$3==$4' /etc/passwd

totti · 2011-09-15 19:13:18 6
Convert windows text file to linux text document
This is sample output - yours may be different.
-1

sed 's/.$//' Win-file.txt

totti · 2011-09-15 19:07:51 5
close stderr
This is sample output - yours may be different.
-3

cat aaaaaa 2>&-

totti · 2011-09-14 20:55:26 4
Number file
This is sample output - yours may be different.
2

nl file.txt > file_numbered.txt

totti · 2011-09-14 20:10:49 5
Substrings a variable

substrings a variable starting at position. If no offset given prints rest of the line Show Sample Output
This is sample output - yours may be different.
```
~$ var='123456789'; echo ${var:4}
56789

~$ var='123456789'; echo ${var:4:2}
56
```
12

var='123456789'; echo ${var:<start_pos>:<offset>}

totti · 2011-09-14 20:05:17 37
Substitute an already running command

eg: Already running cmd sleep 120 Substitution cmd c=$(pgrep sleep) && sleep 5 && kill $c
This is sample output - yours may be different.
1

c=$(pgrep <cmd>) && <new_cmd> && kill $c

totti · 2011-09-14 19:58:30 4
Binary difference of two files

Upload/download newer version of any file with less size and high speed. To remake the new file use bspatch <oldfile> <newfile> <patchfile>
This is sample output - yours may be different.
7

bsdiff <oldfile> <newfile> <patchfile>

totti · 2011-09-13 18:22:40 7
Common key binding for 'less' to search for a string

Use the following key binding to search ---------------------------------------------------------------- ng : Jump to line number n. Default is the start of the file. nG : Jump to line number n. Default is the end of the file. /pattern : Search for pattern. Regular expressions can be used. [/ = slash] Press / and then Enter to repeat the previous search pattern. Press ESC and then u to undo search highlighting. n : Go to next match (after a successful search). N : Go to previous match. mletter : Mark the current position with letter. 'letter : Return to position letter. [' = single quote] '^ or g : Go to start of file. '$ or G : Go to end of file. s : Save current content (got from another program like grep) in a file. = or Ctrl+g : File information. F : continually read information from file and follow its end. Useful for logs watching. Use Ctrl+c to exit this mode. -option : Toggle command-line option -option. h : Help.
This is sample output - yours may be different.
-4

less file.ext

totti · 2011-09-13 10:29:27 9
How long has this disk been powered on
This is sample output - yours may be different.
1

smartctl -A /dev/sda | grep Power_On_Hours

totti · 2011-09-09 20:29:46 4
Convert phone book VCARD to text
This is sample output - yours may be different.
0

tr -d "\r" < file.vcf | tr "\0" " " > file.vcf.txt

totti · 2011-09-09 19:21:44 12
Convert windows text file to linux text document
This is sample output - yours may be different.
0

tr -d "\r" < dos.txt > linux.txt

totti · 2011-09-09 18:53:34 4
Batch resize image to exact given resolution ignoring aspect ratio

- Backup data before reszie as it over write original -To preserve aspect ratio remove !
This is sample output - yours may be different.
0

mogrify -resize 600x800! *.jpg

totti · 2011-09-09 18:19:59 4
print all characters of any file in human readble form using hexdump

- View non printable characters. - view binary files Show Sample Output
This is sample output - yours may be different.
```
0000000   B   E   G   I   N   :   V   C   A   R   D  \r  \n   V   E   R
0000010   S   I   O   N   :   2   .   1  \r  \n   N   ;   C   H   A   R
0000020   S   E   T   =   U   T   F   -   8   ;   E   N   C   O   D   I
```
0

hexdump -c <file>

totti · 2011-09-09 09:54:16 4
Gets the english pronunciation of a phrase

No need to install additional packages eg: say hello For multiword say how+are+you
This is sample output - yours may be different.
0

say() { wget -q -U Mozilla -O output.mp3 "http://translate.google.com/translate_tts?tl=en&q=$1"; gnome-terminal -x bash -c "totem output.mp3"; sleep 4; totem --quit;}

totti · 2011-09-07 19:48:53 4
Get rid from a blank display without reboot

Killall5 will kill your session and redirect to login screen. -Very useful when suffering display problems. -Can use F1-F6 -Need to login in the particular console if not already
This is sample output - yours may be different.
1

<Ctrl><Alt><F6> killall5

totti · 2011-09-07 19:19:34 7
Text message on wallpaper

Display some text on the wallpaper especially warning messages
This is sample output - yours may be different.
1

wallpaperWarn() { BG="/desktop/gnome/background/picture_filename"; convert "`gconftool-2 -g $BG`" -pointsize 70 -draw "gravity center fill red text 0,-360 'Warn' fill white text 0,360 'Warn'" /tmp/w.jpg; gconftool-2 --set $BG -t string "/tmp/w.jpg"; }

totti · 2011-09-07 19:00:40 6
Text to image with transparent background

Create transparent image to use as icon, watermark for other images, etc.
This is sample output - yours may be different.
1

convert -background none -pointsize 55 label:"`whoami`" me.png

totti · 2011-09-07 17:06:38 4
Print just line 4 from a textfile

d --> delete !d ---> delete others
This is sample output - yours may be different.
-1

sed '4!d'

totti · 2011-09-05 17:54:57 4
Uptime in minute

Want to run scripts/programs in the system after starting X minute [ For letting the system to free ]? This will give uptime in minute.
This is sample output - yours may be different.
1

bc <<< `uptime | sed -e 's/^.*up //' -e 's/[^0-9:].*//' | sed 's/:/*60+/g'`

totti · 2011-08-29 10:24:43 39
Read/Write output/input from sed to a file

Can't print correctly in the command field. There is a new line before } as follows seq 20 | sed -n '5,6 { w out.txt }' Show Sample Output
This is sample output - yours may be different.
```
$ seq 20 | sed  -n '5,6 { w out.txt 
}'

$ cat out.txt
5
6
```
0

seq 20 | sed '5,6 { w out.txt }' #Can't print correctly. See sample output

totti · 2011-08-29 10:17:47 4
last mounted device
This is sample output - yours may be different.
-3

mount |tail -1 | less -p "/dev/[^ ]*"

totti · 2011-08-28 16:29:42 6
shut of the screen ( Fool proof )

Use the command to create a script and bind it to a key using keyboard shortcut. eg: Script locks the screen in a loop until the command is executed again.At first it
This is sample output - yours may be different.
1

switchMonitor () { LF=/tmp/screen-lock; if [ -f $LF ]; then rm $LF; else touch $LF; sleep .5; while [ -f $LF ]; do xset dpms force off; sleep 2; done; fi };

totti · 2011-08-26 17:55:44 7
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Binary digits Matrix effect

Prints 0's and 1's in The Matrix style. You can easily modify to print 0-9 digits using $RANDOM %10 insted of %2.

Short Information about loaded kernel modules

Liked command 4077 so I improved it, by doing all text manipulation with sed. "Run this as root, it will be helpful to quickly get information about the loaded kernel modules." THX mohan43u

File rotation without rename command

Rotates log files with "gz"-extension in a directory for 7 days and enumerates the number in file name. i.e.: logfile.1.gz > logfile.2.gz I needed this line due to the limitations on AIX Unix systems which do not ship with the rename command.

Quickly add a new user to all groups the default user is in

This is a standard procedure for me, whenever I set up a new Raspberry Pi system. Because the default user is "pi", I quickly replace it with my own (e.g. "kostis"), but I have to substitute that user to all of pi's groups first, before deleting the default account. xargs helps a lot with that in a single line, while avoiding boring "for" loops. For everything trickier, there's always "parallel" :)

count files by type

displays a list of all file extensions in current directory and how many files there are of each type of extension in ascending order (case insensitive)

list all file-types (case-insensitive extensions) including subdirectories

Completely wipe all data on your Synology NAS and reinstall DSM. (BE CAREFUL)

Fork bomb (don't actually execute)

Retrieved from: https://en.wikipedia.org/wiki/Fork_bomb More info: http://stackoverflow.com/questions/991142/how-does-this-bash-fork-bomb-work

Resize an image to at least a specific resolution

This command will resize an image (keeping the aspect ratio) to a specific resolution, meaning the resulting image will never be smaller than this resolution. For example, if we have a 2048x1000 image, the output would be 1229x600, not 1024x600 or 1024x500. Same thing for the height, if the image is 2000x1200, the output would be 1024x614.

quickly formats a fat partition. usefull for flash drives

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