Commands by ubahmapk

Commands by ubahmapk (2)

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Create a file of a given size in linux

If you're trying to create a sparse file, you can use dd by 'skip'ing to the last block instance. ls -ls shows the actual size vs. the reported size Show Sample Output
This is sample output - yours may be different.
```
ubahmapk@linux:~$ dd if=/dev/zero of=sparse_file skip=1024 bs=1024 count=1
1+0 records in
1+0 records out
1024 bytes (1.0 kB) copied, 4.6444e-05 s, 22.0 MB/s
ubahmapk@linux:~$ ls -lhs sparse
4.0K -rw-r--r-- 1 ubahmapk ubahmapk 1.0K 2010-10-23 19:25 sparse_file
```
2

dd if=/dev/zero of=sparse_file bs=1024 skip=1024 count=1

ubahmapk · 2010-10-24 00:28:34 6

Copy a file using dc3dd and watch its progress (very nice alternative to dd)

Requires the dc3dd package - available at http://dc3dd.sourceforge.net Show Sample Output

dc3dd progress=on bs=512 count=2048 if=/dev/zero of=/dev/null

ubahmapk · 2010-01-12 22:54:27 5

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keep an eye on system load changes

helps you keep watch on the load of a system, without having to stare constantly at the terminal. The -d argument to watch highlights the difference from the last run, making it easier to note how the load is fluctuating. The sed command just strips off the information about how long the box has been up, and how many users are logged in.

use vi key bindings at the command line

Send remote command output to your local clipboard

This command will copy command's output into your local clipboard

Add all unversioned files to svn

No need for grep, let awk do the match. This will not behave properly if the filenames contains whitespace, which is awk's default field separator.

check open ports without netstat or lsof

Create iso image of cd/dvd

Remove all zero size files from current directory (not recursive)

Enable cd by variable names

Usage: $ mydir=/very/long/path/to/a/dir $ cd mydir I often need to cd where no man wants to go (i.e. long path). by enabling the shell option cdable_vars, I can tell cd to assume the destination is the name of a variable.

a function to find the fastest DNS server

http://public-dns.info gives a list of online dns servers. you need to change the country in url (br in this url) with your country code. this command need some time to ping all IP in list.

Combines an arbitrary number of transparent png files into one file

This one liner; combines all sequentially numbered files; in this example IMG_0001.png to IMG_1121.png by generating the shell script, making the shell script executable and then running the shell script to combine the 1121 png into a single png file named _final.png tested on Mac OS X 10.6.3 with ImageMagick 6.5.8-0 2009-11-22 Q16 http://www.imagemagick.org

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