Commands by fernandomerces

Commands by fernandomerces (5)

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Check SSH public and private keys matching

Tested in bash4
This is sample output - yours may be different.
2

diff <(ssh-keygen -y -f ~/.ssh/id_rsa) <(cut -d' ' -f1,2 ~/.ssh/id_rsa.pub)

fernandomerces · 2013-08-31 14:01:33 8
Bingo-like raffle

Random choose numbers from 1 to 100 with 5 seconds interval without duplicates. Show Sample Output
This is sample output - yours may be different.
```
67
92
40
13
43
97
```
3

for i in $(seq 1 100 | sort -R); do echo $i; sleep 5; done

fernandomerces · 2012-09-25 17:47:32 32
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.
This is sample output - yours may be different.
4

echo -e "\e[32m"; while :; do printf '%*c' $(($RANDOM % 30)) $(($RANDOM % 2)); done

fernandomerces · 2012-09-25 17:36:25 5
Fast file backup

This is a BASH feature. The above command will create a backup of "filename" called "filename.DATE", where DATE is the actual day in %Y%m%d (year, month and day numbers together) format.
This is sample output - yours may be different.
6

cp filename{,.`date +%Y%m%d`}

fernandomerces · 2011-04-02 06:41:26 5
Test a SSLv2 connection

Test for weak SSL version. Show Sample Output
This is sample output - yours may be different.
```
CONNECTED(00000003)
```
1

openssl s_client -connect localhost:443 -ssl2

fernandomerces · 2011-04-02 06:34:39 6

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Makes you look busy

This makes an alias for a command named 'busy'. The 'busy' command opens a random file in /usr/include to a random line with vim. Drop this in your .bash_aliases and make sure that file is initialized in your .bashrc.

list files recursively by size

Generate random valid mac addresses

Doubt it actually generates valid mac addresses but this version doesn't need any external commands so it runs much faster. Much shorter as well.

List out classes in of all htmls in directory

Lists out all classes used in all *.html files in the currect directory. usefull for checking if you have left out any style definitions, or accidentally given a different name than you intended. ( I have an ugly habit of accidentally substituting camelCase instead of using under_scores: i would name soemthing counterBox instead of counter_box) WARNING: assumes you give classnames in between double quotes, and that you apply only one class per element.

Create a tar archive using xz compression

Compress files or a directory to xz format. XZ has superior and faster compression than bzip2 in most cases. XZ is superior to 7zip format because it can save file permissions and other metadata data.

Insert a line at the top of a text file without sed or awk or bash loops

Yet another way to add a line at the top a of text file with the help of the tac command (reverse cat).

Shows size of dirs and files, hidden or not, sorted.

Enhanced version: fixes sorting by human readable numbers, and filters out non MB or GB entries that have a G or an M in their name.

fast access to any of your favorite directory.

example: -------------------------------------------------------------------------------------------- user@ubuntu:~/workspace/SVN/haystak-repos/trunk/internal/src$ addpi -------------------------------------------------------------------------------------------- Now that directory is in the list of fast access directories. You can switch to it anytime like this: -------------------------------------------------------------------------------------------- user@ubuntu:~$ pi internal` user@ubuntu:~/workspace/SVN/haystak-repos/trunk/internal/src$ -------------------------------------------------------------------------------------------- Please note the backquote ( the symbol that shares its key with ~ in the keyboard ) pi will switch you to that directory. To see the list of all fast access directories you have to say "cat ~/.pi"

List recorded formular fields of Firefox

When you fill a formular with Firefox, you see things you entered in previous formulars with same field names. This command list everything Firefox has registered. Using a "delete from", you can remove anoying Google queries, for example ;-)

know the current running shell (the true)

Return the current shell. It is better than print $SHELL which can sometimes return a false value.

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