Change Directory and list contents in single command.

I find myself often changing to a directory and immediately performing an `ls`. This is partly habit and partly the fluid nature nature of the files I work on.  Anyway, you don't care about that...

Using an editor of your choosing open your .bashrc or .bash_profile and add the following lines:

# User defined functions
function cdl { cd $1 && echo $PWD && ll; }

Note: In the above I have aliased `ll` as ->  alias ll='ls -ASlh'
Note: You can name this whatever you choose, I just think `cdl` made sense.
Note: You can omit the echo $PWD if you don't care to see the directory path in the output. So you could do something as simple as:

# User defined functions
function cdl { cd $1 && ls; }

Save and close and then

bkarels@rev0:~$ source ~/.bashrc

Now you can use cdl (or whatever you've named it to change directory and immediately ls the contents.

Example:

bkarels@rev0:~$ cdl foo/

/home/bkarels/foo
total 328K
-rw-------   1 bkarels bkarels 156K Aug  8 09:39 sample0
-rw-------   1 bkarels bkarels 6.9K Aug  8 08:47 someFile27
-rw-r--r--   1 bkarels bkarels 4.1K Aug  7 12:07 sayWhat
drwx------   6 bkarels bkarels 4.0K Aug  8 07:37 killWindows.exe

The above example was done on Debian 7 (Wheezy) but should work on all flavors of *nix and OSX.

FIN

Connect to SMB share with terminal - Fedora20

The non-gui way to connect to your SMB share. There is likely 1000 small variations of how to do this, but this is a very simple method to get you on to the path to bigger, better, cooler...

From a terminal:
[user@localhost user] $ cd /mnt
[user@localhost mnt] $ sudo mkdir shareExample
[user@localhost mnt] $ sudo mount -o username=user //theShareLocation/shareName /mnt/shareExample/
You will likely be prompted for your passwd...
[user@localhost mnt] $ cd /mnt/shareExample
[user@localhost shareExample] $ look around, do stuff...

NOTE: If you're accessing a SMB share on windows you will like need to connect using:
[user@localhost mnt]$ sudo mount -t smbfs -o username=username //theShareLocation/shareName /mnt/shareExample/

...and when you're done:
[user@localhost mnt]$ sudo umount /mnt/shareExample

This should work on all flavors of *nix, done here on Fedora20 as that is what I'm using at the moment.

FIN

Generate SHA hash - OSX

I'll have to clean this post up later, but just to get this down.  Pulled the new Fedora 18 XFCE spin from the torrent and needed to verify it with the provided SHA256 hash.

At it's most basic:

computer:directory user$ shasum <filename>
<some_hash> <filename>

In the case below I needed a SHA256 hash so the -a arg was necessary:

computer:directory user$ shasum -a256 <filename>

<some_256_hash> <filename>

So, here is what I did - some content removed for brevity(...):

berlin:tmp bkarels$ cat Fedora-18-x86_64-Spins-CHECKSUM
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
...
95a75c...29dd6e *Fedora-18-x86_64-Live-XFCE.iso
berlin:tmp bkarels$ shasum -a256 Fedora-18-x86_64-Live-XFCE.iso
95a75c...29dd6e  Fedora-18-x86_64-Live-XFCE.iso

Checking the hash against a provided list was not as clear from the man pages.  In brief you need to use the output of a shasum as input to shasum -c.  Here you need only find 'OK' vs. relying on your human ability to visually compare hashes on a terminal.

Basic:

computer:directory user$ shasum -a 256 <filename> | shasum -c <CHECKSUM_FILE>
blah blah blah output: OK

Example:

berlin:tmp bkarels$ shasum -a 256 Fedora-18-x86_64-Live-XFCE.iso | shasum -c Fedora-18-x86_64-Spins-CHECKSUM
...
shasum: Fedora-18-x86_64-Live-Scientific-KDE.iso: No such file or directory
Fedora-18-x86_64-Live-Scientific-KDE.iso: FAILED open or read
shasum: Fedora-18-x86_64-Live-Security.iso: No such file or directory
Fedora-18-x86_64-Live-Security.iso: FAILED open or read
shasum: Fedora-18-x86_64-Live-SoaS.iso: No such file or directory
Fedora-18-x86_64-Live-SoaS.iso: FAILED open or read
Fedora-18-x86_64-Live-XFCE.iso: OKshasum: WARNING: 7 of 8 listed files could not be read

Fin.

NOTE: For clarity, here is the entire contents of the example file Fedora-18-x86_64-Spins-CHECKSUM:

berlin:tmp bkarels$ cat Fedora-18-x86_64-Spins-CHECKSUM
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
3684ae2814c7e54b4f66f0411a385846533e40f107d7fff4e331c2f547951ec2 *Fedora-18-x86_64-Live-Design-suite.iso
b11da64d527e333e2160cbf5fde49f89205f932d48fa7c01690232fc1b0cacfa *Fedora-18-x86_64-Live-Electronic-Lab.iso
ea34f626488623a1f84b2041df9c65468357bfdb878f034392da16f6c9d05264 *Fedora-18-x86_64-Live-LXDE.iso
8700aa64a6485e338b3d9aa419ecadc0c87884c77203a35c6e1847147a4dca06 *Fedora-18-x86_64-Live-Robotics.iso
3bb90d115daf6f0d2279cd5a669fb265c090cb6e88125424ae960a980f9ba50d *Fedora-18-x86_64-Live-Scientific-KDE.iso
7802a1c024f9471fba90724f53c0d95045acd76c3c4346b467cb53f5608248a9 *Fedora-18-x86_64-Live-Security.iso
736e8dd36de4207fe899648299abb6b3220fd1d1bcb48b8bf712d01d2ec02bf5 *Fedora-18-x86_64-Live-SoaS.iso
95a75c334ce82b33f1a5d81eab196600e40c7933fd5f7bfa8e6ed9534529dd6e *Fedora-18-x86_64-Live-XFCE.iso
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.11 (GNU/Linux)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=/hTc
-----END PGP SIGNATURE-----

Set tabstop in VI - Mac OSX

From within VI

(Assuming you would like to use four spaces for your tabs)
:set tabstop=4

To make this behaviour the default:

user@machine:~$ cd ~
(if ~/.exrc does not exist, create it.  Otherwise skip to next cmd.)
user@machine:~$ touch .exrc
user@machiner:~$ vi .exrc

Add the following line to the file:
set tabstop=4


Save and close .exrc

user@machine:~$ . .exrc
user@machine:~$ vi someTextFile.txt

Basically, if the file .exrc does not exist in your home directory create it.
Open .exrc for editing.
Add the line (w/o quotes) "set tabstop=4"
Save .exrc
Source .exrc
Test to verify function.

This should also work in most flavors of *nix.

~Fin

mkdir and cd to created directory with a single command - 11.04 Natty

Not a fan of having to cd to the directory you just created? You likely created it for a reason and 8 times out of 10 not need to cd to it immediately anyway. So, you do this:

user@machine:~$ mkdir -p /dir/needed/to/cd/to/immediately
user@machine:~$ cd /dir/needed/to/cd/to/immediately
user@machine:~$ pwd
/home/user/dir/needed/to/cd/to/immediately

Quick functional solution: Open ~/.bashrc (or .bash_profile) and add the following line:

function mkdircd () { mkdir -p "$@" && eval cd "\"\$$#\""; }

NOTE: You can name this function whatever you like, mkdircd just makes sense to me...

Source ~/.bashrc and now let's do this the easy way:

user@machine:~$ mkdircd dir/needed/to/go/to/immediately
user@machine:~/dir/needed/to/go/to/immediately$ pwd
/home/user/dir/needed/to/go/to/immediately

~Fin