Maiar's Vault

erlang module load path how to ERL_LIBS

2011-07-15T01:41:00.000-04:00

erl -env ERL_LIBS "/my/path/to/module"
export ERL_LIBS=/my/path/to/module
erl -pa /my/path/to/module

erlc -o /dir/to/save/compiled/file mymodule.erl

NOTE:Modules must reside in a file with the same name as the file.

NOTE:the lib path will not load if it doesn't contain a ebin dir
Example:
/Users/joe/mymodule/ebin

$ export ERL_LIBS=/Users/joe/mymodule; erl

You can test to see if the path loaded with
>code:get_path().

Bash has a Vi mode

2011-07-14T02:14:00.002-04:00

Must be a very well kept secret "BASH HAS A VI MODE".

set -o vi
set -o emacs

How I have never come across this before is beyond me

http://www.catonmat.net/blog/bash-vi-editing-mode-cheat-sheet/

http://www.catonmat.net/download/bash-vi-editing-mode-cheat-sheet.pdf

mongodb mongod command line args

2011-06-10T03:15:00.000-04:00

smorin$ ./mongod --dbpath ../../mongodata/ --help
Allowed options:

General options:
-h [ --help ] show this usage information
--version show version information
-f [ --config ] arg configuration file specifying additional options
-v [ --verbose ] be more verbose (include multiple times for more
verbosity e.g. -vvvvv)
--quiet quieter output
--port arg specify port number
--bind_ip arg comma separated list of ip addresses to listen on -
all local ips by default
--logpath arg log file to send write to instead of stdout - has to
be a file, not directory
--logappend append to logpath instead of over-writing
--pidfilepath arg full path to pidfile (if not set, no pidfile is
created)
--keyFile arg private key for cluster authentication (only for
replica sets)
--unixSocketPrefix arg alternative directory for UNIX domain sockets
(defaults to /tmp)
--fork fork server process
--auth run with security
--cpu periodically show cpu and iowait utilization
--dbpath arg directory for datafiles
--diaglog arg 0=off 1=W 2=R 3=both 7=W+some reads
--directoryperdb each database will be stored in a separate directory
--journal enable journaling
--journalOptions arg journal diagnostic options
--ipv6 enable IPv6 support (disabled by default)
--jsonp allow JSONP access via http (has security
implications)
--maxConns arg max number of simultaneous connections
--noauth run without security
--nohttpinterface disable http interface
--noprealloc disable data file preallocation - will often hurt
performance
--noscripting disable scripting engine
--notablescan do not allow table scans
--nounixsocket disable listening on unix sockets
--nssize arg (=16) .ns file size (in MB) for new databases
--objcheck inspect client data for validity on receipt
--profile arg 0=off 1=slow, 2=all
--quota limits each database to a certain number of files (8
default)
--quotaFiles arg number of files allower per db, requires --quota
--rest turn on simple rest api
--repair run repair on all dbs
--repairpath arg root directory for repair files - defaults to dbpath
--slowms arg (=100) value of slow for profile and console log
--smallfiles use a smaller default file size
--syncdelay arg (=60) seconds between disk syncs (0=never, but not
recommended)
--sysinfo print some diagnostic system information
--upgrade upgrade db if needed

Replication options:
--fastsync indicate that this instance is starting from a dbpath
snapshot of the repl peer
--autoresync automatically resync if slave data is stale
--oplogSize arg size limit (in MB) for op log

Master/slave options:
--master master mode
--slave slave mode
--source arg when slave: specify master as
--only arg when slave: specify a single database to replicate
--slavedelay arg specify delay (in seconds) to be used when applying
master ops to slave

Replica set options:
--replSet arg arg is [/]

Sharding options:
--configsvr declare this is a config db of a cluster; default port
27019; default dir /data/configdb
--shardsvr declare this is a shard db of a cluster; default port
27018
--noMoveParanoia turn off paranoid saving of data for moveChunk. this
is on by default for now, but default will switch

mongodb mongo command line args

2011-06-10T03:14:00.002-04:00

smorin$ ./bin/mongo --help
MongoDB shell version: 1.8.1
usage: ./bin/mongo [options] [db address] [file names (ending in .js)]
db address can be:
foo foo database on local machine
192.169.0.5/foo foo database on 192.168.0.5 machine
192.169.0.5:9999/foo foo database on 192.168.0.5 machine on port 9999
options:
--shell run the shell after executing files
--nodb don't connect to mongod on startup - no 'db address'
arg expected
--quiet be less chatty
--port arg port to connect to
--host arg server to connect to
--eval arg evaluate javascript
-u [ --username ] arg username for authentication
-p [ --password ] arg password for authentication
-h [ --help ] show this usage information
--version show version information
--verbose increase verbosity
--ipv6 enable IPv6 support (disabled by default)

file names: a list of files to run. files have to end in .js and will exit after unless --shell is specified

redis redis-cli command line options

2011-06-10T03:02:00.000-04:00

There isn't official documentation for the command line arguments as of redis-cli. If you type --help for the command line arguments you get the following

smorin$ ./redis-2.2.4//src/redis-cli --help
redis-cli 2.2.4

Usage: redis-cli [OPTIONS] [cmd [arg [arg ...]]]
-h Server hostname (default: 127.0.0.1)
-p Server port (default: 6379)
-s Server socket (overrides hostname and port)
-a Password to use when connecting to the server
-r Execute specified command N times
-n Database number
-x Read last argument from STDIN
-d Multi-bulk delimiter in for raw formatting (default: \n)
--raw Use raw formatting for replies (default when STDOUT is not a tty)
--help Output this help and exit
--version Output version and exit

Examples:
cat /etc/passwd | redis-cli -x set mypasswd
redis-cli get mypasswd
redis-cli -r 100 lpush mylist x

When no command is given, redis-cli starts in interactive mode.
Type "help" in interactive mode for information on available commands.

redis redis-server command line options

2011-06-10T02:57:00.000-04:00

There is only one argument for redis-server. It's the path to the redis.conf file. There is a example of this file in the redis src base. There isn't a official documentation page as of 6/2011

$redis-server /path/to/redis/config/redis.conf

sbcl access command line arguments

2011-04-09T16:15:00.003-04:00

$ sbcl --eval '(progn (print *posix-argv*)(quit))' two three

git delete remote branch

2011-03-25T19:32:00.000-04:00

This is a simple example where the branch has the same name locally and remotely

To create a remote branch
git push origin newbranchname

To delete a remote branch
git push origin :newbranchname

Bash script locate base dir

2011-02-18T02:52:00.000-05:00

BASEDIR=$(cd $(dirname $0); cd ../ ; pwd -P)

Bash script locate self

2011-02-18T02:50:00.002-05:00

SELF=$(cd $(dirname $0); pwd -P)/$(basename $0)

emacs emulating vi open line below

2011-02-18T02:39:00.000-05:00

Quoted from Stackoverflow - Original Link Below ( love this post, these three are my biggest emacs annoyences)

Hi there,

I am currently playing around with emacs and happy with most of the concepts. But I really adored the convenience of the three vim commands: dd,o,O Hopefully you can tell me how to mirror them in emacs :)

dd - deletes whole line, including newline, no matter where the cursor is.

I found something similar to do the trick:

C-a C-k C-k

While C-a moves the cursor to the beginning of the line, the first C-k kills the text, the second one kills the newline. The only problem is that this is not working on empty lines where I only need to typeC-k which is quite inconvenient as I have to use different commands for the same task: killing a line.

o / O - creates a new empty line below / above cursor and moves cursor to the new line, indented correctly

Well, C-a C-o is nearly like O, just the idention is missing. C-e C-o creates an empty line below the current but does not move the cursor.

Are there any better solutions to my problems or do I have to learn Lisp and define new commands to fulfill my needs?

These original posts are great
stackoverflow
tuxicity

multi line string in bash

2011-01-13T14:04:00.000-05:00

Multiline strings can be assigned in bash using one of these two examples.

$ String='foo1
foo2
foobar2'

STRING=$( cat <<EOF
foo1
foo2
foobar2
EOF
)

How to change your password in oracle

2011-01-06T17:54:00.001-05:00

once you are logged in to sql developer as your userid, just say "alter user {username} identified by {newpassword}"

pinboard.in with tag javascript for iPad browser Safari

2010-12-30T01:48:00.000-05:00

Here is the javascript to add pinboard.in to safari in the iPad

javascript:q=location.href;if(document.getSelection){d=document.getSelection();}else{d='';};p=document.title;void(open('http://pinboard.in/add?showtags=yes&url='+encodeURIComponent(q)+'&description='+encodeURIComponent(d)+'&title='+encodeURIComponent(p),'Pinboard',%20'toolbar=no,width=700,height=600'));

emacs goto line

2010-12-22T14:20:00.002-05:00

Just type 'M-g-g' aka ESC+g g

Textmate Bundle Command - Convert Backslash to Comma in Document / Selection

2010-12-04T02:29:00.002-05:00

Textmate Bundle Command - Convert Backslash to Comma in Document / Selection

perl -pe 's/\\/,/g'

#Set Save "Nothing"

#Set Input "Selected Text" or "Document"

# and

#Set Output "Replace Selected Text"

Textmate Bundle Command - Convert Comma to Backslash in Document / Selection

2010-12-04T02:28:00.000-05:00

Textmate Bundle Command - Convert Comma to Backslash in Document / Selection

perl -pe 's/[,]/\\/g'

#Set Save "Nothing"

#Set Input "Selected Text" or "Document"

# and

#Set Output "Replace Selected Text"

Textmate Bundle Command - Transpose Comma Seperated Lines to Tab Separated

2010-12-04T01:34:00.003-05:00

Textmate Bundle Command - Transpose Comma Seperated Lines to Tab Separated

#!/usr/bin/env ruby -wKU
aa = Array.new
STDIN.readlines.each {|e| aa.push(e.split(","))}
aa = aa.transpose
aa.each { |e| ; e.collect!{|f| f.strip } ; puts e.join("\t") }

#Input Selected Text
#Output Replace Selected Text
#Key Equivalent

Textmate Bundle Command - Remove Tabs

2010-12-04T00:33:00.000-05:00

Textmate Bundle Command - Remove Tabs
perl -pe 's/[\t]/ /g'

#Set Save "Nothing"
#Set Input "Selected Text" or "Document"
# and
#Set Output "Replace Selected Text"

Display hidden and control character in Vi / Vim

2010-11-17T02:37:00.001-05:00

Turn on using
:set list

Turn off using
:set nolist

Oct Dec Hex Control Character Values

2010-11-17T02:36:00.000-05:00

Oct Dec Hex Control Character Values
Oct Dec Hex Name
000 0 0x00 NUL
001 1 0x01 SOH, Control-A
002 2 0x02 STX, Control-B
003 3 0x03 ETX, Control-C
004 4 0x04 EOT, Control-D
005 5 0x05 ENQ, Control-E
006 6 0x06 ACK, Control-F
007 7 0x07 BEL, Control-G
010 8 0x08 BS, backspace, Control-H
011 9 0x09 HT, tab, Control-I
012 10 0x0a LF, line feed, newline, Control-J
013 11 0x0b VT, Control-K
014 12 0x0c FF, form feed, NP, Control-L
015 13 0x0d CR, carriage return, Control-M
016 14 0x0e SO, Control-N
017 15 0x0f SI, Control-O
020 16 0x10 DLE, Control-P
021 17 0x11 DC1, XON, Control-Q
022 18 0x12 DC2, Control-R
023 19 0x13 DC3, XOFF, Control-S
024 20 0x14 DC4, Control-T
025 21 0x15 NAK, Control-U
026 22 0x16 SYN, Control-V
027 23 0x17 ETB, Control-W
030 24 0x18 CAN, Control-X
031 25 0x19 EM, Control-Y
032 26 0x1a SUB, Control-Z

http://www.asciitable.com

How to edit hex values in Vi

2010-11-17T02:33:00.002-05:00

Editing binary files Edit

Use the -b option to set binary mode before editing a binary file, for example:

vim -b myfile.bin

If wanted, you can display nonprintable characters in hex, and you can wrap lines:

:setlocal display=uhex
:setlocal wrap

In normal mode, type g then Ctrl-G to display the byte number at the cursor, or type a byte number then go to jump to that byte (for example, 123go will jump to byte number 123). The first byte in the file has byte number 1.

The following command replaces the buffer with a hex dump:

:%!xxd

You can edit the hex bytes, then convert the file back to binary with the command:

:%!xxd -r

The above command reverses the hex dump by converting the hex bytes to binary (the printable text in the right column is ignored).

http://vim.wikia.com/wiki/Hex_dump

How to enter in any character in Vi / Vim

2010-11-17T02:31:00.002-05:00

By character value Edit

It is also possible to enter any character (which can be displayed in your current 'encoding'), even a character for which no digraph is defined, if you know the character value, as follows (where ^V means "hit Ctrl-V, except if you use Ctrl-V to paste, in which case you should hit Ctrl-Q instead):

By decimal value: ^Vnnn (with 000 <= nnn <= 255)
By octal value: ^VOnnn or ^Vonnn (with 000 <= nnn <= 377)
By hex value: ^VXnn or ^Vxnn (with 00 <= nn <= FF)
By hex value for BMP Unicode codepoints: ^Vunnnn (with 0000 <= nnnn <= FFFF)
By hex value for any Unicode codepoint: ^VUnnnnnnnn (with 00000000 <= nnnnnnnn <= 7FFFFFFF)

http://vim.wikia.com/wiki/Entering_special_characters

Vi search and pattern reference

2010-11-17T02:29:00.002-05:00

A guide to searching for anything in Vi / Vim, super complete and concise
http://vimdoc.sourceforge.net/htmldoc/pattern.html

The complete vi quick reference

2010-11-17T02:28:00.001-05:00

This doc literally has every vi command!

http://vimdoc.sourceforge.net/htmldoc/quickref.html