====== Useful linux command ======

===== lib search path  =====
    export LD_LIBRARY_PATH=.

===== cat file content to clipboard =====
//Source: StackOverflow//
	
You're a little ambiguous. I expect you're probably a Linux user inside X who wants to put stuff in the X PRIMARY clipboard.

It's important to understand that bash doesn't have a clipboard. There is no such thing as "the" clipboard, because bash can run on Windows, Mac OS X, lots of other OSes, inside X, outside X, ... Not to mention that X itself has three different clipboards itself. There's a wealth of clipboards you could be dealing with. Usually the clipboard you want to talk to has a utility that lets you talk to it.

In case of X, yes, there's xclip (and others).

If you're trying to talk to the Mac OS X clipboard, there's pbcopy.

If you're in Linux terminal mode (no X) then maybe you need to look into gpm.

There's also GNU screen which has a clipboard. To put stuff in there, look at the screen command "readreg".

For Windows, read /dev/clipboard (thanks glenn).

Note that xclip -selection c will send data to the clipboard that works with ^C, ^V in most applications.
    cat filename.java | xclip -selection c
    
===== find =====
  * http://www.softpanorama.org/Tools/Find/using_exec_option_and_xargs_in_find.shtml


  * find all fiel start with 'filename'
    find . -name filename\*

  * find case insensitive
    find . -iname filename\*

  * find all [F,f]ilename and exclude filename
    find . -iname filename\* -not -name filename\*

  * find supports and, or, not (-a, -o, ! escaped as \!)
    find . -iname david\ gray\*ogg -and -type f > david_gray.m3u
    find . -iname "david gray*ogg" -and -type f > david_gray.m3u

  * search subdirectory
    find . -ipath \*david\ gray\*ogg -type f > david_gray.m3u

  * 2 list
    find ~ -type f \( -name \*.php -fprint php_files , 
                    -name \*.js -fprint javascript_files \)

  * prune
    find (-path <don't want this> -o -path <don't want this#2>)
\-prune -o -path <global expression for what I do want>

  * find using file attributes
    -nouser         file is owned by someone no longer listed in /etc/passwd
    -nogroup        the group the file belongs to is no longer listed in /etc/groups
    -owner <username>       file is owned by specified user.

  * print options
    find . -name \*.ogg -printf %f\\n

    %p      filename, including name(s) of directory the file is in
    %m      permissions of file, displayed in octal.
    %f      displays the filename, no directory names are included
    %g      name of the group the file belongs to.
    %h      display name of directory file is in, filename isn't included.
    %u      username of the owner of the file

  * print findings
    find . -iname david\ gray\*ogg -type f -fprint david_gray.m3u

  * execution
    find ~/oggs/ -iname \*.mp3 | xargs rm

  * more efficient execution. ';' is escaped for bash
    find ~/oggs/ -iname \*.mp3 -exec rm {} \; (a space after {}) 

  * confirm mit -ok (same as -exec)
    find ~/oggs/ -iname \*.mp3 -ok rm {} \;

  * maxdepth
    vim -R `find . -name \*.dat -maxdepth 1`

  * regex
    /home/library/code$ find . -regex '.*/mp[0-4].*'

  * regex case insensitive
    /home/library/code$ find . -iregex '.*/mp[0-4].*'
    find . -regex './ch0[1-2]_0[1-3].*'

  * filesystem type
    find / -maxdepth 1 \( -fstype msdos \) -prune -or -print
===== - Tmux =====
  * https://tmuxcheatsheet.com/
==== - Sessions ====

tmux
tmux new
tmux new-session
new
Start a new session

tmux new -s mysession
new -s mysession
Start a new session with the name mysession

tmux kill-ses -t mysession
tmux kill-session -t mysession
kill/delete session mysession

tmux kill-session -a
kill/delete all sessions but the current

tmux kill-session -a -t mysession
kill/delete all sessions but mysession

Ctrl + b $
Rename session

Ctrl + b d
Detach from session

attach -d
Detach others on the session (Maximize window by detach other clients)

==== - Copy Mode ====

^ Command               ^ Desc                                                        ^
| setw -g mode-keys vi  | use vi keys in buffer ("Ctrl + b :" to enter command mode.  |
| Ctrl + b [            | Enter copy mode                                             |

Ctrl + b PgUp               Enter copy mode and scroll one page up

q                           Quit mode

g                           Go to top line

G                           Go to bottom line

Scroll up

Scroll down

h
Move cursor left

j
Move cursor down

k
Move cursor up

l
Move cursor right

w
Move cursor forward one word at a time

b
Move cursor backward one word at a time

/
Search forward

?
Search backward

n
Next keyword occurance

N
Previous keyword occurance

Spacebar
Start selection

Esc
Clear selection

Enter
Copy selection

Ctrl + b ]
Paste contents of buffer_0

show-buffer
display buffer_0 contents

capture-pane
copy entire visible contents of pane to a buffer

list-buffers
Show all buffers

choose-buffer
Show all buffers and paste selected

save-buffer buf.txt
Save buffer contents to buf.txt

delete-buffer -b 1
delete buffer_1
==== - Misc ====

Ctrl + b :
Enter command mode

set -g OPTION
Set OPTION for all sessions

setw -g OPTION
Set OPTION for all windows

set mouse on
Enable mouse mode