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--- shell [2010/06/04 12:57] – admin
+++ shell [2010/06/11 12:17] (current) – removed 172.26.14.218
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-====== Shell tips ======
-====== Environment Modules ======
-The [[http://modules.sourceforge.org|environment modules]] package can be used to dynamically configure your shell environment for different software packages.  If you have two versions of the [[r|R statistics]] package you could easily switch between the two using the ''module'' command:
-<code>$ type -a R
-R is /usr/bin/R
-$ module load R/2.11.0
-$ type -a R
-R is /paracel/paracel/biosoft/R/2.11.0/bin/R
-R is /usr/bin/R</code>
-===== Searching for a string in multiple files =====
-Ever need to search through all your files for a certain word or phrase? You probably know about the grep command, but did you know it's recursive?
-Here's an example. In this case we're searching for the word "modules":
-<code>grep -r "modules" .</code>
-By using the "-r" switch, we're telling grep to scan files in the current directory and all sub-directories. It will return a list of files the string was found in, and a copy of the line it was found on.
-If you'd rather just get the file names and skip the rest of the output, use the "-l" switch, like so:
-<code>grep -lr "modules" .</code>
-Here's another tip: grep also supports regular expressions, so matching against a wildcard pattern is easy:
-<code>grep -lr "mod.*" .</code>
-That command will print a list of files containing any word starting with "mod".
-You can also use grep to search for multiple words:
-<code>grep -r "drupal\|joomla\|wordpress" .</code>
-And, of course, grep supports file name wildcards in the standard unix fashion. In this example, grep will search only file names starting with "log":
-<code>grep -lr "mod.*" ./log*</code>
-====== GNU screen tips ======
-GNU screen is a terminal multiplexer. That means you can run multiple terminals inside one terminal.  It has other advanced features like detaching/reattaching, which comes in handy when you use a poor network link and you have important jobs running on the remote end.
-{{:screen.png|}}
-===== Basic usage =====
-  * Start screen by typing ''screen'' in a new shell window.
-  * To get help, just use “Ctrl-A” then “?”.
-  * Create a new window: ''C-a c''  (Control-a c)
-  * Switch to the previous window: ''C-a p''
-  * Switch to the next window: ''C-a n''
-  * Alternate between two windows: ''C-a a''
-  * Switch to a window by number: ''C-a 1'' or ''C-a 2'', etc.
-  * List active screen's: ''screen -ls''
-  * Re-attach to screen: ''screen -x'' or ''screen -r'' session_name
-  * Detach from the window using ''Ctrl-A d''. This will drop you into your shell. All screen windows are still there and you can re-attach to them later.
-  * To scroll window, press ''Ctrl + a + ['' or ''Ctrl + a + esc ''to enter Copy Mode, then scroll up/down using keys ''j'' or ''k'' or:
-     C-u -  Scrolls a half page up
-     C-b -  Scrolls a full page up
-     C-d -  Scrolls a half page down
-     C-f -  Scrolls the full page down
-===== Tweaks =====
-To make your screen a little easier to use, add these lines to the appropriate files and your screen will show a status bar at the bottom with a list of programs running, time, date, etc.
-==== ~/.screenrc ====
-<code># this is the command used to start a new shell.  The "-" in front means
-# it will be a login shell (and will process normal bash startup files).
-shell -/bin/bash
-defscrollback 2048
-vbell off
-msgwait 1
-msgminwait 1
-#dynamic titles
-shelltitle '$ | bash'
-#Display date and other information in colorred window
-hardstatus on
-hardstatus alwayslastline
-hardstatus string "%{.bW}%-w%{.rW}%n %t%{-}%+w %=%{..G} %{..Y} %Y/%m/%d %0c:%s%A "</code>
-==== ~/.bashrc ====
-<code># PS1 with the escape sequence for dynamic titles in screen
-export PS1='\[\033k\033\\\][\u@\h: \w]\$ '</code>
-===Bluetooth===
-sudo apt-get install obextool gnome-vfs-obexftp blueman
-=== Statically linking executable ===
-<code> ./configure LDFLAGS=-static </code>
-<code> make LDFLAGS=-all-static </code>