emacs - only highlight line mode for prog and text mode, disable it in

[dotfiles.git] / study-note.org

diff --git a/study-note.org b/study-note.org
index 4caf549..711cc94 100644 (file)
--- a/study-note.org
+++ b/study-note.org
@@ -4,24 +4,9 @@
 #+DATE: 2016-08-18
 
 * Programming Languages
-** gnuplog
-
-1. normal
-#+BEGIN_SRC gnuplot :exports code :file ./temp/sin.png
-  reset
-  plot sin(x)/x
-#+END_SRC
-
-#+RESULTS:
-[[file:./temp/sin.png]]
-
-2. plot with data file
-#+BEGIN_SRC 
-
-#+END_SRC
-
-
-* Perl One Line Command
+** Perl 
+*** One line command
+**** perl help
 #+BEGIN_SRC sh :exports both :results output replace
   perl --help
 #+END_SRC
@@ -63,24 +48,116 @@ Run 'perldoc perl' for more help with Perl.
 
 #+end_example
 
-1. Used as =grep=
+**** Used as =grep=
 #+BEGIN_SRC sh
   perl -ne 'print if /expression/' xxx.log;
 #+END_SRC
 
+#+BEGIN_SRC perl :results output replace
+  my $tt = "hello";
+  ($tt =~ /h(.*)o/ ) and print $1;
+#+END_SRC
+
+#+RESULTS:
+: ell
+
 Or 
 #+BEGIN_SRC sh
   perl -wnl -e '/keyword/ and print;' xxx.log
 #+END_SRC
 
-
-2. Used as =awk=
+**** Used as =awk=
 #+BEGIN_SRC sh
   perl -ne 'print "$1\n" if /aaa=(\d+)\s.*/' xxx.log;
 #+END_SRC
 
-3.
-#+BEGIN_SRC sh
-  perl -pe 'some code' < input.txt > output.txt
+#+BEGIN_SRC fundamental :tangle ./temp/aa.txt
+  aa: 1
+  bb: 2
+  cc: 3
+  dd: 4
+#+END_SRC
+
+#+BEGIN_SRC sh :results output replace
+  perl -wnl -e 'print "==$.: $_"' ./temp/aa.txt
+#+END_SRC
+
+#+RESULTS:
+: ==1: 
+: ==2: aa: 1
+: ==3: bb: 2
+: ==4: cc: 3
+: ==5: dd: 4
+
+*** Special Variable
+See special variable in perl [[http://perldoc.perl.org/perlvar.html][perlvar]], or =perldoc perlvar=
+- =$.= Current line number
+
+** gnuplog
+
+1. normal
+#+BEGIN_SRC gnuplot :exports code :file ./temp/sin.png
+  reset
+  plot sin(x)/x
+#+END_SRC
+
+#+RESULTS:
+[[file:./temp/sin.png]]
+
+2. plot with data file
+#+BEGIN_SRC fundamental :tangle ./temp/plot.dat 
+  # x y
+  1 11
+  2 12
+  3 13
+  4 14
+  5 15
+  6 16
+  7 17
+  8 18
+  9 19
 #+END_SRC
 
+#+BEGIN_SRC gnuplot :file ./temp/ll.png
+  reset
+  set xrange [0:10]
+  set yrange [0:20]
+  plot "./temp/plot.dat" using 1:2 with lines
+#+END_SRC
+
+#+RESULTS:
+[[file:./temp/ll.png]]
+
+* TCP/IP
+** netstat
+#+BEGIN_SRC sh :results output replace
+  netstat -atn    # For tcp port
+  netstat -aun    # For udp port
+  netstat -atun   # both
+#+END_SRC
+
+** nc (netcat)
+#+BEGIN_SRC sh :results output replace
+  # listening on port 1234 for a connection
+  nc -l 1234
+
+  # connect to the machine and port
+  nc 127.0.0.1 1234
+#+END_SRC
+
+* Emacs
+** =add-hook= vs =eval-after-load=
+Ref [[http://stackoverflow.com/questions/2736087/eval-after-load-vs-mode-hook][eval-after-load-vs-mode-hook]]
+#+BEGIN_QUOTE
+Code wrapped in =eval-after-load= will be executed only once, so it is typically used to perform
+one-time setup such as setting default global values and behaviour. An example might be setting
+up a default keymap for a particular mode. In =eval-after-load= code, there's no notion of the 
+"current buffer".
+
+Mode hooks exectue once for every buffer in which the mode is enabled, so they're used for per-buffer
+configuration. Mode hooks are therefore run later than =eval-after-load= code; this lets them take 
+actions baed upon such information as whether other modes are enabled in the current buffer.
+#+END_QUOTE
+
+
+