Update README.md

 Set of programs to manipulate data in blc_channels. They do not have any lib dependency.
 Set of programs to manipulate data in blc_channels. They do not have any lib dependency.
 
 
-i_keyboard
-==========
+Acquire input values
+====================
 
 
-Change values with the keyboard arrows or specific keys. `i_keyboard`
+From keyboard
+-------------
+
+`i_keyboard` changes values with the keyboard arrows or specific keys:
 
 
     Waiting for one key in '0123456789abcdef'. Quitting with 'q'
     Waiting for one key in '0123456789abcdef'. Quitting with 'q'
     /i_keyboard31058
     /i_keyboard31058
 
 
-This means that a channel (/i_keyboard31058) of 16 ( because 16 characters in the string) 'UIN8' (default) has been created.
-Press Up and Down to increase or decrease the first value. Use Right and Left or key of the key list to select another value to change. `Esc` sets the value back to neutral values (default 50% i.e. 127)
+This means that a channel (/i_keyboard31058) of 16 ( by default there is 16 characters in the string) 'UIN8' has been created.
+Press Up and Down to increase or decrease the first value. Use Right and Left or one key of the key list to select another value to change.
+`Esc` sets the value back to neutral values (default 50% i.e. 127)
 
 
 i_keyboard has many options (use `ikeyboard h` to list them) we illustrate some:
 i_keyboard has many options (use `ikeyboard h` to list them) we illustrate some:
 
 
@@ -30,6 +34,28 @@ You can change the min and max with -m and -M. The default step of one keypresse
 
 
 Sometime you do not want intermediate values but only toggle to max and min then use -T.
 Sometime you do not want intermediate values but only toggle to max and min then use -T.
 
 
+From files
+----------
+
+    `i_fread <filename.tsv>` 
+
+Read a line of data from the file in tsv (i.e. '0.3  0.55    0.56    ' is a vector of 3 values) and creates a channel (a vector) containing these data.
+If there are many lines, it updates the data as fast as possible with each time.
+It is very fast you can be either be synchronized or using -p to requiert a minimal time between each update.
+You can also use a first column describing the time in µs to read the line.
+Finaly you can limit the number of line read by using -n.
+
+
+Generate outputs
+================
+
+to a file
+---------
+
+    `o_fread <channel> -f <filename.tsv>` 
+
+Create a tsv file with the data of the channel. The options are symetrical with i_fread.
+