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Operating Systems AIX Pattern to replace ^M and ^Y in a 4.2 AIX text file Post 302318533 by bakunin on Thursday 21st of May 2009 08:31:54 PM
Old 05-21-2009
Quote:
Originally Posted by Browser_ice
What if the number of lines of the original file is unknown ?

In my example I gave 3 lines but it can be anything between 1 and 20 lines.
In this case you will have to have some indication for a "record" being complete. Maybe you will need some record starting criteria too, for which one could match. Provide some data and i will provide some solution.

Quote:
Originally Posted by Browser_ice
I tried the combinations below which do not change anything or are not recognized
This is just a way to enter non-printing (control-) characters into vi: enter input mode, press "CTRL-V", then press CTRL-M (for example for "^M"). You should be still in input mode and see "^M" under the cursor.

Quote:
sed 's/.$//' does remove the ^M at the end of each line but then it is still a multi-line format.
It removes the last character in a line, regardless which character this is - this is the problem. You have to specifically match "^M" (CTRL-M) and throw that out. You can throw out linefeeds by searching for "\n". Try the following with some test file:

Code:
sed 'N;s/\n/@/' /some/file

to see the effect: two lines combined to one and the linefeed is replaced by an at.

[quote]Is there a way to find out in VI what is the ascii value of the character under the cursor ?[/qoute]

No, but you can use "od -ax <file> | more".

I hope this helps.

bakunin
 

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