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Full Discussion: Removing \r and \n during reading file through while loop
Top Forums Shell Programming and Scripting Removing \r and \n during reading file through while loop Post 302914920 by bakunin on Friday 29th of August 2014 03:34:31 AM
Old 08-29-2014
Quote:
Originally Posted by Pulkit Lall
I also tried using IFS='\r\n'
You were on the right track, but the shell doesn't work like printf. "\r" is just an escaped "r" (an "r" made sure to be literally meant) and this is why it split at the letter "r".

To use control codes you need to enter them as they are, (single-) quoted like you did, but otherwise "uncooked". Depending on the editor you use there are different ways to accomplish this, here is how it is done in vi:

Enter a CTRL-V in input mode. The next character you enter is interpreted as literal, then.

Press "<ENTER>", for instance, and a "^M" will appear. Notice that this is one character, not two! You see that when you switch back to command mode and go over the character with the cursor. Pressing "<TAB>" instead will give you a "^I", which is the display equivalent of the TAB-character (you will see these control characters also when you set your vi to ":set line". Switch back to normal via ":set nolines".

I hope this helps.

bakunin

/PS: this works on the command line too if you use Korn shell and switch to vi-mode ("set -o vi").

EDIT: you posted while i was writing my answer. Probably there is a way easier solution for your problem: you got your file perhaps transferred from some DOS/Windows system and this is what causes your problem.

Either: ftp your file with the "ASCII"-mode set instead of the default binary next time;
or: change the file by running it through one of these "dos2unix"-commands or something similar;
or: do that yourself with a small sed-script. Notice, you will need the above-mentioned method for this, the "^M" is a literally entered "<ENTER>".

Code:
sed 's/^M$//' /your/input/file > /some/output/file

Last edited by bakunin; 08-29-2014 at 04:41 AM..
 

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LEARN ABOUT DEBIAN

pconsole

PCONSOLE(1)						      General Commands Manual						       PCONSOLE(1)

NAME

       pconsole - parallel console shell for administering clusters.

SYNOPSIS

       pconsole

DESCRIPTION

       pconsole  allows you to connect to each node of your cluster simultaneously, and you can type your administrative commands in a specialized
       window that 'multiplies' the input to each of the connections you have opened.  pconsole is best run from within X Windows, although it	is
       possible to employ it without X (in console mode) as well.

       You need to install pconsole on only 1 machine in the cluster, this would usually be your central administrative node.

OPTIONS

       pconsole  need  to be executed with superuser permissions, and enters in interactive mode let you attach other devices so that all the com-
       mands sent to the console mode of pconsole are sent to the devices. This allows you to parallelize the execution of  the  same  command	in
       various machines at a time.

       pconsole has two working modes:

       command mode
	      From  this  mode pconsole can attach and dettach devices, list the attached devices at a time, connect to sending mode where you can
	      send commands to the attached devices, and quit.	To enter in command mode, use CTRL-A from sending mode.

       sending mode
	      The mode where the commands sent to it are sent to the devices attached.	To enter this mode use CTRL-D or use the console command.

SEE ALSO

       /usr/share/doc/pconsole/README.gz xterm(1)

AUTHOR

       This manual page was written by Jesus Climent <jesus.climent@hispalinux.es>, for the Debian GNU/Linux system (but may be used by others).

																       PCONSOLE(1)
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