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Full Discussion: [Solved] Help with using tr - Removing white spaces
Top Forums UNIX for Dummies Questions & Answers [Solved] Help with using tr - Removing white spaces Post 302560787 by newbie_01 on Saturday 1st of October 2011 07:55:04 AM
Old 10-01-2011
[Solved] Help with using tr - Removing white spaces
Hi,

I have a file that contains whitespaces with spaces and spaces and tabs on each line and am wanting to remove the whitespaces. My version of sed is one that does not recognize \t etc.

The sed and awk one-liners below that I found via Google both does not work.
Quote:
sed:
sed 's/^[ \t]*//;s/[ \t]*$//'

awk:
awk '{gsub(/^[ \t]+|[ \t]+$/,"");print}'

So my next best option is to use tr, am using tr -d '[:space:]' < in > out and while that one works, I am unfortunately losing the line endings.

When I run the tr command

The input below:

Code:
 
server01  :/mnt/arch  :20  :15 :40 :85 :N :
server02  :/mnt/arch2 :32  :15 :40 :85 :N :

Becomes:

Code:
server01:/mnt/volarch:20:15:40:85:N:server02:/mnt/arch2:32:15:40:85:N:

Preferably, I want it to be as below:

Code:
 
server01:/mnt/volarch:20:15:40:85:N:
server02:/mnt/arch2:32:15:40:85:N:

At the moment since I don't know how to get around this, am using a while read loop that reads each line and running tr -d '[:space:]' on each line. I believe this is a bit of an overkill.

Can anyone advise whether I should be able to get the desired result using tr instead of the while loop?

Thanks in advance.
Last edited by vbe; 10-28-2011 at 05:18 AM..
 

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LEARN ABOUT REDHAT

auto.master

AUTO.MASTER(5)							File Formats Manual						    AUTO.MASTER(5)

NAME

       /etc/auto.master - Master Map for automounter

DESCRIPTION

       The  auto.master map is consulted when the autofs(8) script is invoked to set up the necessary mount points for the automounter.  Each line
       in this file describes a mount point and points to another file describing the file systems to be mounted under this mountpoint. The access
       to those maps is governed by a key.

       Access to an automounted file system is customarily done using the path scheme:

       /mountpoint/key/path/file,

       where  the mountpoint will be listed in the auto.master configuration file. The key is matched in the map file pointed to by the master map
       (See autofs(5)).  The path and the file are referring to the file on the file system mounted.

FORMAT

       The file has three fields separated by an arbitrary number of blanks or tabs. Lines beginning with # are comments. The first field  is  the
       mount  point.  Second field is the map file to be consulted for this mount-point.  This field is of the form maptype:mapname, where maptype
       is one of the supported map types (file, program, yp, nisplus, hesiod, userdir, ldap), and mapname is the name of the map. The third  field
       is optional and can contain options to+ be applied to all entries in the map. Options are cumulative, which is a difference from the behav-
       ior of the SunOS automounter.

       The format of the map file and the options are described in autofs(5).

EXAMPLE

	 /home	   /etc/auto.home
	 /misc	   /etc/auto.misc
	 /mnt	   yp:mnt.map

       This will generate three mountpoints /home, /misc, and /mnt.  All  accesses  to	/home  will  lead  to  the  consultation  of  the  map	in
       /etc/auto.home, all accesses to /misc will consult the map in /etc/auto.misc, and all accesses to /mnt will consult the NIS map mnt.map.

SEE ALSO

       automount(8), autofs(5), autofs(8).

AUTHOR

       This manual page was written by Christoph Lameter <chris@waterf.org>, for the Debian GNU/Linux system.  Edited by <hpa@transmeta.com>.

								    19 Jun 2000 						    AUTO.MASTER(5)
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