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Top Forums Shell Programming and Scripting Preserving Empty Lines while Replacing Numbers Post 302425420 by bonesy on Friday 28th of May 2010 12:00:20 AM
Old 05-28-2010
Preserving Empty Lines while Replacing Numbers

Greetings,

I am using tcsh to write a script that will replace the numbers in a file with a single number, the caveat is that this file has blank lines which are necessary for another step down the line so I need to preserve the blank lines. I have tried sed and awk but both will collapse the blank lines or write the replacing number over blank lines. Here is an example:

File1.............File2................Finish Product
1..................(blank).............1
(blank)...........2....................0
3..................(blank).............1
(blank)...........4....................0
etc.................etc.................etc.

The finish product is what I would like to have, but I don't need to get to that point right away, unless you can help provide an easy method. All I need it for the numbers in File1 to be replace by 1's and preserve line order and the same for file 2, but replaced by 0's.

Thanks for any help or guidance you could provide.
 

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shells(4)							   File Formats 							 shells(4)

NAME
shells - shell database SYNOPSIS
/etc/shells DESCRIPTION
The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser- shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root. A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by the routines which search the file. Blank lines are also ignored. The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/pfcsh, /bin/pfksh, /bin/pfsh, /bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/pfcsh, /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh. Note that /etc/shells overrides the default list. Invalid shells in /etc/shells may cause unexpected behavior (such as being unable to log in by way of ftp(1)). FILES
/etc/shells lists shells on system SEE ALSO
vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4) SunOS 5.10 4 Jun 2001 shells(4)
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