whittling down a file. Post: 302166706

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Top Forums UNIX for Dummies Questions & Answers whittling down a file. Post 302166706 by MaestroRage on Tuesday 12th of February 2008 02:50:08 PM

02-12-2008

Registered User

whittling down a file.

I want to write a simple script which will have a list of numbers. And I want to take the first number on the list, put it into a variable, use this variable to use sed to print out a line in another document. Allow me to show you an example.

File1
5
4
3
2
1

File2
This is line 1
This is line 2
This is line 3
This is line 4
This is line 5

Script
#!/bin/sh
variable= head -1 File1
sed -n '$variable p'

(How to remove the first line from File1, and redirect the output into the same file, overwriting it. Repeat process until the file has pointed to each line on the document.

Is this... not as simple as i'm thinking? Missing out some important concepts I should be learning?

Any help is greatly appreciated.

Last edited by MaestroRage; 02-12-2008 at 04:17 PM..

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LEARN ABOUT DEBIAN

config_list

CONFIG_LIST(8)						      System Manager's Manual						    CONFIG_LIST(8)

NAME

       config_list - Configure a Mailman mailing list from a text file description

SYNOPSIS

       config_list [options] listname

DESCRIPTION

       This  is  a very powerful script which lets you view and modify a list's configuration variables from the command line.	E.g.  you can dump
       out all the list options into a plain text file (actually a valid Python file!), complete with comments explaining each variable.   Or  you
       can apply the configuration from such a file to a particular list.

OPTIONS

       -i filename, --inputfile=filename
	      Configure  the  list  by assigning each module-global variable in the file to an attribute on the list object, then saving the list.
	      The named file is loaded with execfile() and must be legal Python code.  Any variable that isn't already an attribute  of  the  list
	      object is ignored (a warning message is printed).  See also the -c option.

	      A  special  variable  named `mlist' is put into the globals during the execfile, which is bound to the actual MailList object.  This
	      lets you do all manner of bizarre thing to the list object, but BEWARE!  Using this can severely (and possibly  irreparably)  damage
	      your mailing list!

       -o filename, --outputfile=filename
	      Instead  of  configuring	the list, print out a list's configuration variables in a format suitable for input using this script.	In
	      this way, you can easily capture the configuration settings for a particular list and imprint those settings on another list.  file-
	      name is the file to output the settings to.  If filename is `-', standard out is used.

       -c, --checkonly
	      The modified list is not actually changed.  Only useful with -i.

       -v, --verbose
	      Print the name of each attribute as it is being changed.	Only useful with -i.

       -h, --help
	      Print a small help text and exit

NOTES

       The options -o and -i are mutually exclusive.

AUTHOR

       Author  of  Mailman  is	the  Mailman  Cabal,  see  http://www.list.org/  for  information.  This  manpage  is  written	by Tollef Fog Heen
       <tfheen@debian.org> for Debian, but may be used by others.

SEE ALSO

       Mailman documentation on http://www.list.org/ and in /usr/share/doc/mailman.

								    2001-03-10							    CONFIG_LIST(8)