08-13-2006
Unix Shell Novice - File Manipulation
Hi,
I am brand new to unix and am hoping someone can start me in the right direction.
I want to be able to put the results of a file command such as wc -l filename into a variable which I can then use to test against another variable...i.e. I need to show the nth line of a file, but need to determine if the file contains at least n lines. currently the output from wc -l filename gives me a return of n filename - all I want is n as a numerical value.
Secondly, is there a way to retrieve the nth line of a file using a single command (similar to head or tail, but actually giving the line number?)
If anyone can help it would be appreciated.
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LEARN ABOUT FREEBSD
brand.4th
BRAND.4TH(8) BSD System Manager's Manual BRAND.4TH(8)
NAME
brand.4th -- FreeBSD ASCII art boot module
DESCRIPTION
The file that goes by the name of brand.4th is a set of commands designed to draw the ASCII art BSD brand above the boot loader menu. The
commands of brand.4th by themselves are not enough for most uses. Please refer to the examples below for the most common situations, and to
loader(8) for additional commands.
Before using any of the commands provided in brand.4th, it must be included through the command:
include brand.4th
This line is present in the default /boot/menu.rc file, so it is not needed (and should not be re-issued) in a normal setup.
The commands provided by it are:
draw-brand Draws the BSD brand.
The brand that is drawn is configured by setting the loader_brand variable in loader.conf(5) to one of ``fbsd''
(the default) or ``none''.
The position of the logo can be configured by setting the loader_brand_x and loader_brand_y variables in
loader.conf(5). The default values are 2 (x) and 1 (y).
The environment variables that effect its behavior are:
loader_brand
Selects the desired brand in the beastie boot menu. Possible values are: ``fbsd'' (default) or ``none''.
loader_brand_x
Sets the desired column position of the brand. Default is 2.
loader_brand_y
Sets the desired row position of the brand. Default is 1.
FILES
/boot/loader The loader(8).
/boot/brand.4th brand.4th itself.
/boot/loader.rc loader(8) bootstrapping script.
EXAMPLES
Set FreeBSD brand in loader.conf(5):
loader_brand="fbsd"
SEE ALSO
loader.conf(5), loader(8)
HISTORY
The brand.4th set of commands first appeared in FreeBSD 9.0.
AUTHORS
The brand.4th set of commands was written by Devin Teske <dteske@FreeBSD.org>.
BSD
May 18, 2011 BSD