Need to find out what's going on in the last line

November 30, 2012 at 16:43:50
Specs: Windows 7

script called middle. Usage

is given within the script itself. Show a few sample runs, and also explain

what is going on in the last line.

#! /bin/bash

# check # of command line arguments

if [ $# -lt 3 ]
then
echo "Usage: middle <start line number> <end line number> <filename>"
exit
fi

# note that $1 is the first command line argument,
# $2 is the second argument, so on...

head -$2 $3 | tail -`expr $2 - $1 + 1`


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#1
November 30, 2012 at 21:03:08

Wow! you won't find home work much easier than this! The instructor gives you the script and you're too lazy to run the script yourself??

man head
man tail
man expr


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#2
December 1, 2012 at 13:11:51

I missed a few weeks of class due to illness just trying to catch up! Missed a lot of information then too!

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