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Is your file in DOS format? Try converting it to UNIX format first:
tr -d '\r' < file > newfile

The first means:

The second is a regular variable assignment. The quotes are not necessary:

Both variables are exported.

To give an example:
$ echo "$var"

$ var=${var-foo}
$ echo "$var"...

eval is a two-stage operation, it first concatenates the arguments with spaces in between and then executes the resulting command. The backslash is there to keep the first $-sign from being evaluated...

#! /bin/bash

n=$1
x=`ls -l | wc -l`
for y in $(ls -1t | tail -$(( $x - $n ))); do rm -rf $y; done