06-28-2007
another perl question
I copy and paste from the book but this thing is not working.
I cannot figure out what is wrong with myline 9.. can someone please tell me
[root@localhost perl]# cat ./sort4.pl
#!/usr/bin/perl -w
use strict;
use warnings;
my $input = shift;
my $output = shift;
open(IN, '<', $input) or die "Can't read source file $input: $!\n";
open(OUT, '>', $output) or die "CAn't write to file $output: $!\n";
my @file = <IN>;
@file = sort @file;
print OUT @file;
close IN;
close OUT;
[root@localhost perl]# perl -c sort4.pl
sort4.pl syntax OK
[root@localhost perl]# perl sort4.pl
Use of uninitialized value in open at sort4.pl line 9.
Use of uninitialized value in concatenation (.) or string at sort4.pl line 9.
Can't read source file : No such file or directory
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BZEXE(1) General Commands Manual BZEXE(1)
NAME
bzexe - compress executable files in place
SYNOPSIS
bzexe [ name ... ]
DESCRIPTION
The bzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a
penalty in performance). For example if you execute ``bzexe /bin/cat'' it will create the following two files:
-r-xr-xr-x 1 root bin 9644 Feb 11 11:16 /bin/cat
-r-xr-xr-x 1 bin bin 24576 Nov 23 13:21 /bin/cat~
/bin/cat~ is the original file and /bin/cat is the self-uncompressing executable file. You can remove /bin/cat~ once you are sure that
/bin/cat works properly.
This utility is most useful on systems with very small disks.
OPTIONS
-d Decompress the given executables instead of compressing them.
SEE ALSO
bzip2(1), znew(1), zmore(1), zcmp(1), zforce(1)
CAVEATS
The compressed executable is a shell script. This may create some security holes. In particular, the compressed executable relies on the
PATH environment variable to find gzip and some other utilities (tail, chmod, ln, sleep).
BUGS
bzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually in some cases,
using chmod or chown.
BZEXE(1)