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Top Forums UNIX for Dummies Questions & Answers Redirection related clarifications required... Post 302227435 by marconi on Thursday 21st of August 2008 08:15:08 AM
Old 08-21-2008
Redirection related clarifications required...

There are two files named goody and good. Please look at their single line contents:-
$ cat goody
hi m goody
$ cat good
hi m good

1)
$ cat goody < good
hi m goody

When we give cat, a file to read from, standard input is ignored.
As such, the above operation will just display contents of goody.


2)
$ cat > goody < good
$ cat goody
hi m good
$ cat good
hi m good

What will be the output of the above command ? I think the command takes input from file good and then overwrites in goody and prints on terminal screen.

3) Whats the difference between a) cat goody >>= good and b) cat goody >> good

4) Whats the difference between a) cat goody >= good and b) cat goody > good

5) Whats the difference between cat < good and cat << good


Thanks a lot in advance.

Best Regards,
Marconi.
 

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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)
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