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Homework & Coursework Questions
Make a file accept only two arguments from the command line
Post 302935745 by Don Cragun on Wednesday 18th of February 2015 10:55:47 PM
02-18-2015
In addition to what sea and Scrutinizer have already said, also note that there must be spaces between the arguments to the test expression command (AKA [ expression ]), including the closing ].
Also look at the man page for the cat command (man cat). You can use cat to put text into a file, but not the way you have done it. The text to go into your output file needs to be fed into cat by piping data into cat, redirecting input from a file containing the text, using a here-document, or naming the file containing your input data as a file operand. You might also consider redirecting the output from a Korn shell echo or printf built-in command to put a line of text into a file using redirection.
You have set up your script to be run by the Korn shell and checked that there are exactly two arguments given to your script. That takes care of items #1 and part of #3 in your assignment.
We can't tell what you have named your script nor whether or not you have made it executable from what you have shown us.
I don't see anything in your assignment that says that a file named message exists in your assignment directory nor that you are supposed to create a file named message1.
Also look at the man page for the cat command (man cat). You can use cat to put text into a file, but not the way you have done it. The text to go into your output file needs to be fed into cat by piping data into cat, redirecting input from a file containing the text, using a here-document, or naming the file containing your input data as a file operand. You might also consider redirecting the output from a Korn shell echo or printf built-in command to put a line of text into a file using redirection.
You have set up your script to be run by the Korn shell and checked that there are exactly two arguments given to your script. That takes care of items #1 and part of #3 in your assignment.
We can't tell what you have named your script nor whether or not you have made it executable from what you have shown us.
I don't see anything in your assignment that says that a file named message exists in your assignment directory nor that you are supposed to create a file named message1.
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LEARN ABOUT OPENSOLARIS
gzexe
GZEXE(1) General Commands Manual GZEXE(1) NAME
gzexe - compress executable files in place SYNOPSIS
gzexe [ name ... ] DESCRIPTION
The gzexe 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 ``gzexe /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
gzip(1), gznew(1), gzmore(1), gzcmp(1), gzforce(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
gzexe 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. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWgzip | +--------------------+-----------------+ |Interface Stability | Committed | +--------------------+-----------------+ NOTES
Source for gzip is available on http://opensolaris.org. GZEXE(1)