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Homework and Emergencies 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
Old 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. Smilie

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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CAT(1)							      General Commands Manual							    CAT(1)

NAME
cat, read, nobs - catenate files SYNOPSIS
cat [ file ... ] read [ -m ] [ -n nline ] [ file ... ] nobs [ file ... ] DESCRIPTION
Cat reads each file in sequence and writes it on the standard output. Thus cat file prints a file and cat file1 file2 >file3 concatenates the first two files and places the result on the third. If no file is given, cat reads from the standard input. Output is buffered in blocks matching the input. Read copies to standard output exactly one line from the named file, default standard input. It is useful in interactive rc(1) scripts. The -m flag causes it to continue reading and writing multiple lines until end of file; -n causes it to read no more than nline lines. Read always executes a single write for each line of input, which can be helpful when preparing input to programs that expect line-at-a- time data. It never reads any more data from the input than it prints to the output. Nobs copies the named files to standard output except that it removes all backspace characters and the characters that precede them. It is useful to use as $PAGER with the Unix version of man(1) when run inside a win (see acme(1)) window. SOURCE
/src/cmd/cat.c /src/cmd/read.c /bin/nobs SEE ALSO
cp(1) DIAGNOSTICS
Read exits with status eof on end of file or, in the -n case, if it doesn't read nlines lines. BUGS
Beware of and which destroy input files before reading them. CAT(1)
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