Need help with a really basic assignment, probably gonna take you 5 mins to do.but it worse 7% to me Post: 302624661

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Homework and Emergencies Homework & Coursework Questions Need help with a really basic assignment, probably gonna take you 5 mins to do.but it worse 7% to me Post 302624661 by Corona688 on Monday 16th of April 2012 01:48:24 PM

04-16-2012

Registered User

From man head:

Code:

       -n, --lines=[-]K
              print  the first K lines instead of the first 10; with the lead-
              ing `-', print all but the last K lines of each file

So -n expects the number of lines. If you're not giving it a number of lines, don't bother telling head -n.

You're improperly nesting your if's. If you want to do if/else, use elif. Or you could break it into two completely separate if-statements. And you still have the useless ;'s there.

And the 'return' still doesn't do anything like what you think it does. It doesn't jump to the top of the script. To loop, you need a loop.

Code:

if [ "$e" = 'y' ] || [ "$e" = 'Y' ]
then exit
elif [ "$e" =  'n'] || [ "$e" = 'N' ]
return
fi # only one fi

The first argument is $1. So ls -l $1. There's another argument you can give ls to reverse its order, which you can find via man ls.

You can tell how many arguments there are with the $# special variable. Something like if [ "$#" -eq 2 ] to do one thing when you have two arguments, and another when you don't.

You can redirect into a file with >. command > filename

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LEARN ABOUT REDHAT

head

HEAD(1) 								FSF								   HEAD(1)

NAME

       head - output the first part of files

SYNOPSIS

       head [OPTION]... [FILE]...

DESCRIPTION

       Print  first  10 lines of each FILE to standard output.	With more than one FILE, precede each with a header giving the file name.  With no
       FILE, or when FILE is -, read standard input.

       Mandatory arguments to long options are mandatory for short options too.

       -c, --bytes=SIZE
	      print first SIZE bytes

       -n, --lines=NUMBER
	      print first NUMBER lines instead of first 10

       -q, --quiet, --silent
	      never print headers giving file names

       -v, --verbose
	      always print headers giving file names

       --help display this help and exit

       --version
	      output version information and exit

       SIZE may have a multiplier suffix: b for 512, k for 1K, m for 1 Meg.

AUTHOR

       Written by David MacKenzie.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The  full documentation for head is maintained as a Texinfo manual.  If the info and head programs are properly installed at your site, the
       command

	      info head

       should give you access to the complete manual.

head (coreutils) 4.5.3						   February 2003							   HEAD(1)