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Full Discussion: Limitations of tac/cat?
Top Forums Shell Programming and Scripting Limitations of tac/cat? Post 302459553 by frans on Tuesday 5th of October 2010 02:13:26 AM
Old 10-05-2010
Quote:
Originally Posted by 127.0.0.1
As part of a quiz assigned during my unix class I was asked to write a program to ask for a file name, print read errors, and "reverse elements in a list."

I used the 'tac' command in my solution, however, I was then lectured for 5 min about the "limitations" of the 'tac' command and how a 'for' loop would have been more robust.
I think it's not an issue question but that you were asked to write a program and show what logic you would involve (in state of using the "out of the box" tac).
Don't you think so ?
 

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LEARN ABOUT SUSE

tac

TAC(1)								   User Commands							    TAC(1)

NAME

       tac - concatenate and print files in reverse

SYNOPSIS

       tac [OPTION]... [FILE]...

DESCRIPTION

       Write each FILE to standard output, last line first.  With no FILE, or when FILE is -, read standard input.

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

       -b, --before
	      attach the separator before instead of after

       -r, --regex
	      interpret the separator as a regular expression

       -s, --separator=STRING
	      use STRING as the separator instead of newline

       --help display this help and exit

       --version
	      output version information and exit

AUTHOR

       Written by Jay Lepreau and David MacKenzie.

REPORTING BUGS

       Report tac bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>

COPYRIGHT

       Copyright (C) 2009 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

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

	      info coreutils 'tac invocation'

       should give you access to the complete manual.

GNU coreutils 7.1						     July 2010								    TAC(1)
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