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Full Discussion: How to delete all lines with less then 32 characters from a textfile?
Top Forums Shell Programming and Scripting How to delete all lines with less then 32 characters from a textfile? Post 302399138 by Ultrix on Friday 26th of February 2010 11:45:22 AM
Old 02-26-2010
Quote:
Originally Posted by alister
Did you test it with filenames containing IFS characters? Assuming a default IFS value, your option handling, sed invocations, and cat statement will all barf if a filename contains whitespace.

Code:
for opt in $*

should be
Code:
for opt in "$@"

All instances of $3 need to be double-quoted.

Alister
Okay, I'll change that then.

EDIT: I fixed the script. It now looks like this:
Code:
#!/bin/bash
# deletes lines of a certain range length from a file
# Writing the result to the file is optional.

write="no";
for opt in "$@"
do
	case "$opt" in
		-w ) write="yes";
		     shift;;
		-* ) shift;;
		*  );;
	esac
done
least=$1;
great=$2;
shift;
shift;
filname="$*";
if [ $write == "yes" ]
then
	sed -e "/^.\{$least,$great\}$/d" "$filname" > tempfile.txt;
	cat tempfile.txt > "$filname";
	rm tempfile.txt;
else
	sed -e "/^.\{$least,$great\}$/d" "$filname";
fi
unset write

All I did was put quotation marks around the filename. I was also able to fix another script that I wrote a while back which was having the same problem.

Actually I've found I don't have to use "$@". It works whether I use that or $*. The quotation marks were the only problem.
Last edited by Ultrix; 02-26-2010 at 01:10 PM..
 

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LEARN ABOUT DEBIAN

bfbtester

BFBTESTER(1)						      General Commands Manual						      BFBTESTER(1)

NAME

       bfbtester - Brute Force Binary Tester

SYNOPSIS

       bfbtester [-htv] [-d level] [-r rejects] [-o out-file] [-x max-execs] -a|[-sme] files ...

DESCRIPTION

       BFBTester  is  great  for  doing quick, proactive, security checks of binary programs. BFBTester will perform checks of single and multiple
       argument command line overflows as well as environment variable overflows. BFBTester can also watch for tempfile creation activity to alert
       the  user  of  any programs using unsafe tempfile names. While BFBTester can not test all overflows in software, it is useful for detecting
       initial mistakes that can red flag dangerous software.

OPTIONS

       You must specify one or more of the following tests:

       -s     Single Argument Test.

       -m     Multiple Argument Test.

       -e     Environment Variable Test.

       -a     Selects all tests
	      Other options:

       -h     Print help.

       -t     Enable tempfile monitoring.

       -v     Print version string.

       -d level
	      Set debug level (default = 0, max = 2).

       -r rejects
	      Comma separated list of binaries to skip.

       -o out-file
	      Output to out-file rather than stdout.

       -x max-execs
	      Set maximum executables to run in parallel (default = 250).

       file   Specific binary or a directory of binaries to test.

OVERVIEW

       You must specify at least one test to run and you must specify either a binary or a directory.

       Executable selection is now done in one of several ways:

       If the executable filename is specified with a leading slash (an absolute path), no selection is used and the supplied absolute filename is
       used.

       If there is no leading slash in the filename the selection is made in one of two ways (in this order):
	 1) Prepend file name with $PWD and test accesiblity
	 2) Search through $PATH and find first accessible executable The first one to succeed is the executable choosen.

       If the filename found is a directory, we walk the directory (one level deep) looking for executable binaries.

       Symbolic links are followed.

       You can specify binaries to skip (useful when loading a whole directory) by using the -r option.

       The following is a crash report:

       *** Crash </usr/bin/patch> ***
	args:		-D [05120]
	envs:		(null)
	Signal: 	11 ( Segmentation fault )
	Core?		Yes

       This means "/usr/bin/patch" crashed when fed with an "-D" and a word 5,120 characters long:

       $ /usr/bin/patch -D AAA...5,120 characters...AAA

       (Numbers in brackets mean replace with a word that many characters long)

       BFBTester is very CPU intensive, and will open many files, so you probably don't want to run it on a production machine during it's busiest
       period. Just a warning...

EXAMPLES

       bfbtester -s /usr/bin
	      Run the single argument test on all binaries in folder /usr/bin.

       bfbtester -ta patch traceroute
	      Run all tests against patch and traceroute and run the tempfile monitor.

       bfbtester -a ./bfbtester
	      Tests bfbtester (provided it's in the same directory).

       bfbtester -r kill /usr/bin/kill
	      Does nothing.

AUTHOR

       This manual page was written by Karl Soderstrom <ks@debian.org>, for the Debian GNU/Linux system (but may be used by others).

								 januari 23, 2001						      BFBTESTER(1)
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