Problem wth spec chars in script Post: 303006271

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Top Forums Shell Programming and Scripting Problem wth spec chars in script Post 303006271 by elxa1 on Monday 30th of October 2017 03:40:28 PM

10-30-2017

Registered User

Quote:

Originally Posted by jim mcnamara

Your answer is somewhat evasive.

Two ways:
1. use the printf method to embed punctuation and other odd characters. Unless you are using windows do not put \r in anything. expect gets a return from bash reading the script -- and it is a newline, \n

2. you can escape characters ( \ escape in front of each character, so \\ is read by the shell as a backslash, not escape). The shell takes them as literal characters, not some shell command -- example \*\# is an asterisk and an octothorpe (pound sign). Not a wild card and not a start of a comment.

Thank You Jim for your help - and sorry for my late reply. The problem is still actual for me.

So, I suppose, that only proper way for me will be the 1st method. Due to diversity of the passkeys it would be easier than putting backslashes in 2000-marks passkey's for example. The lenght of the keys can differ, and the special chars qty is also random.

About the method you mentioned:

1. I would like to use only in linux, and on linux I also can prepare passlist (unix-type line endings and non viible characters on passlist).

2. If that method (printf) could help - maybe 'expect' will not be essential?

I have tried using expect due to problems with using 7z x -p$klucz (or $passkey) archive.7z
The $ mark is only for calling a variable. That is possible, that on the begginning will be Dollar sign - $ .

Maybe your solution would allow me to use passkeys without bash-processing it in native 7z commands? So, if I can use it as a full text in script - 7z x -p$passkeyfromprintf

Unfortunately - I am starting with bash programming - and I really do not have idea how to use your snippet. Would you like to show me any example how to start using this ?

So, if I would use it my simpler script: (could you please help me with that one?)
"7z t" - 7z TEST, which wll exit when the passkey is bad.

Code:

2var=$(printf "%s%c" "\$klucz" 13)
while read $klucz 
do  7z t -p$2var archive.7z
echo $2var
done<passkeylist.txt

Is that should work?
regards

elxa1

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LEARN ABOUT LINUX

alien::package::rpm

Alien::Package::Rpm(3pm)				User Contributed Perl Documentation				  Alien::Package::Rpm(3pm)

NAME

       Alien::Package::Rpm - an object that represents a rpm package

DESCRIPTION

       This is an object class that represents a rpm package. It is derived from Alien::Package.

FIELDS

       prefixes
	   Relocatable rpm packages have a prefixes field.

METHODS

       checkfile
	   Detect rpm files by their extention.

       install
	   Install a rpm. If RPMINSTALLOPT is set in the environement, the options in it are passed to rpm on its command line.

       scan
	   Implement the scan method to read a rpm file.

       unpack
	   Implement the unpack method to unpack a rpm file. This is a little nasty because it has to handle relocatable rpms and has to do a bit
	   of permissions fixing as well.

       prep
	   Prepare for package building by generating the spec file.

       cleantree
	   Delete the spec file.

       build
	   Build a rpm. If RPMBUILDOPT is set in the environement, the options in it are passed to rpm on its command line.

	   An optional parameter, if passed, can be used to specify the program to use to build the rpm. It defaults to rpmbuild.

       version
	   Set/get version.

	   When retreiving the version, remove any dashes in it.

       postinst
       postrm
       preinst
       prerm
	   Set/get script fields.

	   When retrieving a value, we have to do some truely sick mangling. Since debian/slackware scripts can be anything -- perl programs or
	   binary files -- and rpm is limited to only shell scripts, we need to encode the files and add a scrap of shell script to make it
	   unextract and run on the fly.

	   When setting a value, we do some mangling too. Rpm maintainer scripts are typically shell scripts, but often lack the leading shebang
	   line.  This can confuse dpkg, so add the shebang if it looks like there is no shebang magic already in place.

	   Additionally, it's not uncommon for rpm maintainer scripts to contain bashisms, which can be triggered when they are ran on systems
	   where /bin/sh is not bash. To work around this, the shebang line of the scripts is changed to use bash.

	   Also, if the rpm is relocatable, the script could refer to RPM_INSTALL_PREFIX, which is set by rpm at run time. Deal with this by
	   adding code to the script to set RPM_INSTALL_PREFIX.

       arch
	   Set/get arch field. When the arch field is set, some sanitizing is done first to convert it to the debian format used internally. When
	   it's retreived it's converted back to rpm form from the internal form.

AUTHOR

       Joey Hess <joey@kitenet.net>

perl v5.12.3							    2011-06-11						  Alien::Package::Rpm(3pm)