convert a string / remove file name ending

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Re: convert a string / remove file name ending

Post#16 by port » 11 Mar 2016, 11:24

to get the version number only simply do that:

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V=${FILENAME%*.*.*}
V=${V#*[-_.]}
assuming FILENAME is a variable containing file name, this works whatever combination of ending suffix while following the pattern .a.b (i,e .tar.gz .tar.bz .x.Z ...) and a prefix separated for version number with chars - _ or . (i.e myfile.19.2.3.tar.gz afile-2.4.bar.Z thefile_1.1.1-00010.x.y )

if you want to limit suffix to just .tar.* replace first line with

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V=${FILENAME%*.tar.*}
and if you want just .tar.gz replace it with

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V=${FILENAME%*.tar.gz}
Also if you want more (or less) chars allowed to separate name prefix and version number, just include the desired chars between brackets, for example if you only want - and _ use this code:

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V=${V#*[-_]}

and if you want the chars . - _ : + use

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V=${V#*[-_:+.]}


proof of concept:

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#!/bin/bash
echo -n "filename: "; read F
V=${F%*.*.*}
V=${V#*[-_:+.]}
echo "$F -> $V"

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Rava
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Re: convert a string / remove file name ending

Post#17 by Rava » 11 Mar 2016, 14:21

Thanks for that, interesting approach...
Cheers!
Yours Rava

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brokenman
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Re: convert a string / remove file name ending

Post#18 by brokenman » 11 Mar 2016, 18:35

to get the version number only simply do that:
V=${FILENAME%*.*.*}
V=${V#*[-_.]}
Using a common slackware file as an example:

FILENAME=openldap-client-2.4.42-x86_64-1.txz
V=${FILENAME%*.*}
echo $V
openldap-client-2.4.42-x86_64-1
V=${V#*[-_.]}
echo $V
client-2.4.42-x86_64-1

Verdict: No good for getting version if your file name has a name-with-a-dash
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Re: convert a string / remove file name ending

Post#19 by port » 12 Mar 2016, 01:37

brokenman wrote:Verdict: No good for getting version if your file name has a name-with-a-dash
the filename pattern proposed was name-version-suffix where name would be any chars, version only numbers with dots and suffix two dotted names. That is, there's no version suffix like -x86_64-1 after version and before extension.

If this condtition is true or at least separators used in that version suffix are different and not used in name section (and providing version suffix is part of version) you can solve the name-with-a-dash problem (or generally name-with-a-separator problem) with this code:

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V=${V##*[-:]}
supposing sepator chars allowed in name are - and : while not allowed in version suffix (using for example _ and +). Note you must explicity avoid . in brackets because it's used in version number.

proof of concept:

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% F=openldap-client-2.4.42+x86_64+1.tar.xz
% V=${F%.*.*}
% V=${V##*[-:]}
% echo $V
2.4.42+x86_64+1
% F=openldap-client:bundle-2.4.42+x86_64+1.tar.xz
% V=${F%.*.*}
% V=${V##*[-:]}
% echo $V
2.4.42+x86_64+1
If the two preconditions are not satisfized then you need a more advanced program (awk, sed...) or advanced bash options (extglob) using this code:

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V=${V##+(+([[:alpha:]])[-:_.+])}
Now you can also cover all extension possibilities (all like tar.xz , .tgz , .tar.gz.crypt , .why.not.a.bit.longer.1more ) with the code:

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shopt -s extglob
V=${F%%+(.+([[:alnum:]]))}
V=${V##+(+([[:alpha:]])[-:_.+])}
this way you have no conflict with version or suffix separator chars:

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% shopt -s extglob
% F=openldap-client-2.4.42+x86_64+1.tar.xz
% V=${F%.*.*}
% echo ${V##+(+([[:alpha:]])[-:_.+])}
2.4.42+x86_64+1
% F=openldap-client:bundle-2.4.42+x86_64+1.tar.xz
% V=${F%.*.*}
% echo ${V##+(+([[:alpha:]])[-:_.+])}
2.4.42+x86_64+1
% F=openldap-client:bundle.new-2.4.42-x86_64-1.tar.xz
% V=${F%.*.*}
% echo ${V##+(+([[:alpha:]])[-:_.+])}
2.4.42+x86_64+1
% F=openldap-client.2.4.42-x86_64-1.tar.xz1
% V=${V##+(+([[:alpha:]])[-:_.+])}
% echo ${V##+(+([[:alpha:]])[-:_.+])}
2.4.42-x86_64-1
% F=openldap.client.2.4.42-x86_64-1.tgz
% V=${F%%+(.+([[:alnum:]]))}
% echo ${V##+(+([[:alpha:]])[-:_.+])}
2.4.42-x86_64-1
% F=openldap.client.2.4.42-x86_64-1.why.not.a.bit.longer.1more
% V=${F%%+(.+([[:alnum:]]))}
% echo ${V##+(+([[:alpha:]])[-:_.+])}
2.4.42-x86_64-1
% F=openldap-client_bundle+kiosk-2.4.42-x86_64-1.tar.gz.crypt.2
% V=${F%%+(.+([[:alnum:]]))}
% V=${V##+(+([[:alpha:]])[-:_.+])}
% echo $V
2.4.42-x86_64-1

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Rava
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Re: convert a string / remove file name ending

Post#20 by Rava » 17 Mar 2016, 15:44

Who would have thought that my small question would create such great and in depth answers.


Anyhow, what do you suggest in doing in filtering out the x86-64 or i586 or i486 or even noarch or such part, and so for one having that in a variable of its own (e.g. $ARCH), and also to only get the version number, as in

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% F=openldap-client-2.4.42+x86_64+1.tar.xz
% F=openldap-client:bundle-2.4.42+x86_64+1.tar.xz
% F=openldap-client:bundle.new-2.4.42-x86_64-1.tar.xz
% F=openldap-client:bundle.new-2.4.42-x86_64-1.tar.xz
% F=openldap-client:bundle.new-2.4.42-x86_64-1.tar.xz.crypt
and resulting in
V=2.4.42
ARCH=x86_64-1 (or just x86_64 ?)
and NAME=openldap-client:bundle.new

Me thinks that solution would be most efficient for any all-purpose pBuild scripts that might cross our path now, or in the future..
Cheers!
Yours Rava

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