Gordon,
Date: Sat, 20 Feb 2016 16:40:01 -0800
From: Gordon Messmer <gordon.messmer@xxxxxxxxx>
To: Community support for Fedora users <users@xxxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: Bash / Escaping quotes is driving me crazy . .
Message-ID: <56C90761.4070509@xxxxxxxxx>
Content-Type: text/plain; charset=utf-8; format=flowed
On 02/20/2016 04:05 PM, Philip Rhoades wrote:
. . but why is there only a problem with the "flac" OR? - all three
files have at least one space in the filename:
Your mistake seems to be believing that the shell can understand the
way
you're nesting quotes. It can't. Each unescaped quote you're using
simply terminates the quoted string that preceded it. So your example:
ssh localhost "find
/home/phil/music/ambient/RobertGass+OnWingsOfSong/OmNamahaShivaya
-maxdepth 1 -type f \\( -name "*.mp3" -o -name "*.m4a" -o -name
"*.flac"
\\)"
There are the following quoted strings:
"find /home/phil/music/ambient/RobertGass+OnWingsOfSong/OmNamahaShivaya
-maxdepth 1 -type f \\( -name "
" -o -name "
" -o -name "
" \\)"
This means two things: First, the wildcards are unquoted when the
command is run on the remote system. Second, the wildcards are also
unquoted on the local system. So, if there are any mp3, m4a, or flac
files in the directory where you run that command, or in the default
login directory on the remote system, the wildcard will be expanded and
find will only search for files with that specific name.
Instead, use single quotes around the entire command, or escape both
the
quotes and the wildcards.
ssh localhost "find
/home/phil/music/ambient/RobertGass+OnWingsOfSong/OmNamahaShivaya
-maxdepth 1 -type f \\( -name \"\*.mp3\" -o -name \"\*.m4a\" -o -name
\"\*.flac\" \\)"
ssh localhost 'find
/home/phil/music/ambient/RobertGass+OnWingsOfSong/OmNamahaShivaya
-maxdepth 1 -type f \( -name "*.mp3" -o -name "*.m4a" -o -name "*.flac"
\)'
OK, that all makes sense but there is a further issue - I was trying to
keep it simple - this whole line is inside a Ruby "system" command ie:
system( "ssh .. " )
- so my working version is the same as your first option (without the
escaped '*'s) but with an extra '\' at each place. I can't use the
second option because I need to use double quotes so that I can use Ruby
variables inside the double quotes eg:
#{path}
Thanks for the explanation!
Regards,
Phil.
--
Philip Rhoades
PO Box 896
Cowra NSW 2794
Australia
E-mail: phil@xxxxxxxxxxxxx
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