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Top Forums Shell Programming and Scripting Escaping problem in a shell script Post 302721419 by Corona688 on Thursday 25th of October 2012 11:22:27 AM
Old 10-25-2012
Quote:
Originally Posted by franko007
thank you i will try this tomorrow when i have access to my workstation again.
but to make this clear, i need the single quotes in the gnuplot command because the flag -e expects a list of "commands" seperated by ";" within quotes (' ')
You've missed the point, not to mention seem confused about how quoting works.

The quotes are for the shell, not gnuplot. They tell a string not to split. GNUplot doesn't care about them. GNUplot doesn't see them, and shouldn't see them.

Code:
# quotes are not echoed.  The shell removes them before echo is run.
$ echo 'asdf'

asdf

# quotes are not echoed.  The shell removes them before echo is run.
$ echo "asdf"

asdf

$

If you're feeling masochistic, you can do this completely without quotes just by escaping everything:

Code:
gnuplot -e name=\'${1}.dat\'\;col=2 gplscript.gpl

...and gnuplot will swallow it happily as long as $1 contains no spaces. GNUplot doesn't care. It gets the exact same string once the shell's through with it.

Last edited by Corona688; 10-25-2012 at 12:28 PM..
 

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ShellQuote(3)						User Contributed Perl Documentation					     ShellQuote(3)

NAME
String::ShellQuote - quote strings for passing through the shell SYNOPSIS
$string = shell_quote @list; $string = shell_quote_best_effort @list; $string = shell_comment_quote $string; DESCRIPTION
This module contains some functions which are useful for quoting strings which are going to pass through the shell or a shell-like object. shell_quote [string]... shell_quote quotes strings so they can be passed through the shell. Each string is quoted so that the shell will pass it along as a single argument and without further interpretation. If no strings are given an empty string is returned. If any string can't be safely quoted shell_quote will croak. shell_quote_best_effort [string]... This is like shell_quote, excpet if the string can't be safely quoted it does the best it can and returns the result, instead of dying. shell_comment_quote [string] shell_comment_quote quotes the string so that it can safely be included in a shell-style comment (the current algorithm is that a sharp character is placed after any newlines in the string). This routine might be changed to accept multiple string arguments in the future. I haven't done this yet because I'm not sure if the strings should be joined with blanks ($") or nothing ($,). Cast your vote today! Be sure to justify your answer. EXAMPLES
$cmd = 'fuser 2>/dev/null ' . shell_quote @files; @pids = split ' ', `$cmd`; print CFG "# Configured by: ", shell_comment_quote($ENV{LOGNAME}), " "; BUGS
Only Bourne shell quoting is supported. I'd like to add other shells (particularly cmd.exe), but I'm not familiar with them. It would be a big help if somebody supplied the details. AUTHOR
Roderick Schertler <roderick@argon.org> SEE ALSO
perl(1). perl v5.16.3 2010-06-11 ShellQuote(3)
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