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Full Discussion: Safely parsing parameters
Top Forums Shell Programming and Scripting Safely parsing parameters Post 302590155 by methyl on Saturday 14th of January 2012 11:18:34 AM
Old 01-14-2012
Quote:
I have a string like

Code:
root=/dev/sda3 noacpi foo "Baz mumble"
Sorry to be a pedant, or just plain thick! My question in post #10 still applies, but I'll rephrase it.
How did we arrive at the situation in post #1. i.e. What code, parameters or whatever produced or defined "root". I can achieve the assignment with backslashes but I just wondered whether is a free-standing command, a line from an parameter file or just (as I now suspect) a visual representation of what is in the environment variable without any syntax intended.

I have had a similar problem when writing a script to search thousands of alien scripts written to no particular standard. It was important that the search process never executed arbitary code.

Last edited by methyl; 01-14-2012 at 12:24 PM..
 

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chroot(1M)																chroot(1M)

NAME
chroot - change root directory for a command SYNOPSIS
newroot command DESCRIPTION
The command executes command relative to the newroot. The meaning of any initial slashes in path names is changed for command and any of its children to newroot. Furthermore, the initial working directory is newroot. Note that command suffixes that affect input or output for the command use the original root, not the new root. For example, the command: locates file relative to the original root, not the new one. The command variable includes both the command name and any arguments. The new root path name is always relative to the current root. Even if a is currently in effect, the newroot argument is relative to the current root of the running process. This command is restricted to users with appropriate privileges. EXTERNAL INFLUENCES
International Code Set Support Single- and multibyte character code sets are supported. WARNINGS
command cannot be in a shell script. Exercise extreme caution when referring to special files in the new root file system. does not search the environment variable for the location of command, so the absolute path name of command must be given. When using to establish a new environment, all absolute path name references to the file system are lost, rendering shared libraries inac- cessible. If continued access to shared libraries is needed for correct operation, the shared libraries and the dynamic loader be copied into the new root environment. SEE ALSO
chdir(2), chroot(2). STANDARDS CONFORMANCE
chroot(1M)
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