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Shell Programming and Scripting
eval a variable that has a .
Post 302121053 by ttshell on Monday 11th of June 2007 01:23:55 PM
06-11-2007
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Hi everyone,
I do have the requirement to store the value of below result in a variable
eval echo $a
Please .... Help me , it's urgent to my sript
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x=0
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Hi,
i have an issue with eval and variable assignment.
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Hi Gurus,
I am having 2 parameters as below
parm1=value1
parm2=parm1
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if ]; then
do this.......
fi
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According to the POSIX specifications eval is a special shell built-in, which should imply that variable assignments specified together with it should remain in effect after the built-in completes. Thus one would expect IFS to be changed after this:
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pattern1=book
{
x=1
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}
book (this is the output)
But when I assign a variable to the output of the eval it doesn't work unless I prefix 2 times backslash before $ as shown below.
{
a=`eval echo \\$pattern$x`
echo $a
}
book
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LEARN ABOUT DEBIAN
explain_rename_or_die
explain_rename_or_die(3) Library Functions Manual explain_rename_or_die(3) NAME
explain_rename_or_die - change the name of a file and report errors SYNOPSIS
#include <libexplain/rename.h> void explain_rename_or_die(const char *oldpath, const char *newpath); DESCRIPTION
The explain_rename_or_die function is used to call the rename(2) system call. On failure an explanation will be printed to stderr, obtained from explain_rename(3), and then the process terminates by calling exit(EXIT_FAILURE). This function is intended to be used in a fashion similar to the following example: explain_rename_or_die(oldpath, newpath); oldpath The oldpath, exactly as to be passed to the rename(2) system call. newpath The newpath, exactly as to be passed to the rename(2) system call. Returns: This function only returns on success. On failure, prints an explanation and exits. SEE ALSO
rename(2) change the name or location of a file explain_rename(3) explain rename(2) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2008 Peter Miller explain_rename_or_die(3)