Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Safe way to eval variable declarations?
Top Forums Shell Programming and Scripting Safe way to eval variable declarations? Post 302910169 by Chubler_XL on Wednesday 23rd of July 2014 12:31:23 AM
Old 07-23-2014
I'd suggest not using eval at all, just code your own allowed expansions e.g.:

Code:
expand='$RANDOM'
[ ${expand:0:1} = "$" ] && {
   expand=${expand:1}
   expand=${!expand}
}

So here we support $var and not $(command)
This User Gave Thanks to Chubler_XL For This Post:
Michael Stora
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

eval a variable that has a .

Hi, Is there any way that I can eval the following - eval abc.csv=def.csv I am getting the - bash: command not found error. thanks. (3 Replies)
Discussion started by: ttshell
3 Replies

2. Shell Programming and Scripting

How to assign eval value as Variable..

Im facing problem in assigning value of eval array variable as normal variable.. x=0 eval DATA${x}="FJSVcpcu" x=`expr $x + 1` eval DATA${x}="FJSVcsr" if x=0, type -> eval echo \$DATA$x , its give me FJSVcpcu i want assign this value into an variable as variable=`eval echo... (3 Replies)
Discussion started by: neruppu
3 Replies

3. Shell Programming and Scripting

bin/sh eval variable assignment

Why can't I do this? eval "TEST=5;echo $TEST;"; THIS WORKS!! TEST=5;echo $TEST; (2 Replies)
Discussion started by: blasto333
2 Replies

4. Shell Programming and Scripting

Passing eval value to a variable

Hello, I have a script that does an scp to a server and then gets the number of process running on that server, the o/P should be stored in a variable for further processing eval `echo "ssh -q $Infa_user@$host 'csh -c $CMD '"` where CMD="ps -ef | grep -i ${INFA_REPO} | grep -v grep | wc... (2 Replies)
Discussion started by: amit1_x
2 Replies

5. Shell Programming and Scripting

Help with eval usage for string containing Environment Variable

Help !! First, Thanks in Advance Here is what I have I have an environment Variable, let's call it v_VALUE. v_VALUE="\$ORACLE_HOME/bin" Hence, the location is ORACLE_HOME is not evaluated. ORACLE_HOME happens to be /app/oracle/product/10.1.2 I need a method of returning the... (1 Reply)
Discussion started by: dhangliter
1 Replies

6. Shell Programming and Scripting

eval and variable assignment

Hi, i have an issue with eval and variable assignment. 1) i have a date value in a variable and that date is part of a filename, var1=20100331 file1=${var1}-D1-0092.xml.zip file2=${var2}-D2-0092.xml.zip file3=${var3}-D3-0092.xml.zip i am passing the above variables to a script via... (11 Replies)
Discussion started by: mohanpadamata
11 Replies

7. Shell Programming and Scripting

assignment to variable from eval command

Hi Gurus, I am having 2 parameters as below parm1=value1 parm2=parm1 I want to evaluate parm1 value using eval echo \$$parm2 and later i want to assign this value to other variable which i will be using in if statement like : if ]; then do this....... fi could you please suggest... (5 Replies)
Discussion started by: k_vikash
5 Replies

8. UNIX for Advanced & Expert Users

Variable assignments specified with eval shell built-in

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: var=$'a\nb c' $ IFS=$'\n' eval ' for i in... (4 Replies)
Discussion started by: Scrutinizer
4 Replies

9. Shell Programming and Scripting

assign multiple rows value to a variable using eval

background : Solaris, ksh metresult="ooo > pp" ts=89 eval append_${ts}="$metresult" bash: pp: command not found I want to create a variable which has in a part of its name a dynamically-established number (stored in another variable) usually I do this with eval command. The problem I... (5 Replies)
Discussion started by: black_fender
5 Replies

10. Shell Programming and Scripting

'eval' used in variable assignment

pattern1=book { x=1 eval echo \$pattern$x } 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 Why here twice "\" has to be... (3 Replies)
Discussion started by: ravisingh
3 Replies

LEARN ABOUT DEBIAN

pmksetup

PMKSETUP(8)						    BSD System Manager's Manual 					       PMKSETUP(8)

NAME

     pmksetup -- premake setup

SYNOPSIS

     pmksetup [-hVv] [-r variable] [-u variable=value]

DESCRIPTION

     The pmksetup utility is meant to create or update the pmk.conf(5) file in order to run the pmk(1) configuration tool.

     pmksetup reads all configuration information from the pmk.conf(5) file.

     The options are as follows:

     -h      Display the help menu.

     -r variable
	     Remove the given variable from pmk.conf(5) if its value isn't static.  Data gathering is skipped by this option.

     -u variable=value
	     Add or update existing variable from pmk.conf(5) if its value isn't static.  The value must have its double quotes escaped to pass
	     through shell filter.  Data gathering is skipped by this option.

     -V      Verbose, display debugging messages.

     -v      Display the version number.

FILES

     /etc/pmk/pmk.conf	default pmk(1) configuration file

SEE ALSO

     make(1), pmk(1), pmkscan(1), pmk.conf(5), pmkfile(5)

AUTHORS

     Damien Couderc and Xavier Santolaria.

BSD
								  April 03, 2003							       BSD
All times are GMT -4. The time now is 08:31 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy