I agree with the above and again:eval if used this way on external, user controlled parameters is especially dangerous. It should not be used this way!
Further observations:
the while true loop is faulty. There is no default case and the loop only ends when there is the option --. If that is left out, no shifting takes place, so the script will enter an infinite loop. A while true loop is not the way one would normally do option handling with getopts anyway.
The unquoted function parameter $@ may alter the script's command line parameters when it passes it to the function. There should be double quotes around it..
The test for the number of non-option parameters is never reached [ "$#" -ne 0 ] when there are no options either..
We haven't been told what operating system or shell are being used for these tests, but if we use bash, ksh, sh, or zsh on macOS with the BSD based getopt utility available on that system (which says it was designed to behave the same as the Bell Labs getopt utility I described in post #3 in this thread), the command:
would set OPTS to:
if the script is invoked with the command:
and after the command:
is run, the positional parameters will be set to:
There are lots of things wrong with the script that has been posted for discussion in this thread many of which have already been mentioned at least once.
Instead of what this getopt utility is doing, to make the following while loop work correctly getopt with the shown arguments would have to return the string:
instead of:
Rather than trying to understand how this script works, you would be much better off taking the time to learn how to rewrite the script using getopts (perhaps using suggestions in the thread How to Use getopts with longoptions? from a couple of years ago as a starting point).
Hi,
There is an Informatica tool through which unix scripts can be called. Now the requirement in my project is that a parent script calls a child script but this parent script has to be called through the Informatica tool.
In Parent script I'm using
TEMP=`getopt -o x:y: -l area:,volume:... (1 Reply)
Hi all,
some small script with eval turned me to crazy.
my OS is linux
Linux s10-1310 2.6.16.53-0.8.PTF.434477.3.TDC.0-smp #1 SMP Fri Aug 31 06:07:27 PDT 2007 x86_64 x86_64 x86_64 GNU/Linux
below script works well
#!/bin/bash
eval ssh remotehost date
eval ssh remotehost ls
below... (1 Reply)
hi all,
Am trying to add some code to a ksh script and i dont understand how an eval function is used :
_var=$1
_conceal=$2
eval _val=\$${_var}
can someone shed some light on what the eval function in the above context means/does ??
thanks. (4 Replies)
I am trying to expand the variable $user in my alias command and tried
several variations of eval but can't seem to get it to work.
The end result should be either:
oracle_user='sudo su - oracle ' or oracle_user='sudo su - oracle1 '
user=$(grep '^oracle:' /etc/passwd | cut... (5 Replies)
first of all, thanks to all on this board, it has been a huge resource to answer most of my questions!
I am stuck on something that should really be simple, and was looking for some help.. I am using KSH on solaris and working on a script to move containers from server to server. Where i am... (4 Replies)
Hi All,
I'm running some encrypted data through a script I wrote. In order to do this, I'm using eval to resolve some of my variables. At the moment, when I use eval to resolve, it strips out some of my encrypted values, and totally drops some others. For example if I have the value ab1"3 it drops... (1 Reply)
Okay this is a mess, I'm trying to assign variables with variables in a for-loop. Here is what i have for code. The syntax is not good.
Given the following script:
#! /bin/csh
foreach site (ABC DEF GHI)
eval set \t$${site}sf = ``wc -l \$${site}.sf | awk '{print $1}'``
eval set... (2 Replies)