Sponsored Content
Full Discussion: Eval
Top Forums Shell Programming and Scripting Eval Post 302798451 by rbatte1 on Wednesday 24th of April 2013 12:40:45 PM
Old 04-24-2013
I feel such a fool. Fortunately, I only use it to get an indirect variable or scheduled tasks reading in assignments from a parameter file that I control, which is a pretty rare need in itself.

Things such as:-
Code:
b=a
c=`eval echo $"{\`echo $b\`}"`

or
Code:
eval `grep "^GLOBAL:" $parmfile|cut -f2 -d":"`
eval `grep "^$JOBNAME:" $parmfile|cut -f2- -d":"`

.... where $parmfile contains statements such as:-
Code:
GLOBAL:COBRUN=cobrun
VALREP:VALREP.04146
QUOTES:COBRUN=qcobrun
VALUATION:export dd_REPORT=`grep "^VALREP:" $parmfile|cut -f2- -d":"`;echo dd_REPORT

I must admit that the parameter file is very closely guarded, but I agree it is susceptible to what you suggest.

I'm a little worried now...... Time to think a bit harder for older ksh. Any suggestions of a better way are very welcome.



Robin
 

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

EVal

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)
Discussion started by: Khoomfire
1 Replies

3. Shell Programming and Scripting

eval misconception

Hi, I have two files "foo" and "bar" $ cat foo a is \$a and b is \$b $ cat bar car tree using the below 'while' loop I expect the output to be: a is car and b is tree while read a b; do eval echo $(cat foo) # o/p: a is $a and b is $b eval "echo $(eval "cat foo")"... (1 Reply)
Discussion started by: royalibrahim
1 Replies

4. UNIX for Advanced & Expert Users

eval behaviour

Hi, I have snippet like the following x="1" prompt1="hi" if I say eval echo \$prompt$x then it is giving o/p "hi" if I say `eval echo \$prompt$x` here it is giving 1 ! if I add one more escape character i.e. `eval echo \\$prompt$x` then it is giving "hi" Can you please... (3 Replies)
Discussion started by: shahnazurs
3 Replies

5. Shell Programming and Scripting

eval help

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)
Discussion started by: BeefStu
5 Replies

6. Shell Programming and Scripting

eval

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)
Discussion started by: cesarNZ
4 Replies

7. Shell Programming and Scripting

Strange result of eval, how does eval really work with ssh?

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)
Discussion started by: summer_cherry
1 Replies

8. Shell Programming and Scripting

Help on eval please

Hello All, Since my variables are nested I use eval to populate the data. I have an ambiguity here when eval is used along with & say I have the below variable url="www.unix.com" , this come from function call as argument. I want to take this into another variable say... (6 Replies)
Discussion started by: sathyaonnuix
6 Replies

9. Shell Programming and Scripting

Error in eval eval command to print html tags

anyone has any info on why this is complaining??? vivek@vivek-c5e55ef2e ~/TAC $ zoneCounter=1 vivek@vivek-c5e55ef2e ~/TAC $ optUsage1=23% vivek@vivek-c5e55ef2e ~/TAC $ eval eval echo "<th>Zone $zoneCounter </th><th align=\"left\"> \$optUsage$zoneCounter </th>" -bash: syntax error... (1 Reply)
Discussion started by: vivek d r
1 Replies

10. Shell Programming and Scripting

Error in eval eval command to print html tags

anyone has any info on why this is complaining??? vivek@vivek-c5e55ef2e ~/TAC $ zoneCounter=1 vivek@vivek-c5e55ef2e ~/TAC $ optUsage1=23% vivek@vivek-c5e55ef2e ~/TAC $ eval eval echo "<th>Zone $zoneCounter </th><th align=\"left\"> \$optUsage$zoneCounter </th>" -bash: syntax error... (13 Replies)
Discussion started by: vivek d r
13 Replies
VM(1)								      mgetty								     VM(1)

NAME
vm - VoiceModem is the program for handling the voice modem functionality from shell scripts ACTIONS
beep options [<frequency [<length in 0.001sec>]]> diagnostics options device name (e.g. ttyS2 dial options phone number help play options [<file names]+> record options file name shell options [<shell script [shell options]]> wait options [<time in seconds]> devicetest OPTIONS
-c n use compression type n -d n set i/o device -t, -m, -i, -e, -s, -H equals to -d <2,3,4,5,6,7> -l s set device string (e.g. -l ttyS2:ttyC0) -v verbose output -w use off / on hook signal from local handset to start and stop recording -x n set debug level -L n set maximum recording length in sec -P print first DTMF tone on stdout and exit -R read and print DTMF string on stdout and exit -S s set default shell for shell scripts (e.g. -S /bin/sh) -T n set silence timeout in 0.1sec -V n set silence threshold to <n> (0-100%%) SEE ALSO
vgetty(1) POD ERRORS
Hey! The above document had some coding errors, which are explained below: Around line 30: You forgot a '=back' before '=head1' Around line 32: '=item' outside of any '=over' Around line 71: You forgot a '=back' before '=head1' perl v5.10.1 2010-04-04 VM(1)
All times are GMT -4. The time now is 06:20 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy