I was able to get the eval to work but no luck on the read. I'm curious because I don't want someone accidentally running a command. However, after a few hours of trying different combinations, read wouldn't resolve a string. Take the following sample, the script would just hang.
Per my samples where I pass in boe, I figured it would've resolved the ${system} to be boe and then look up boeServer in the ftpLogins file. In the end, I expect the variable server to have the value ftp1. While I'm happy for the eval solution, security wise I'd love to use read if I could.
Say I write something like the following:
var1=1
var2=2
for int in 1 2
do
echo "\$var$int"
done
I want the output to be:
1
2
Instead I get something like:
$var1
$var2 (2 Replies)
in a text " Korn Shell Unix programming Manual 3° Edition"
i have found this sintax to declare a compoud variable:
variable=(
fild1
fild1
)
but this sintax in ksh and sh (HP-UNIX) not work...
why?? exist another solution for this type of variable ??? (5 Replies)
I am using two shell scripts a.ksh and b.ksh
a.ksh
1. Sets the value
+++++++++++++++++
export USER1=abcd1
export PASSWORD=xyz
+++++++++++++++++
b.ksh
2. Second scripts calls sctipt a.ksh and uses the values set in a.ksh and pass to an executable demo... (2 Replies)
Hi
I have the following block of code in korn shell and don't now how to refer to variable `print variable1.$dvd` ?
---
integer dvd=4
integer number=0
while (( dvd!=0 ))
do
print "Iteracja numer : $dvd"
print "$_" #it refers to $dvd var but want to refer... (3 Replies)
this is my issue.
4 parameters are passed from korn shell to sql script.
parameter_1= varchar2 datatype or no value entered my user.
parameter_2= number datatype or no value entered my user.
parameter_3= number datatype or no value entered my user.
parameter_4= number datatype or no... (5 Replies)
Simple enough problem I think, I just can't seem to get it right.
The below doesn't work as intended, it's just a function defined in a much larger script:
CheckValues() {
for field in \
Group_ID \
Group_Title \
Rule_ID \
Rule_Severity \
... (2 Replies)
Hi
I am using two shell scripts which are running on the system simultaneously. And in one of the script i am exporting an Integer Variable.
Now i want to use the variable in another script. But i cannot run the first script in the second as the first script has many other functions which... (3 Replies)
I have following files at /dir1
a.csv.20131201
b.csv.20131201
c.csv.20131201
d.csv.20131201
a.csv.20131202
b.csv.20131202
c.csv.20131202
d.csv.20131202
.......................
.......................
.......................
.......................
I need to move these files to... (4 Replies)
I have written a script which will take input parameter as another script.
However, if the script passed as input parameter has parameters then this script doesn't work.
I have a script b.ksh which has 1 and 2 as parameters
I have a script c.ksh which has 3,4 and 5 as parameters
vi a.ksh... (1 Reply)
Discussion started by: Vee
1 Replies
LEARN ABOUT SUSE
eval
eval(n) Tcl Built-In Commands eval(n)
__________________________________________________________________________________________________________________________________________________NAME
eval - Evaluate a Tcl script
SYNOPSIS
eval arg ?arg ...?
_________________________________________________________________DESCRIPTION
Eval takes one or more arguments, which together comprise a Tcl script containing one or more commands. Eval concatenates all its argu-
ments in the same fashion as the concat command, passes the concatenated string to the Tcl interpreter recursively, and returns the result
of that evaluation (or any error generated by it). Note that the list command quotes sequences of words in such a way that they are not
further expanded by the eval command.
EXAMPLES
Often, it is useful to store a fragment of a script in a variable and execute it later on with extra values appended. This technique is
used in a number of places throughout the Tcl core (e.g. in fcopy, lsort and trace command callbacks). This example shows how to do this
using core Tcl commands:
set script {
puts "logging now"
lappend $myCurrentLogVar
}
set myCurrentLogVar log1
# Set up a switch of logging variable part way through!
after 20000 set myCurrentLogVar log2
for {set i 0} {$i<10} {incr i} {
# Introduce a random delay
after [expr {int(5000 * rand())}]
update ;# Check for the asynch log switch
eval $script $i [clock clicks]
}
Note that in the most common case (where the script fragment is actually just a list of words forming a command prefix), it is better to |
use {*}$script when doing this sort of invocation pattern. It is less general than the eval command, and hence easier to make robust in |
practice. The following procedure acts in a way that is analogous to the lappend command, except it inserts the argument values at the
start of the list in the variable:
proc lprepend {varName args} {
upvar 1 $varName var
# Ensure that the variable exists and contains a list
lappend var
# Now we insert all the arguments in one go
set var [eval [list linsert $var 0] $args]
}
However, the last line would now normally be written without eval, like this: |
set var [linsert $var 0 {*}$args] |
SEE ALSO
catch(n), concat(n), error(n), interp(n), list(n), namespace(n), subst(n), tclvars(n), uplevel(n)
KEYWORDS
concatenate, evaluate, script
Tcl eval(n)