First of all I am using C shell.
I have a variable destDirectory that holds a path.
the path includes an environment variable($user)
when I try to execute a command within the script, the $destDirectory gets replaced with the path, but the environment variable is not replaced. I end up... (2 Replies)
Hi,
I have to set bunch of variables and all other programs like make,
perl will use them ..
Here are my constraints and requirements ...
The variables have to be set by executing a script that runs
in c shell. I cannot source the script since people who use this
script might be on... (8 Replies)
Hi all,
I am running a Java program on a Linux server in which I read in a base directory path from the *.properties file. During processing, I build a unique file name and create a file to save data, concatenating the directory path and the file name. Works fine, except that I now need to... (2 Replies)
I've searched Google and now this forum. Best guess is my search fu is not good (and it probably isn't). The Google search did bring me here.
Background
I have a number of Korn Shell scripts who all use one of 3 values for an environment variable used in the backup system.
On occasion one or... (8 Replies)
Hi,
i have the following env variable. currently i am exporting variable in the same script file. but i need this is in a text file and the scripts need to export this variable from the text file.
can you please suggest me. is it possible.
export... (6 Replies)
I'm trying to make a sed substitution where the substitution pattern is an environment variable to be expanded, but the variable contains a "slash".
sed -e 's/<HOME_DIRECTORY>/'$HOME'/'This gives me the following error:
sed: -e expression #1, char 21: unknown option to `s'Obviously this is... (2 Replies)
I'm trying to search the 2 pattern in consecutive lines and print them but my variables are not resolving in sed (using bash shell) -
# cat testfile2.txt
Fixing Storage Locations to remove extra slash;
Fixing Storage Locations to remove extra slash;
Fixing Storage Locations to remove extra... (2 Replies)
Friends,
I trying to get the unix path fro a config file. There are 100 + path variables defined in the master_config.sh. Like this ;
app_dir=/project/emp
abc_dir=${app_dir}/abc/app
abc_common=${abc_dir}/common
abc_common_base=${abc_common}/base... (2 Replies)
Discussion started by: arunv123
2 Replies
LEARN ABOUT MOJAVE
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)