Now that I have just the numbers displayed within the file is there anyway I can call upon the numbers in a script so I can perform the workings out on them?
What i'm trying to achieve to get is the difference between the readings:
but I'm not sure on how to get these random numbers into a script.
I have a few thoughts:
Should I turn them into variables within the file and then use the variables in my script
ie edit the text file from my script and turn each number into a variable, so it'll look something like this:
then call upon them in my script to do the maths - how would I assign the varibles within my script and how do I get these variables into my script?
OR:
is there a way to select line 1 from the file and make it a variable in my script then line 2 etc (remembering that these numbers are random so "greping" will not work).
Regards
If you get the numbers by themselves in a file, you can do the below to set them to variables.
I have a file which contains lots of text (comment field). I would like to parse through the comment field which can be up to 255 characters long and look for anything that seems to resemble, say, a credit card number or customer account number, etc. and replace the numbers with asteriks (*).
... (9 Replies)
Is anyone know some scripts to generate random number without repetition using bash; for example generate 10 different random numbers.
Thanks (8 Replies)
i want to need script..
source.txt
/home/user1/public_html/test3
/home/user90/public_html/test9
.
.
.
/home/user650/public_html/test000
read source.txt and cd /home/user**/public_html/***
and there is 1.txt, 2txt ~~25.txt
and select 6 text files randomly among the... (4 Replies)
Hello,
I need to take a random word from a flat text file with words in it seperated by spaces.
The code I am using, always gives me the first word. Can anyone please shed some light on this. Here's my code.
Thanks
echo table roof ceiling jar computer monitor keyboard carpet >... (5 Replies)
I have a text file with hundreds of lines, i wish to run a script and reads a random line to pass it to another command line such as:
for line in `cat file |grep random line`; do echo $line |mail my@example.com ; done
thank you (6 Replies)
Hi,
I am trying to extract lines from a text file given a text file containing line numbers to be extracted from the first file. How do I go about doing this? Thanks! (1 Reply)
Hi,
I am new to Unix/ksh script and will like to check how do I retrieve just the count of '258' in the last line in a text file ?
There will be this "TRL" appended with number of count at the last line in a text file .
TRL0000000258
var=`grep 'TRL' $HOME/folder/test.txt | wc -l`
... (12 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
Write a shell script that will take the sum of two random number?
Ex: Random n1 +Random n2 = result
i tries to write it but i had some dufficulties
... (3 Replies)
Discussion started by: renegade755
3 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)