01-12-2009
Loop through the accounts and servers
Hi everyone, I am trying to use loop (for loop but can be any loop) which will read from the file (text file) which will have 2 column one for account and another for server which kind of look like this
account1 server1
account2 server2
account3 server1
account4 server1
5 server3
6 server2
7 server2
8 server3
9 server4
10 server4
now here I have to run couple of ksh scripts which i wrote (example tar, stop, start). I have to read from the text file and using those accounts and respective servers I have to login and run those scripts one at a time for all the accounts and respective servers.
If there are 10 accounts they may be in 3 or 4 differnt servers and may not be in sequence as i have writeen down above but thats not a big issue I can put that in some sequence if needed. Write now I am doing it using multiple text files. If I have accounts in 5 servers then I put five text files where I put accounts name and loop through them using resepctive server but I need some way to do that using one text file as I have written before.
I hope I made it clear this time if not i will try to elaborate more later on
I will really appreciate any help
thanks alot
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LEARN ABOUT REDHAT
foreach
foreach(n) Tcl Built-In Commands foreach(n)
__________________________________________________________________________________________________________________________________________________
NAME
foreach - Iterate over all elements in one or more lists
SYNOPSIS
foreach varname list body
foreach varlist1 list1 ?varlist2 list2 ...? body
_________________________________________________________________
DESCRIPTION
The foreach command implements a loop where the loop variable(s) take on values from one or more lists. In the simplest case there is one
loop variable, varname, and one list, list, that is a list of values to assign to varname. The body argument is a Tcl script. For each
element of list (in order from first to last), foreach assigns the contents of the element to varname as if the lindex command had been
used to extract the element, then calls the Tcl interpreter to execute body.
In the general case there can be more than one value list (e.g., list1 and list2), and each value list can be associated with a list of
loop variables (e.g., varlist1 and varlist2). During each iteration of the loop the variables of each varlist are assigned consecutive
values from the corresponding list. Values in each list are used in order from first to last, and each value is used exactly once. The
total number of loop iterations is large enough to use up all the values from all the value lists. If a value list does not contain enough
elements for each of its loop variables in each iteration, empty values are used for the missing elements.
The break and continue statements may be invoked inside body, with the same effect as in the for command. Foreach returns an empty string.
EXAMPLES
The following loop uses i and j as loop variables to iterate over pairs of elements of a single list. set x {} foreach {i j} {a b c d e f}
{
lappend x $j $i } # The value of x is "b a d c f e" # There are 3 iterations of the loop.
The next loop uses i and j to iterate over two lists in parallel. set x {} foreach i {a b c} j {d e f g} {
lappend x $i $j } # The value of x is "a d b e c f {} g" # There are 4 iterations of the loop.
The two forms are combined in the following example. set x {} foreach i {a b c} {j k} {d e f g} {
lappend x $i $j $k } # The value of x is "a d e b f g c {} {}" # There are 3 iterations of the loop.
SEE ALSO
for(n), while(n), break(n), continue(n)
KEYWORDS
foreach, iteration, list, looping
Tcl foreach(n)