Writing to variables within a loop

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Writing HTML with variables from an array or other means

Hello! I wish to create a script that will automate the creation of HTML files... for example, if my HTML starts out containing: <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>$TITLE</title> </head> I want to put that into something that I can read and write later on. My...

2. UNIX for Dummies Questions & Answers

[Solved] Writing a loop to changing the names of files in a directory

Hi, I would like to write a loop to change the names of files in a directory. The files are called data1.txt through data1000.txt. I'd like to change their names to a1.txt through a1000.txt. How do I go about doing that? Thanks!

3. UNIX for Dummies Questions & Answers

Writing a for loop to manipulate multiple files

Hi, I have 1000 text files in a folder that are labeled data1.txt all the way to data1000.txt. I want to write a small script that manipulates the text files in this way: (1) cut the 2nd and 9th columns of the text files (2) sort by the numerical value in the 9th column (3) then save the rows...

4. UNIX for Dummies Questions & Answers

Writing a loop to merge multiple files by common column

I have 100 data files labelled 250.1.txt through 250.100.txt. The second column of the data files partially match (there is about %90 overlap). Each data file has 4 columns. I want the merge all these text files by the matching values in the second column. In the output, the first column should...

5. UNIX for Dummies Questions & Answers

Writing a loop to manipulate a script and store it in multiple output files

I have a script where the the 9th line looks like this: $filename=sprintf("250.1chr%d.ped", $N); I want to modify this script 1000 times, changing 250.1chr%d.ped to 250.2chr%d.ped, 250.3chr%.ped.......and so on all the way to 250.1000chr%d.ped and store each output in files called ...

6. UNIX for Dummies Questions & Answers

Writing a for loop that processes multiple input files

I would like to write a for loop that does the following: I have a file called X.txt and other files called 1.txt,2.txt, .....,1000.txt. I want to substitute the 6th column of the file X.txt with 1.txt and store the output as X.1. Then I want to do the same with X.txt and 2.txt and store the...

7. Shell Programming and Scripting

Using variables created sequentially in a loop while still inside of the loop [bash]

I'm trying to understand if it's possible to create a set of variables that are numbered based on another variable (using eval) in a loop, and then call on it before the loop ends. As an example I've written a script called question (The fist command is to show what is the contents of the...

8. Shell Programming and Scripting

Writing a simple loop in perl

Dear all, I am a complete newbie to (perl) programming and I am completely stuck in a project. I have the following arrays @array_1 @array_2 @array_A @array_B @array_C Each element pair of array_1 and array_2 is linked to all elements of a third array (e.g. array_A, array_B or...

9. Shell Programming and Scripting

Is there a better way I could have run this loop. (For loop with two variables)

Sorry for such a dreadful title, but I'm not sure how to be more descriptive. I'm hoping some of the more gurutastic out there can take a look at a solution I came up with to a problem, and advice if there are better ways to have gone about it. To make a long story short around 20K pieces of...

10. UNIX for Dummies Questions & Answers

Writing variables into a new file

echo "Please enter your surname\n" echo "followed by your first name:\c" read name1 name2 echo "Thank you" echo "Now please enter your age" read age echo "Thanks again, we're nearly done. Please enter your town of birth" read town echo "Hi there $name2 $name1" sleep 3 echo "erm..." sleep...

LEARN ABOUT OPENSOLARIS

foreach

foreach(1T)						       Tcl Built-In Commands						       foreach(1T)

__________________________________________________________________________________________________________________________________________________

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(1T), while(1T), break(1T), continue(1T)

KEYWORDS

       foreach, iteration, list, looping

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWTcl	      |
       +--------------------+-----------------+
       |Interface Stability | Uncommitted     |
       +--------------------+-----------------+
NOTES

       Source for Tcl is available on http://opensolaris.org.

Tcl																       foreach(1T)

UNIX for Dummies Questions & Answers