Also the for loop list needs to be in a certain format.
I usually put the values in a string and assign it to a variable, then let the shell expand the variable (via IFS i.e. white space and newline).
I have a directory which has 614,000 files.
When attempting to do an ls -ralt in the directory an error too many arguments is shown.
1. I would like to see what files and their stats in the directory
2. I would like to delete certain files of a certain age (3 Replies)
Hi everyone,
I have a file with multiple entries and I would like to remove the ones that contain either /A"> or /A/, where A can be any letter of the alphabet. Here's an example of the entries:
<Topic r:id="Top/World/Fran">
<catid>476</catid>
<link... (1 Reply)
Hello,
I've created a couple of files within a list using the command "ls -ltr | tail -2 > list" These files are the newest files placed within a directory. From the "list" file, I need to place the filenames as a variable. In which the newest file will be called "new_ctrl" the older file... (4 Replies)
I am trying to take a list of directories in a folder and give them a variable name. I have this working with the exception that the shell_exec command wants to place a return. Here is my code which might explain better what I am trying to do:
<?php
session_start();
$student1=$_SESSION;... (0 Replies)
Hello,
I need to run a command for a set of input variables that are present in a tab delimited file, a sample of which is shown below:
1 3749
1 4129
1 5980
2 6201
2 9925
2 6894
3 1338
3 6477
3 6242
3 3632
Every row represents the two input values... (2 Replies)
Hello,
I have this problem.
I have script file, e.g.
#!/usr/bin/ksh
echo $MY_DIR
ls -lt $MY_DIR
I want to list the script but with MY_DIR variable expanded. E.g.
MY_DIR=/abc/xyz (in shell MY_DIR is set)
So I want to list the script and see:
#!/usr/bin/ksh
echo /abc/xyz
ls... (6 Replies)
Hey all, I am simply trying to find a listing of all of the default BASH environment variables in RHEL 5.4. Namely, I need to find what the path variable is for libraries since one of my applications doesn't see a module that it needs to run. So far I've seen $LD_PRELOAD, $LD_LIBRARY_PATH and... (4 Replies)
Hi,
I'm primarily a Cisco/Juniper networking guy, so you'll have to forgive my ignorance when it comes to scripting (although I do write simple backup scripts and things of that nature on a regular basis and I run Linux at home, so I am vaguely familiar with it). What I need to do should be... (2 Replies)
Friends,
I observed a peculiar problem in shell.
if I set a variable using standard input and backspace was used by the user, then the variable get ^? characters embedded in the variable.
###
echo "Enter value for X="
read X
echo $X
expr $X + 1
###
If the variable is echoed, then there... (3 Replies)
I have googled this and found many solutions, but none of them are working for me. I am in a korn shell, most others reference bsh, maybe that is the issue? Anyway, all I am trying to do is use a variable I have declared in my main script in a remote shell I am running through ssh.
So I have a... (8 Replies)
Discussion started by: DJR
8 Replies
LEARN ABOUT SUSE
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
This loop prints every value in a list together with the square and cube of the value:
set values {1 3 5 7 2 4 6 8} ;# Odd numbers first, for fun!
puts "Value Square Cube" ;# Neat-looking header
foreach x $values { ;# Now loop and print...
puts " $x [expr {$x**2}] [expr {$x**3}]"
}
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)