If its a file how does the system know it has to read the content? (my system cant ...(ksh) )
e.g. (AIX 6.1...)
Q2 : there is no difference (except indentation...) between the 2 portions of code you submitted: A loop that starts when the previous finishes is a sequence... so one after the other...
Last edited by vbe; 12-16-2011 at 09:30 AM..
Reason: add code sample
i don't get what's wrong here. i'm writing a shell script that takes 1 argument (a number) from the command-line, but it's throwing an error:
Syntax error: Bad for loop variable
doesn't make much sense
for (( i = 1; i = ${1}; i++ )) # error points to this line everytime
do
echo... (9 Replies)
Hi,
I have the following script (compile_mercury) and I get this error: I have no idea why...and I have written this script completely in linux (bash) and not in windows.
****************
./compile_mercury: line 136: syntax error near unexpected token `done'
./compile_mercury: line 136:... (1 Reply)
Hi guys,
I'm trying to loop through a number of files that is set by whatever is in a field.
eg.
The idea is to split FILELIST down into fields, it could contain 1 - 999 fields and it's bar delimited.
I thought simple, count the number of fields in the field and then loop... (1 Reply)
hi,
I have to use for loop in my script. The below code is providing an output,
1,2,3,4,5..n. But i need to display the values one by one eg: it has to display the first value then exit from the loop and display the second value then exit till n(last value).
for i in 1,2,3,4,5..n
do ... (2 Replies)
I am trying to run a menu option though IF loops. I keep getting errors not allowed the menu to be processed correctly. Currently it will accept the first 2 statements but then crash on the 3rd. The 2nd and 3rd have the same syntax, so I do not understand why it breaks.
#!/bin/bash
while... (4 Replies)
can some one please tell me what is the problem with my syntax:confused:
I have 100 files in one folder
1. want to read each of the line by line
2. calculate their number of the words between the first word and the last word of each line
3. create file for each file with number of words... (8 Replies)
I am using simple for loop, but getting syntax error when I run the code
code
#!/bin/ksh
pls enter number
read n
for(i=1; i<=n; i++)
do
echo $i
done
syntax error
+ pls enter number
+ read n (5 Replies)
I have a shell script which has this while loop line
"while read tblName xx; do..."
I understand how while loop works but don't know what does this xx stands for? (1 Reply)
I like to “optimize” / make more like a real program my bash script by replacing repetitious code which utilizes positional parameters.
I am having two issues I cannot solve and would appreciate some assistance with resolving them.
a) how to modify the whiptail checklist... (3 Replies)
Discussion started by: annacreek
3 Replies
LEARN ABOUT OPENDARWIN
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)