First post, so I hope someone can help me with this weirdness
I have a number files with some rows of information I want to extract, at the same time I want to add to a string some details from the file. I have found two different ways of looping over rows in a file, but one method doesn't let me concatenarte strings and I don't know why....
The first method sets the IFS environmental variable. I don't really favour this method, but it works..
and produces:
catdogdogdogdogdogdogdogdogdogdogdogdogdogdogdogdo gdogdogdogdogdogdogdogdogdogdogdogdog
Method 2 uses "read" but prevents the concatenation of the string:
and produces:
cat
Why is there a difference in the two methods? I would rather not be changing environmental variables and a simple loop is my preferred choice.
Thanks for your help, as this has been driving me crazy...
Stephen
my input file contains thousands of lines like below
234A dept of education
9788 dept of commerce
8677 dept of engineering
How do i add a delimeter ':' after FIRST 4 CHARACTERS in a line
234A:dept of education
9788:dept of commerce
8677:dept of engineering (7 Replies)
Hi All,
I am comparing two strings inside an if condition if the strings are same then it should go inside the loop else it should execute code given in else part.
But there is a but inside my script
Even if the if condition is true
it is not going inside the loop also it is executing... (4 Replies)
Hi All,
I need to concatenate the values in the array into a variable. Currently the code is :
for (( i=1 ; i <= $minCount ; i++ ))
do
var="${var}""${sample_file}"
done
The output is :
/tmp/1/tmp/2/tmp/3/tmp/4/tmp/5/tmp/6/tmp/7/tmp/8/tmp/9/tmp/10
I need a space between... (1 Reply)
Hi,
In the code included below, the string comparision is not working fine. Please help
while (( find_out >= i ))
do
file=`head -$i f.out|tail -1`
dir=`dirname $file`
cd $dir
Status=""
if ; then
Status=`cvs -Q status... (3 Replies)
The string comparison highlighted below is not working fine. Please help:
while read line
do
# Get File name by deleting everything that preceedes and follows Filename as printed in cvs status' output
f_name=`echo $line | sed -e 's/^File://' -e 's/ *Status:.*//' | awk '{print $NF}'`
... (4 Replies)
Hi there,
I'm writing a basic script where I want to make a string of 2 numeric fields from a file, which I have done, but the behavior is rather confusing.
I have a file of random values such as:
1 2
3 4
5 6
7 8
9 10
and my awk code is:
BEGIN { FS = " " }
{ str = str $1 $2 }
END {... (7 Replies)
Hello
I want to achieve the following.
However the concatenation is not working
mv `ls -ltr *myfile*.log|awk '{print $9}'` `ls -ltr *myfile*.log|awk '{print `date +'%d%m%y%k%M%S'` $9}'`
I tried
awk '{x=`date +'%d%m%y%k%M%S'` print $x "" $9}'
awk '{x=`date +'%d%m%y%k%M%S'`... (2 Replies)
Hi Team!!
Please can anyone tell me why the following line does not work properly?
str3+=$str2
it seems that str3 variable does not keep its value in order to be concatenated in the next iteration! Thus when i print the result of the line above it returns the str2 value
What i want to do is to... (8 Replies)
I have a script which is migrated from AIX to Linux & now while running it is no able to concatenate string values
The string concatenation step under while loop is not displaying desired result
Please find below the piece of code:
while read EXT_FILE ; do
EXT_FILE=$EXT_FILE.ext.sent
echo... (7 Replies)
Discussion started by: PreetArul
7 Replies
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)