05-08-2008
Substr throws an ERROR. Any alternatives?
Can somebody please help me to remove the last character of a string.??
I have a string variable, in which I dynamically put values in a for loop.I want to remove the last character from the string.
But, the problem is I will not know which character can come in the string (Its inside for loop). So I tried using substr. substr does not work here.
Is there any alternative to do this?? Here my code goes.
....
for files in $rawSourceFiles
loop
MID_INFILE=`cat “${files}” | grep “Message-Id:"`
len=`expr “${MID_INFILE}” : ‘.*'`
len=`expr $len - 1`
trimmedMID_INFILE=`expr substr “${MID_INFILE}” 1 ${len}`
.....
...
done
But, it does not seem working. It throws an error “expr: syntax error” ..
What all I want here is in trimmedMID_INFILE should be the string MID_INFILE with last character trimmed. (last char could be anything like "\n", "/", etc.)
Can anybody please enlighten me?? I would be so grateful. Thanks in advance.
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LEARN ABOUT DEBIAN
foreach
foreach(3tcl) Tcl Built-In Commands foreach(3tcl)
__________________________________________________________________________________________________________________________________________________
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(3tcl), while(3tcl), break(3tcl), continue(3tcl)
KEYWORDS
foreach, iteration, list, looping
Tcl foreach(3tcl)