06-26-2006
Assigning output of command to a variable
Hi,
I'm trying to assign the output of a command to a variable and then concat it with another string, however, it keeps overwriting the original string instead of adding on to the end of the string.
Contents of test.txt --> This is a test
var1="`head -n 1 test.txt`"
echo $var1 (This is a test)
var1=$var1"123"
echo $var1 (123s is a test [instead of: This is a test123)
The issue has something to do with the first line. If I simply assign a string like this:
var1="This is a test" , then it all works, but when I try to assign the output of a command to a variable, it does not add to the string properly.
Does anyone know how to get around this??
Thanks!!
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LEARN ABOUT DEBIAN
concat
concat(3tcl) Tcl Built-In Commands concat(3tcl)
__________________________________________________________________________________________________________________________________________________
NAME
concat - Join lists together
SYNOPSIS
concat ?arg arg ...?
_________________________________________________________________
DESCRIPTION
This command joins each of its arguments together with spaces after trimming leading and trailing white-space from each of them. If all
the arguments are lists, this has the same effect as concatenating them into a single list. It permits any number of arguments; if no args
are supplied, the result is an empty string.
EXAMPLES
Although concat will concatenate lists, flattening them in the process (so giving the following interactive session):
% concat a b {c d e} {f {g h}}
a b c d e f {g h}
it will also concatenate things that are not lists, as can be seen from this session:
% concat " a b {c " d " e} f"
a b {c d e} f
Note also that the concatenation does not remove spaces from the middle of values, as can be seen here:
% concat "a b c" { d e f }
a b c d e f
(i.e., there are three spaces between each of the a, the b and the c).
SEE ALSO
append(3tcl), eval(3tcl), join(3tcl)
KEYWORDS
concatenate, join, lists
Tcl 8.3 concat(3tcl)