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 OPENSOLARIS
concat
concat(1T) Tcl Built-In Commands concat(1T)
__________________________________________________________________________________________________________________________________________________
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 (so the command:
concat a b {c d e} {f {g h}}
will return "a b c d e f {g h}" as its result), it will also concatenate things that are not lists, and hence the command:
concat " a b {c " d " e} f"
will return "a b {c d e} f" as its result.
Note that the concatenation does not remove spaces from the middle of its arguments, so the command:
concat "a b c" { d e f }
will return "a b c d e f" (i.e. with three spaces between the a, the b and the c).
SEE ALSO
append(1T), eval(1T)
KEYWORDS
concatenate, join, lists
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Availability | SUNWTcl |
+--------------------+-----------------+
|Interface Stability | Uncommitted |
+--------------------+-----------------+
NOTES
Source for Tcl is available on http://opensolaris.org.
Tcl 8.3 concat(1T)