01-11-2007
A question on SED
Hi Folks,
How do I pass a variable on sed (as a regular expression)???
I need to use a variable as a regexp in a sed command. The variable happens to be a time stamp which I fetch from another command.
To illustrate:
Suppose the value of variable var is....
var=10:20:22
I notice that this command doesn't work:
sed '1,/$var/d' textfile1
(I'm trying to delete the first line upto the first instance of var in the file textfile1.
Please help...tnx!
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LEARN ABOUT OPENSOLARIS
append
append(1T) Tcl Built-In Commands append(1T)
__________________________________________________________________________________________________________________________________________________
NAME
append - Append to variable
SYNOPSIS
append varName ?value value value ...?
_________________________________________________________________
DESCRIPTION
Append all of the value arguments to the current value of variable varName. If varName doesn't exist, it is given a value equal to the
concatenation of all the value arguments. The result of this command is the new value stored in variable varName. This command provides
an efficient way to build up long variables incrementally. For example, ``append a $b'' is much more efficient than ``set a $a$b'' if $a
is long.
EXAMPLE
Building a string of comma-separated numbers piecemeal using a loop.
set var 0
for {set i 1} {$i<=10} {incr i} {
append var "," $i
}
puts $var
# Prints 0,1,2,3,4,5,6,7,8,9,10
SEE ALSO
concat(1T), lappend(1T)
KEYWORDS
append, variable
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 append(1T)