04-18-2011
Can you post your script..at least the loop portion..?
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I am facing some strange problem.
I know, there is only one record in a file 'test.txt' which starts with 'X'
I ensure that with following command,
awk /^X/ test.txt | wc -l
This gives me output = '1'.
Now I take out this record out of the file, as follows :
awk /^X/ test.txt >... (1 Reply)
Discussion started by: videsh77
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2. Shell Programming and Scripting
countA=`awk '/X/''{print substr($0,38,1)}' fName | wc -l`
countB=`wc -l fName | awk '{print int($1)}'`
echo > temp
ratio=`awk -va=$countA -vc=$countB '{printf "%.4f", a/c}' temp`
After running script for above I am getting an error as :
awk: 0602-533 Cannot find or open file -vc=25.
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Discussion started by: videsh77
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3. UNIX for Advanced & Expert Users
# cat test
<abc>
</abc>
<abc>
</abc>
# sed 's/abc/checker/' test>test1
# cat test1
<checker>
</checker>
<checker>
</checker>
#
I want the first instance of abc to be changed to checker. But all(rest 3 also) are changed. I din't used global (g) option too..
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while i've used arrays to work with variables, i've never used them to loop through a set of strings and wanted to ask the community for some feedback or assistance.
let me be specific. here's my code:
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This is my ubuntu version:
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No LSB modules are available.
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Description: Ubuntu 16.04.4 LTS
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Codename: xenial
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LEARN ABOUT OPENDARWIN
while
while(n) Tcl Built-In Commands while(n)
__________________________________________________________________________________________________________________________________________________
NAME
while - Execute script repeatedly as long as a condition is met
SYNOPSIS
while test body
_________________________________________________________________
DESCRIPTION
The while command evaluates test as an expression (in the same way that expr evaluates its argument). The value of the expression must a
proper boolean value; if it is a true value then body is executed by passing it to the Tcl interpreter. Once body has been executed then
test is evaluated again, and the process repeats until eventually test evaluates to a false boolean value. Continue commands may be exe-
cuted inside body to terminate the current iteration of the loop, and break commands may be executed inside body to cause immediate termi-
nation of the while command. The while command always returns an empty string.
Note: test should almost always be enclosed in braces. If not, variable substitutions will be made before the while command starts execut-
ing, which means that variable changes made by the loop body will not be considered in the expression. This is likely to result in an
infinite loop. If test is enclosed in braces, variable substitutions are delayed until the expression is evaluated (before each loop iter-
ation), so changes in the variables will be visible. For an example, try the following script with and without the braces around $x<10:
set x 0
while {$x<10} {
puts "x is $x"
incr x
}
SEE ALSO
break(n), continue(n), for(n), foreach(n)
KEYWORDS
boolean value, loop, test, while
Tcl while(n)