03-29-2002
Hi
you can use the substr function of awk. For more details do a man awk and you will find it.
Hope this helps
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Okay I will let users input spaces as well :)
I am having a mental block. I have done a couple of searches but havent found anything that I understand (the likes of :alpha: and awk).
Basically I want to give the user an option to enter some text which will go down as a field within a flat... (3 Replies)
Discussion started by: tugger
3 Replies
2. UNIX for Dummies Questions & Answers
Hi! I'm using
echo $string | grep "" -c
to test in a script if a string is a number and it seems to work. But how can i find, for example, if a string is a four figures number ?
Thanks to all! (2 Replies)
Discussion started by: Kaminski
2 Replies
3. Shell Programming and Scripting
This is the code:
while test 1 -eq 1
do
read a
$a
if test $a = stop
then
break
fi
done
I read a command on every loop an execute it.
I check if the string equals the word stop to end the loop,but it say that I gave too many arguments to test.
For example echo hello.
Now the... (1 Reply)
Discussion started by: Max89
1 Replies
4. Shell Programming and Scripting
How to check weather a string is like test* or test* ot *test* in if condition (5 Replies)
Discussion started by: johnjerome
5 Replies
5. Shell Programming and Scripting
How do I test multiple words in a string test like below:
if ]
then
print "You entered $TBS name.\n"
else
print "You entered an incorrect response.\n"
fi
This test does not work. I have tried different syntax versions. How does this work? And is there a better way to do it?
... (10 Replies)
Discussion started by: djehresmann
10 Replies
6. Shell Programming and Scripting
Hi there, I have a bunch of interface names like
e1000g0
nge1
dmfe3
I also have some that have longer (vlan tagged) names
like
e1000g123001
nge23003
e1000g999002
I need to determine whether the interface is one of the former or latter types and I would do that by seeing... (7 Replies)
Discussion started by: rethink
7 Replies
7. Shell Programming and Scripting
How do I use bash to test whether a string occurs more than two times in a file? (2 Replies)
Discussion started by: locoroco
2 Replies
8. Shell Programming and Scripting
How do I use bash to test if a line begins with a random number of spaces followed by a letter? (1 Reply)
Discussion started by: locoroco
1 Replies
9. Shell Programming and Scripting
Hi guys
I am performing a simple test for a blank string with the following code:
if ] ]] ; then
echo "Blanks are NOT a valid input "
return 1
fi
The above fails giving a syntax error message:
syntax error at line 142 : `=~' unexpected
I am in ksh88
is there... (2 Replies)
Discussion started by: aoussenko
2 Replies
10. Shell Programming and Scripting
I want to find whether string values are available in a field of a file. Let it be any character other than number . I just want to know whether characters will be available in it . Please share a single step command for this without creating a shell script. (5 Replies)
Discussion started by: Sang
5 Replies
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)