Thanks for the feedback. I searched the man pages but I don't see any good examples for substr usage with awk. Do you have any examples out there that you can share?
awk substr is just for pulling part of a string, and is not used for string testing, although the operands of substr, such as starting position and length, can involve string testing. For example, the substr operand for starting position could be an index function for locating a desired starting position using a pattern match.
Following is an example using awk to test for six digits. Unlike the expr command, which has an assumed beginning-of-line anchor, this pattern has to be anchored at the front. The ! means NOT, so if the input is not exactly six digits, it will exit with code 1, else code 0.
Code:
echo $myvar |
awk '!/^[0-9]{6,6}$/ {exit 1}'
if [ $? = 0 ] ; then
echo 'six digits'
else
echo 'NOT six digits'
fi
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)
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)
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)
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)
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)
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)
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)
03-29-2002
