Hi, I have a small script which uses egrep and a set of regexes to validate an IP address, however, i want to make it so that if somebody puts a leading space in front of the IP address to be validated it will fail, so this is my script
notice the space before the IP that I have set in $IP variable (in bold above)
this returns
its the same however many spaces i put in front of the IP, however, if i put a different character in front of the IP e.g
it fails as expected
its just those pesky spaces .. as you can see I have entered a ^ in the regex at the beginning but that seems to be ignored
No, it's not ignored. In fact, any spaces you put before the IP address are stripped away with the echo in
, most probably even sooner, with the call to ip_checker
Put double quotes around the $1/$IP and your script will fail as expected.
Just as a side node: most UNIX shells (all that I know) use spaces as argument seperators and strip away any that aren't explicitly literal (using quotes). There's usually no need to check for them manually.
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