On Sun, May 4, 2014 at 4:32 PM, ~Stack~ <[email protected]> wrote:
> Greetings, > > I know this isn't explicitly a Debian problem, but I have seen many > really smart Bash programmers on this list so I figured this was a good > place to ask. :-) > > $ bash --version > GNU bash, version 4.2.37(1)-release (x86_64-pc-linux-gnu > $ cat /etc/debian_version > 7.5 > > I have a Bash script I am working on where I am getting (supposedly) a > two-digit number from the user. I handle all the logic to ensure I am > getting two digits and not >2, letters, characters, ect in a different > function. By the time I get to this code in my script, I am assuming it > is a one or two digit number. Because I need a two digit number I am > assuming that my user may have just input a single digit for the first > nine numbers without a leading zero. I am doing this in my code like: > > verifiednum=`printf %02d $uservar` > > This works really well when they enter only a single digit or 01-07. > However, on 08 or 09, this fails. > > $ cat test.sh > #!/bin/bash - > printf %02d 07 #This Works. > echo "" > printf %02d 8 #This Works. > echo "" > printf %02d 08 #This doesn't. > echo "" > printf %02d 9 #This Works. > echo "" > printf %02d 09 #This doesn't. > echo "" > > $ ./test.sh > 07 > 08 > ./test.sh: line 6: printf: 08: invalid octal number > 00 > 09 > ./test.sh: line 10: printf: 09: invalid octal number > 00 > > I almost want to think that this is a bug, but because it seems to be > thinking it is an octal number (which technically it is I suppose :). I > am guessing that it just doesn't like what I am doing with printf but I > am a bit baffled as to why it only croaks on 08 and 09. > > 1) Does anyone know what is wrong here? > leading zero is interpreted as octal. You need to prepend the number with 10# to convert it to decimal first > > 2) Is there a better way of solving this issue? > > so try this instead printf %02d $(( 10#08 )) Thanks! > ~Stack~ > > -- Asif Iqbal PGP Key: 0xE62693C5 KeyServer: pgp.mit.edu A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing?
