Replacing stripped off leading zeros in shell script


 
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# 1  
Old 11-12-2009
Replacing stripped off leading zeros in shell script

I have a script which is taking a 10 character variable (BOC) input by the user. If it begins with a zero, the script unwittingly strips that off, & passes a 9 characters variable.

Code:
echo -n "Enter core-follow date/time for BOC: "
    setenv BOC $<

The next bit of code picks up the 9 character variable and runs with that. I want to be able to add a leading zero if the character is a 9 char variable, otherwise if its 10 characters, don't do anything.

At the minute I'm having to add in a leading zero as below, but this will screw up variables which don't start with a zero.

Code:
RETRIEVE FROM FILE "$PAN_MODEL_DIR./data/R$REACTOR..LOADING.0$BOC."

# 2  
Old 11-12-2009
one way:

Code:
#  echo 123456789 | awk 'length<10{t="0"}{print t""$0}'
0123456789


#  echo 1234567890 | awk 'length<10{t="0"}{print t""$0}'
1234567890

HTH
# 3  
Old 11-12-2009
Code:
printf "%010.f\n" $BOC

# 4  
Old 11-13-2009
Is there a way to pipe this to a variable, instead of the screen?
# 5  
Old 11-13-2009
I don't know what shell you are using but wouldn't it be easier to just use: -

Code:
read BOC

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