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Linux bash script to change argument to lowercase

Posted on 2011-03-07
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Last Modified: 2012-06-27
I have the following script which works great if the user types both arguments in all lower case.  If the user of the script types the command with any upper case letters the script will fail.  I am sure there must be a way for the user input to be proceed in all lower case.

The 2 arguments in my script are: ${CONTEXT} and  ${MACADD}

Thanks


#!/bin/bash
#
if [ -z ${2} ]
then
    echo "usage: $0 <contextname> <macaddress>"
    exit 1
fi
CONTEXT=${1}
MACADD=${2}
cat /var/softswitch/configs/device/polycom/${CONTEXT}/${MACADD}-boot.log

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Question by:ipconfig610
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3 Comments
 
LVL 2

Expert Comment

by:P-Y
ID: 35059669
Try this:

#!/bin/bash
#
if [ -z ${2} ]
then
    echo "usage: $0 <contextname> <macaddress>"
    exit 1
fi
CONTEXT=${1} | tr '[A-Z]' '[a-z]'
MACADD=${2} | tr '[A-Z]' '[a-z]'
cat /var/softswitch/configs/device/polycom/${CONTEXT}/${MACADD}-boot.log
0
 
LVL 31

Accepted Solution

by:
farzanj earned 500 total points
ID: 35059689
CONTEXT=$(echo ${1} | tr [[:upper:]] [[:lower:]])
MACADD=$(echo ${2} | tr [[:upper:]] [[:lower:]])
0
 
LVL 31

Expert Comment

by:farzanj
ID: 35059710
Newer versions of bash also let you do this at the top of the script.  This should fix any problems you are having.

declare -l CONTEXT MACADD

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Older versions don't understand it.
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