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How to convert a string to upper or lower case in bash?

« H E email
posted Monday, 2 October 2006
Assuming tr is available on the system,

Convert the given argument into an all lower case string. 

toLower() {
  echo $1 | tr "[:upper:]" "[:lower:]" 
}

Convert the given argument into an all lower case string. 

toUpper() {
  echo $1 | tr "[:lower:]" "[:upper:]" 
}

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comments (8)


1. WhyNot left...
Monday, 10 August 2009 1:40 pm

You could just use the internal routines....

example.sh:

#!/bin/bash echo ${1^} echo ${1} echo ${1,} echo ${1,,}

Then try 'example.sh AbCdEf' to get:

AbCdEf ABCDEF abCdEf abcdef


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