[SOLVED] Upper and lower case in shell

kofucii · 12-12-2009, 07:44 AM

Hello, I wish to convert first charactr of a string to Upper case, adn the rest to lower case. The case of string may vary like this:

FOobAr
fooBAR
fOObaR

but the output shold be:

Foobar

I guess it can be done with "tr", but how exacly?

catkin · 12-12-2009, 08:04 AM

Code:

s='fOobAr'
s="$(echo ${s:0:1} | tr '[:lower:]' '[:upper:]')$(echo ${s:1} | tr '[:upper:]' '[:lower:]')"
echo "DEBUG: s is '$s'"

ghostdog74 · 12-12-2009, 08:24 AM

if you have bash 4.0, no need external tools.

Code:

$ string="FOobAr"
$ s=${string,,} #convert all to lower case
$ echo ${s^} # convert first char to uppercase
Foobar