'First character of a variable in a shell script to uppercase?

I have a shell script that starts unit tests for modules. I need the name of the module in all lowercase and with the first character uppercase. So far I have been doing it like this:

#!/bin/sh -x                                                                                                                                                                          
# z.B. getbrowser                                                                                                                                                                     
strModuleToTest=$1

# g                                                                                                                                                                                   
strModuleToTestUppercaseFirstletter=${strModuleToTest:0:1}
# etbrowser                                                                                                                                                                           
strModuleToTestUppercaseLastletters=${strModuleToTest:1}

# g -> G                                                                                                                                                                              
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/a/A}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/b/B}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/c/C}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/d/D}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/e/E}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/f/F}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/g/G}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/h/H}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/i/I}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/j/J}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/k/K}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/l/L}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/m/M}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/n/N}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/o/O}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/p/P}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/q/Q}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/r/R}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/s/S}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/t/T}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/u/U}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/v/V}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/w/W}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/x/X}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/y/Y}"
strModuleToTestUppercaseFirstletter="${strModuleToTestUppercaseFirstletter/z/Z}"

# Getbrowser
strModuleToTestUppercase=$strModuleToTestUppercaseFirstletter""$strModuleToTestUppercaseLastletters

What would be an easier way to set $strModuleToTestUppercase? I tried 

strModuleToTestUppercase="${strModuleToTest[@]^}"

or

strModuleToTestUppercasesed="sed 's/\<./\u&/g' $strModuleToTest"

but without success.

shellunixsedawk


Solution 1:[1]

You could use

strModuleToTestUpper=`sed 's/\(.\)/\U\1/' <<< "$strModuleToTest"`

Explanation

  • \(.\) matches a single character
  • \U\1 replaces that character with an uppercase version
  • no /g means only the first match is processed.

Solution 2:[2]

Is perl ok?

$ x=foobar
$ x=$(echo "$x" | perl -pe 's/^(.)/uc($1)/e')
$ echo $x
Foobar

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 beny23
Solution 2 Jens

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