Can I use awk to convert all the lower-case letters into upper-case?

Question

I have a file mixed with lower-case letters and upper-case letters, can I use awk to convert all the letters in that file into upper-case?

Answer 1

If Perl is an option:

perl -ne 'print uc()' file

• -n loop around input file, do not automatically print line
  
• -e execute the perl code in quotes
  
• uc() = uppercase

To print all lowercase:

perl -ne 'print lc()' file

Answer 2

Try this:

$ echo mix23xsS | awk '{ print toupper($0) }'
MIX23XSS

Answer 3

Something like

< yourMIXEDCASEfile.txt awk '{print toupper($0)}' > yourUPPERCASEfile.txt

Answer 4

You can use awk, but tr is the better tool:

tr a-z A-Z < input

or

tr [:lower:] [:upper:] < input

Answer 5

You mean like this thread explains: http://www.unix.com/shell-programming-scripting/24320-converting-file-names-upper-case.html (Ok, it's about filenames, but the same principle applies to files)

Answer 6

Try this:

awk '{ print toupper($0) }' <<< "your string"

Using a file:

awk '{ print toupper($0) }' yourfile.txt