Shell Programming and Scripting

#!/usr/bin/env bash
find ... | while IFS= read -r file; do
   upper=$(nawk ... <<< "$file")
   echo mv "$file" "$upper"
done

#!/usr/bin/env bash
find /path/to/search/dir -name '*.txt'| while IFS= read -r file; do
   upper=$(nawk -F"/" -v OFS="/" '{$NF=toupper($NF)} 1' <<< "$file")
   echo mv "$file" "$upper"
done

for i in $(find /path/to/search/dir -name '*.txt'); do
     mv "${i}" "${i^^}"
done

find ... | while read LINE
do
...
done

find /path/to/dir -name "*.txt" -print | sed -e 's/^/"/' -e 's/$/"/' |  nawk -F/ '{orig=$0; $NF=toupper($NF); print "mv " orig " " $0}'  OFS=/

find /path/to/dir -name "*.txt" -print | sed -e 's/^/"/' -e 's/$/"/' |  nawk -F/ '{orig=$0; $NF=toupper($NF); print "mv " orig " " $0}' OFS=/ | sh