sed в двойном echo

"${VAR//STRING1/STRING2}"

find ... -exec prename 's/STRING1/STRING2/g' {} +

xargs -I VAR echo svn mv "VAR" $(echo VAR|sed 's/STRING1/STRING2/g')

xargs -I VAR echo svn mv "VAR" "${VAR//STRING1/STRING2}"

       ${parameter/pattern/string}
              Pattern  substitution.  The pattern is expanded to produce a pattern just as in pathname expansion.  Parameter is
              expanded and the longest match of pattern against its value is replaced with string.  If pattern begins  with  /,
              all  matches  of pattern are replaced with string.  Normally only the first match is replaced.  If pattern begins
              with #, it must match at the beginning of the expanded value of parameter.  If pattern begins  with  %,  it  must
              match at the end of the expanded value of parameter.  If string is null, matches of pattern are deleted and the /
              following pattern may be omitted.  If parameter is @ or *, the substitution operation is applied  to  each  posi‐
              tional parameter in turn, and the expansion is the resultant list.  If parameter is an array variable subscripted
              with @ or *, the substitution operation is applied to each member of the array in turn, and the expansion is  the
              resultant list.

svn mv .....

find … sed -r 'h; s/STRING1/STRIG2/g; G; s/(.*)\n(.*)/svn mv "\2" "\1"/p'

export IFS=$(echo -en "\n\b");for i in `find trunk -type d -name '*DIR1*'`; do echo "svn mv $i `echo $i|sed "s/STRING1/STRING2/g"`"; done; unset IFS