What is the '+' in find command for? [duplicate]

Question

I have some times come across the use of trailing + while using unix commands like find.

Example from SO post -

find -exec touch -t 201007162310.00 \+

Please help me understand the use of this.

Answer 1

From man find:

-exec command {} +

This variant of the -exec action runs the specified command on the
selected files, but the command line  is  built  by appending  each
selected  file name at the end; the total number of invocations of the
command will be much less than the number of matched files.  The command
line is built in much the same way that  xargs  builds  its  command
lines.  Only one instance of `{}' is allowed within the command.  The
command is executed in the starting directory.

For example with find -exec touch -t 201007162310.00 \+, if the find command without the -exec gives you the files 1.txt, 2.txt and 3.txt, it will exec:

touch -t 201007162310.00 1.txt
touch -t 201007162310.00 2.txt
touch -t 201007162310.00 3.txt

without the \+, and

touch -t 201007162310.00 1.txt 2.txt 3.txt

with the \+.

The latter version is faster due to a (much) smaller number of new processes needed yet it is less portable (not all find implementations support it). And of course, if the command you try to -exec doesn't support receiving multiple files as arguments, it won't work.