Shell function recursive call implements a comparative copy of the directory

Purpose and Requirements:

When porting, you need to integrate the new content in the root filesystem rootfs1 into the ROOTFS2, but not the things rootfs2. That is, you can only compare the similarities and differences of two file systems, moving more than 2 out of 1 to 2.

Difficulties:

If you have the same subdirectory in the directory, make the subdirectories meet the above requirements.

The finishing touches:

Shell recursive invocation, referring to binary tree depth-first traversal.

Real:

1#!/bin/Bash2 3 Cpdifffile ()4 {5 6dir1=$17dir2=$28Files1= 'ls$DIR 1 '9#files2 = 'ls$DIR 2 'Ten      forFile1inch$files 1 One      Do A         ls$DIR 2/$file 1 >/dev/NULL 2>&1 -         if[$?-eq0 ] -          Then the             Echo$DIR 2 havefile$file 1 -         Else -             EchoWouldCP$DIR 1/$file 1 to $DIR 2 -             CP-a $DIR 1/$file 1 $DIR 2/ +         fi -      Done + } A  at Cpsamedir () - { -Cpdifffile $1$2 -Subdirs1= 'ls-L $1|grep "^d"|awk-f\'{print $9}'` -Subdirs2= 'ls-L $2|grep "^d"|awk-f\'{print $9}'` - unset samedirs # #注意, here to empty the array, otherwise the result of the last call is saved here will form a ring, a dead loop inI=0 -      forSubDir1inch$subdirs 1 to      Do +         ls$2/$subdir 1 >/dev/NULL 2>&1 -         if[$?-eq0 ] the          Then *samedirs[i]=$subdir 1 $Let i++Panax Notoginseng  -         Else the             Echo$1Havedir$subdir 1, but $2Not . +         fi A      Done the     Echo "Bettenw $ and $, the same dir is:" +     Echo${samedirs[@]} -  $      forSamedirinch${samedirs[@]} $      Do -         Echo "Now oparate $1/$samedir and $2/$samedir" -Cpsamedir $1/$samedir $2/$samedir the      Done - Wuyi  the  - } Wu  - Main () About { $Cpsamedir $1$2 -  - } -  AMain $1$2

Shell function recursive call implements a comparative copy of the directory