On Sat, Nov 6, 2010 at 6:12 AM, <h...@hgbhome.net> wrote: > Configuration Information [Automatically generated, do not change]: > Machine: i486 > OS: linux-gnu > Compiler: gcc > Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i486' > -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i486-pc-linux-gnu' > -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL > -DHAVE_CONFIG_H -I. -I../bash -I../bash/include -I../bash/lib -g -O2 > -Wall > uname output: Linux main.hgbhome.net 2.6.18-4-686 #1 SMP Wed May 9 23:03:12 > UTC 2007 i686 GNU/Linux > Machine Type: i486-pc-linux-gnu > > Bash Version: 3.2 > Patch Level: 39 > Release Status: release > > Description: > > Hi, > > if a program ist started with $($prog) the output is different from <command> > or even $(<command>). Example with find (excluding a directory from search): > > $ ls -l /test > total 16 > drwxrwxr-x 2 hgb hgb 4096 Nov 6 02:14 a > drwxrwxr-x 2 hgb hgb 4096 Nov 6 02:14 b > drwxrwxr-x 2 hgb hgb 4096 Nov 6 02:14 c > drwxrwxr-x 2 hgb hgb 4096 Nov 6 02:14 d > $ find /test -type d ! -wholename "/test" > /test/c > /test/b > /test/d > /test/a > $ echo "$(find /test -type d ! -wholename "/test")" > /test/c > /test/b > /test/d > /test/a > $ prog='find /test -type d ! -wholename "/test"' > $ echo $prog > find /test -type d ! -wholename "/test" > $ echo "$($prog)" > /test > /test/c > /test/b > /test/d > /test/a > $ > > As seen above /test ist shown when $prog is executed. > > I see the same behavior with > GNU bash, version 3.2.25(1)-release (x86_64-redhat-linux-gnu) (CentOS) > GNU bash, version 3.2.39(1)-release (i486-pc-linux-gnu) (debian) > > > I understand that the above looks crazy and not like a problem out of real > life > .... I had to use find to crawl through a huge tree and remove only a few > files > in it. I came across the above problem when feeding an array with the output > of > find; I fixed it for now by removing the unwanted entries from the output > array. > > Thanks in advance for looking into this. > > Regards > -- hgb > > > > your problem is there:
$ prog='find /test -type d ! -wholename "/test"' The quotes around " " are quoted, they are not special to the shell anymore, only the literal, non quoted quotes are special to the shell. When you later execute $prog, the " " are not removed, they are no more special than the other literal chars. check this http://mywiki.wooledge.org/BashFAQ/050
