Accessing redirected file inside script


 
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# 1  
Accessing redirected file inside script

hi,

Is there a way to access the redirected file inside the script. Here is what the command line looks like:

Code:
$ shar * > archive_file.arc

I know I can't access the name of archive_file.arc with positional parameters like $1, $2.. Is there any way to figure out what file the output of the present script is being redirected?

Thanks
# 2  
On Solaris sytems you can:

The script:
-------------------------
#!/usr/bin/ksh

pfiles $$
-------------------------


The command line:
-------------------------
./test.sh > out 2> out2
-------------------------

The output (in the file "out")
-------------------------
$ cat out
19888: /usr/bin/ksh ./test.sh
Current rlimit: 256 file descriptors
0: S_IFCHR mode:0620 dev:283,0 ino:12582918 uid:107 gid:7 rdev:24,1
O_RDWR|O_NOCTTY|O_LARGEFILE
/devices/pseudo/pts@0:1
1: S_IFREG mode:0640 dev:85,60 ino:2023 uid:107 gid:150 size:0
O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE
/export/home/XXXXX/out
2: S_IFREG mode:0640 dev:85,60 ino:2027 uid:107 gid:150 size:0
O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE
/export/home/XXXXX/out2
62: S_IFREG mode:0750 dev:85,60 ino:456 uid:107 gid:150 size:26
O_RDONLY|O_LARGEFILE FD_CLOEXEC
/export/home/XXXXX/test.sh
-------------------------

The Output shows the file descriptors
1 for stdout (redirected to file "out")
1: S_IFREG .............
The last line shows the file whereto stdout has been redirected to.
/export/home/XXXXX/out
2: for stderr (redirected to the file "out2")
2: S_IFREG .............
Again, the last line shows the file whereto stderr has been redirected to.
/export/home/XXXXX/out2
# 3  
thanks a lot, but the file that is being redirected isn't recorded in my output file. The system I am using is SunOS 5.8. I tried it on Linux too, but linux didn't recognize the pfiles command at all. Here's my output when I run the 2 lines script on SunOS 5.8:
Code:
server:bash:/var/tmp > ./redirect.sh > out.dump
server:bash:/var/tmp > cat out.dump
4883:   /usr/bin/ksh ./redirect.sh
  Current rlimit: 256 file descriptors
   0: S_IFCHR mode:0600 dev:224,0 ino:132378 uid:4405 gid:7 rdev:24,4
      O_RDWR|O_LARGEFILE
   1: S_IFREG mode:0600 dev:224,5 ino:156220 uid:4405 gid:206 size:0
      O_WRONLY|O_LARGEFILE
   2: S_IFCHR mode:0600 dev:224,0 ino:132378 uid:4405 gid:7 rdev:24,4
      O_RDWR|O_LARGEFILE
  62: S_IFREG mode:0700 dev:224,5 ino:156219 uid:4405 gid:206 size:26
      O_RDONLY|O_LARGEFILE FD_CLOEXEC

server:bash:/var/tmp > cat ./redirect.sh
#!/usr/bin/ksh

pfiles $$

isn't there another way?
# 4  
Quote:
Originally Posted by milhan
thanks a lot, but the file that is being redirected isn't recorded in my output file. The system I am using is SunOS 5.8. I tried it on Linux too, but linux didn't recognize the pfiles command at all. Here's my output when I run the 2 lines script on SunOS 5.8:
Code:
server:bash:/var/tmp > ./redirect.sh > out.dump
server:bash:/var/tmp > cat out.dump
4883:   /usr/bin/ksh ./redirect.sh
  Current rlimit: 256 file descriptors
   0: S_IFCHR mode:0600 dev:224,0 ino:132378 uid:4405 gid:7 rdev:24,4
      O_RDWR|O_LARGEFILE
   1: S_IFREG mode:0600 dev:224,5 ino:156220 uid:4405 gid:206 size:0
      O_WRONLY|O_LARGEFILE
   2: S_IFCHR mode:0600 dev:224,0 ino:132378 uid:4405 gid:7 rdev:24,4
      O_RDWR|O_LARGEFILE
  62: S_IFREG mode:0700 dev:224,5 ino:156219 uid:4405 gid:206 size:26
      O_RDONLY|O_LARGEFILE FD_CLOEXEC

server:bash:/var/tmp > cat ./redirect.sh
#!/usr/bin/ksh

pfiles $$

isn't there another way?

On Solaris 8 the output of pfiles is a bit limited. But still it can be done

You redirected stdout, so FD 1 (File Descriotor 1)

1: S_IFREG mode:0600 dev:224,5 ino:156220 uid:4405 gid:206 size:0
O_WRONLY|O_LARGEFILE

The line shows that FD 1 is related to inode number 156220 which happens to be the inode number for "out.dump"

If you know the exact location (directory) of the file you reirect to you can find out, based on the combination of the output of the commands "pfiles" and "ls -i <dir>", what the name is of the file where your output is directed to.

If you don't know the exact location but at least the the filesystem where to file is located, you can use:
find <root of filesystem> -inum <inode numver as reported by pfiles>

If you have no clue at all wherre the file is located you could use:
find / -inum <inode numver as reported by pfiles>

However in this last scenario more then 1 file could pop up, because on each filesystem there could be a file present with that inode number
 

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