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Full Discussion: check for "cannot open file"
Top Forums UNIX for Dummies Questions & Answers check for "cannot open file" Post 302108435 by sb008 on Monday 26th of February 2007 01:36:07 PM
Old 02-26-2007
Quote:
Originally Posted by ssmith001
I have a small script that checks to see if a file exists and that it has data in it. I also need to check if the file can be opened. I had an issue today where the file it checks could not be opened and my script did not catch it. How do I check to see if it cannot be opened?

Code:
dirname=/opt/manu/srv
f1=manumgrmdip2_7500.log
f2=manumgrmdip2_7500.pid
export HOST=`hostname`
f1size=`wc -c $dirname/manumgrmdip2_7500.log | cut -f1 -d " "`
f2size=`wc -c $dirname/manumgrmdip2_7500.pid | cut -f1 -d " "`

if [[ ! -f $dirname/$f1 || ! -f $dirname/$f2 ]] ; then
      echo "Either <$dirname/$f1> or <$dirname/$f1> does not exist" | mailx -s "Missing files on Manugistics $HOST Server (MDIP2)" user@xyz.com
else if (( $(wc -c < $dirname/$f1) != 0 )) || (( $(wc -c < $dirname/$f2) > 6 )) ; then
      echo "The size of $dirname/$f1 size = $f1size, and $dirname/$f2 = $f2size'" | mailx -s "Error with file sizes on Manugistics $HOST Server (MDIP2)" user@xyz.com < manumgrmdip2_7500.log
     fi;
fi;


-r <filename> to check for existance and readability
-s <filename> to check for existance and size greater than 0

Code:
#!/usr/bin/ksh
dirname=/opt/manu/srv
f1=manumgrmdip2_7500.log
f2=manumgrmdip2_7500.pid
export HOST=`hostname`

if [ ! -r ${dirname}/${f1} -o ! -r ${dirname}/${f2} ]
then
  echo "Either <$dirname/$f1> or <$dirname/$f1> does not exist or is not readable" | mailx -s "Missing files on Manugistics $HOST Server (MDIP2)" user@xyz.com
elif [ ! -s ${dirname}/${f1} -o ! -s ${dirname}/${f2} ]
then
  echo "Either <$dirname/$f1> or <$dirname/$f2>has a filesize of 0'" | mailx -s "Error with file sizes on Manugistics $HOST Server (MDIP2)" user@xyz.com < manumgrmdip2_7500.log
fi

if you want to know the exact size use the typeset command so you don't need the cut command:

Code:
typset -i f1size f2size
f1size=`wc -c ${dirname}/${f1}`
f2size=`wc -c ${dirname}/${f2}`

 

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LEARN ABOUT ULTRIX

chroot

chroot(2)							System Calls Manual							 chroot(2)

Name
       chroot - change root directory

Syntax
       chroot(dirname)
       char *dirname;

Description
       The  dirname is the address of the pathname of a directory, terminated by a null byte.  The system call causes this directory to become the
       root directory (/).

       For a directory to become the root directory, a process must have execute (search) access to the directory.

       This call is restricted to the superuser.

Return Values
       Upon successful completion, a value of 0 is returned.  Otherwise, a value of -1 is returned and errno is set to indicate an error.

Diagnostics
       The system call fails and the root directory is unchanged under the following conditions:

       [ENOTDIR]      A component of the dirname is not a directory.

       [ENAMETOOLONG] A component of a dirname exceeded 255 characters, or an entire dirname exceeded 1023 characters.

       [ENOENT]       The dirname argument points to the name of a directory which does not exist, or to  an  empty  string  and  the  environment
		      defined is POSIX or SYSTEM_FIVE.

       [EFAULT]       The dirname points outside the process's allocated address space.

       [ELOOP]	      Too many symbolic links were encountered in translating the pathname.

       [EIO]	      An I/O error occurred while reading from or writing to the file system.

       [ESTALE]       The  file  handle  given	in the argument is invalid.  The file referred to by that file handle no longer exists or has been
		      revoked.

       [ETIMEDOUT]    A connect request or remote file operation failed because the connected party did not properly respond  after  a	period	of
		      time that is dependent on the communications protocol.

       [EPERM]	      The effective user ID is not that of superuser.

See Also
       chdir(2)

																	 chroot(2)
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