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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 SUSE

dirname

DIRNAME(1)							   User Commands							DIRNAME(1)

NAME

       dirname - strip non-directory suffix from file name

SYNOPSIS

       dirname NAME
       dirname OPTION

DESCRIPTION

       Print NAME with its trailing /component removed; if NAME contains no /'s, output `.' (meaning the current directory).

       --help display this help and exit

       --version
	      output version information and exit

EXAMPLES

       dirname /usr/bin/sort
	      Output "/usr/bin".

       dirname stdio.h
	      Output ".".

AUTHOR

       Written by David MacKenzie and Jim Meyering.

REPORTING BUGS

       Report dirname bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>

COPYRIGHT

       Copyright (C) 2009 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       basename(1), readlink(1)

       The  full  documentation  for  dirname  is maintained as a Texinfo manual.  If the info and dirname programs are properly installed at your
       site, the command

	      info coreutils 'dirname invocation'

       should give you access to the complete manual.

GNU coreutils 7.1						     July 2010								DIRNAME(1)
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