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Full Discussion: check for "cannot open file"
Top Forums UNIX for Dummies Questions & Answers check for "cannot open file" Post 302108431 by ssmith001 on Monday 26th of February 2007 12:29:32 PM
Old 02-26-2007
check for "cannot open file"

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;

 

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DIRNAME(3)						   BSD Library Functions Manual 						DIRNAME(3)

NAME
dirname -- extract the directory part of a pathname SYNOPSIS
#include <libgen.h> char * dirname(char *path); char * dirname_r(const char *path, char *dname); DESCRIPTION
The dirname() function is the converse of basename(3); it returns a pointer to the parent directory of the pathname pointed to by path. Any trailing '/' characters are not counted as part of the directory name. If path is a null pointer, the empty string, or contains no '/' char- acters, dirname() returns a pointer to the string ".", signifying the current directory. IMPLEMENTATION NOTES
The dirname() function returns a pointer to internal storage space allocated on the first call that will be overwritten by subsequent calls. dirname_r() is therefore preferred for threaded applications. Other vendor implementations of dirname() may modify the contents of the string passed to dirname(); if portability is desired, this should be taken into account when writing code which calls this function. LEGACY SYNOPSIS
#include <libgen.h> char * dirname(const char *path); In legacy mode, path will not be changed. RETURN VALUES
On successful completion, dirname() returns a pointer to the parent directory of path. If dirname() fails, a null pointer is returned and the global variable errno is set to indicate the error. ERRORS
The following error codes may be set in errno: [ENAMETOOLONG] The path component to be returned was larger than MAXPATHLEN. [ENOMEM] The static buffer used for storing the path in dirname() could not be allocated. SEE ALSO
basename(1), dirname(1), basename(3), compat(5) STANDARDS
The dirname() function conforms to X/Open Portability Guide Issue 4, Version 2 (``XPG4.2''). HISTORY
The dirname() function first appeared in OpenBSD 2.2 and FreeBSD 4.2. The dirname_r() function first appeared in OS X 10.12. AUTHORS
Todd C. Miller BSD
October 12, 2006 BSD
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