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Full Discussion: how to check to see if a file exists?
Top Forums Shell Programming and Scripting how to check to see if a file exists? Post 302575125 by astropi on Sunday 20th of November 2011 03:56:49 PM
Old 11-20-2011
how to check to see if a file exists?
I want to write a script to see if various files exist. What I want to do is have the script search in various directories if a file exist, and if not, then output something like "/path/file does not exist". I don't actually know of how to check and see if a file exists or not. What I have in mind is something like this:

Code:
cd /path/.../
if [file does NOT exists]
echo "/path/.../" >> bad.txt
fi

How would I check and see if a file exists? Thanks for any help!
 

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LEARN ABOUT MINIX

rename

RENAME(2)							System Calls Manual							 RENAME(2)

NAME

       rename - change the name of a file

SYNOPSIS

       #include <stdio.h>

       int rename(const char *from, const char *to)

DESCRIPTION

       Rename  causes the link named from to be renamed as to.	If to exists, then it is first removed.  Both from and to must be of the same type
       (that is, both directories or both non-directories), and must reside on the same file system.

       Rename guarantees that an instance of to will always exist, even if the system should crash in the middle of the operation.

       If the final component of from is a symbolic link, the symbolic link is renamed, not the file or directory to which it points.

RETURN VALUE

       A 0 value is returned if the operation succeeds, otherwise rename returns -1 and the global variable errno indicates  the  reason  for  the
       failure.

ERRORS

       Rename will fail and neither of the argument files will be affected if any of the following are true:

       [ENAMETOOLONG] A path name exceeds PATH_MAX characters.

       [ENOENT]       A component of the from path does not exist, or a path prefix of to does not exist.

       [EACCES]       A component of either path prefix denies search permission.

       [EACCES]       The requested link requires writing in a directory with a mode that denies write permission.

       [EPERM]	      The  directory  containing  from	is marked sticky, and neither the containing directory nor from are owned by the effective
		      user ID.

       [EPERM]	      The to file exists, the directory containing to is marked sticky, and neither the containing directory nor to are  owned	by
		      the effective user ID.

       [ELOOP]	      Too many symbolic links were encountered in translating either pathname.	(Minix-vmd)

       [ENOTDIR]      A component of either path prefix is not a directory.

       [ENOTDIR]      From is a directory, but to is not a directory.

       [EISDIR]       To is a directory, but from is not a directory.

       [EXDEV]	      The link named by to and the file named by from are on different logical devices (file systems).

       [ENOSPC]       The  directory  in which the entry for the new name is being placed cannot be extended because there is no space left on the
		      file system containing the directory.

       [EIO]	      An I/O error occurred while making or updating a directory entry.

       [EROFS]	      The requested link requires writing in a directory on a read-only file system.

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

       [EINVAL]       From is a parent directory of to, or an attempt is made to rename ``.'' or ``..''.

       [ENOTEMPTY]    To is a directory and is not empty.

SEE ALSO

       open(2)

4.2 Berkeley Distribution					   May 22, 1986 							 RENAME(2)
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