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Top Forums UNIX for Dummies Questions & Answers Operating on a file being written by another application Post 61266 by GMMike on Tuesday 1st of February 2005 02:42:28 PM
Old 02-01-2005
Operating on a file being written by another application

Hi,
I have a directory that is used to store files generated by another application. Each file is huge and can take some time to produce.
I am writing a shell script to check the names and dates of the files and do some functions on the ones that are not being written out.

My question is, if I use a command like cat for example on a file that is being written by another application (while it is being written) will I get an error or will the cat just retunr a zero return code?

For example, if the application was generating file called f1, and I do this:
cat f1>f2
what would be the return code?

I am using Sun/Solaris and I find this kind of hard to test.

Thanks in advance.
Smilie
 

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BZEXE(1)						      General Commands Manual							  BZEXE(1)

NAME
bzexe - compress executable files in place SYNOPSIS
bzexe [ name ... ] DESCRIPTION
The bzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a penalty in performance). For example if you execute ``bzexe /bin/cat'' it will create the following two files: -r-xr-xr-x 1 root bin 9644 Feb 11 11:16 /bin/cat -r-xr-xr-x 1 bin bin 24576 Nov 23 13:21 /bin/cat~ /bin/cat~ is the original file and /bin/cat is the self-uncompressing executable file. You can remove /bin/cat~ once you are sure that /bin/cat works properly. This utility is most useful on systems with very small disks. OPTIONS
-d Decompress the given executables instead of compressing them. SEE ALSO
bzip2(1), znew(1), zmore(1), zcmp(1), zforce(1) CAVEATS
The compressed executable is a shell script. This may create some security holes. In particular, the compressed executable relies on the PATH environment variable to find gzip and some other utilities (tail, chmod, ln, sleep). BUGS
bzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually in some cases, using chmod or chown. BZEXE(1)
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