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Full Discussion: File is not empty?
Top Forums Shell Programming and Scripting File is not empty? Post 19142 by Jimbo on Saturday 6th of April 2002 09:53:04 AM
Old 04-06-2002
lesstjm is asking how to make sure a file is not zero bytes. I think he wants to test actual file content, in which case he will want the -s option. But since the sample code used a variable, that leaves the door open to the other interpretation of wanting to test content of the variable instead of the file it references.

So just to clarify, -s will test the file itself for content, and -z and -n will test the contents of the variable.
Jimbo
 

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ETSF_IO(1)							   User Commands							ETSF_IO(1)

NAME
etsf_io - manual page for etsf_io SYNOPSIS
etsf_io [-h | -a action] [[-i file]...] [[-f flag]...] DESCRIPTION
[-o file] [arguments] Handle ETSF files, see --action option. -h --help : show this little help. -a --action value : give the action to perform. Possible action may be: * 'merge' to gather several files that have been splitted. * 'content' to get the name of specifications the file matches. * 'check' to check the validity of the file against specifications. -o --output-file file : give the path to the output ETSF file. -i --input-file file : give the path for an input file. This option can be used one or several times. -l --list : when action is check, it give the list of available flags.q -f --flag value : give a flag name (get valid names from -l option). Examples: Merge three files, etsf_io -a merge -i file1.nc -i file2.nc -i file3.nc -o output.nc Get the contents of file test.nc, etsf_io -a content test.nc Get the list of flags for validity checks, etsf_io -a check -l Checks with two flags, etsf_io -a check -f flag1 -f flag2 test.nc SEE ALSO
The full documentation for etsf_io is maintained as a Texinfo manual. If the info and etsf_io programs are properly installed at your site, the command info etsf_io should give you access to the complete manual. etsf_io November 2011 ETSF_IO(1)
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