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Full Discussion: Script to check file exists
Top Forums Shell Programming and Scripting Script to check file exists Post 302550686 by cjcox on Friday 26th of August 2011 05:44:46 PM
Old 08-26-2011
Perhaps more difficult than it seems... if you want to be portable and without many issues. You see a wildcard is expanded by the shell.. this means that for sufficiently large matches, you'll blow up the command line (imagine *.txt matching thousands of files in the current directory and all of that fitting onto the command line).


So... it might be more portable to do an ls and filter for matches, quitting on first matched occurrence.

Code:
path=/abc/xyz/
files=`ls "${path}" | sed -n -e '/\.log$/ { p;q; }' -e '/\.txt$/ { p;q; }'`
if [ "$files" ]; then
  echo "Good"
else
  echo "Failure"
fi


Depending on shell and utilities available, there may be some less portable solutions for this. The one I show here should work just about anywhere there is a bourne shell compatible shell and some reasonable flavor of sed.
 

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line(1) 						      General Commands Manual							   line(1)

NAME
line - read one line from user input SYNOPSIS
timeout] DESCRIPTION
copies one line (up to a new-line) from the standard input and writes it on the standard output. It returns an exit code of 1 on EOF and always prints at least a new-line. It is often used within shell files to read from the user's terminal. Options recognizes the following command-line option: Timeout after timeout seconds where timeout is an integer value (if a non-integer value is specified, it is converted to an integer; i.e., rounded down). A blank is required between and the timeout argument. This option is not documented in POSIX and other industry standards, and should not be used in portable applications. EXTERNAL INFLUENCES
International Code Set Support Single- and multi-byte character code sets are supported. EXAMPLES
The following lines in a shell script prompt for a file name and display information about the file: To limit the response time to 10 seconds, use the form: then test for no response. If no response occurs before timeout expires, a default behavior should be provided. WARNINGS
This command is likely to be withdrawn from X/Open standards. Applications using this command might not be portable to other vendors' sys- tems. As an alternative is recommended. SEE ALSO
sh(1), read(2). STANDARDS CONFORMANCE
line(1)
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