check file exist before execution


 
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# 8  
Old 04-25-2012
Quote:
Originally Posted by guddu_12
Hi Robin

How to use error code and message generated by ls, can you please give me an example

Did you try my code with [ -e "$file" ] || exit 0 yet? I do believe this is a much better approach. There are pitfalls to parsing ls. ls produces a list for humans to read. The shell can already produce a working set of files with globbing. For example, files with spaces, and even directories:

Code:
$ touch 'file with spaces.log'
$ mkdir 'directory.log'; touch 'directory.log/file1' 'directory.log/file2'
$ for file in *.log; do echo "$file"; done
directory.log
file with spaces.log
$ for file in `ls -1 *.log`; do echo "$file"; done
file
with
spaces.log
directory.log:
file1
file2

You see that ls is not good for parsing. It's likely you can be certain your directory will not have files with spaces, nor directories with .LOG ending, but it's good practice. So I suggest simply adding a test inside the loop. This should do as well:

Code:
for log in *.LOG
do
    [ -f "$log" ] || continue
    load
    move
done


Last edited by neutronscott; 04-25-2012 at 11:12 AM.. Reason: code indentation
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