Assistance with my Find command to identify last part of a file name and report the name found


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Top Forums Shell Programming and Scripting Assistance with my Find command to identify last part of a file name and report the name found
# 8  
You can put semicolons instead of newlines.
And vice versa; there is hardly a need for a one-liner.
Example string:
Code:
echo 'two
lines'

Example shell code:
Code:
result=$(
if [ -f /var/chef/cache/cookbooks/bootstrap_cookbooks_version_green ]
then echo "green"
elif [ -f /var/chef/cache/cookbooks/bootstrap_cookbooks_version_red ]
then echo "red"
else echo "does not exist"
fi
)

# 9  
Thank you apmcd47 for your helpful reply. I've managed to get the following code working to identify what I need:

Code:
[ -f /var/chef/cache/cookbooks/bootstrap_cookbooks_version_* ] && echo /var/chef/cache/cookbooks/bootstrap_cookbooks_version_* | sed 's/.*version_//'

But what could I add to this code to report that no file was found if a bootstrap_cookbooks_version_* file does not exist?

Thank you.
# 10  
Quote:
Originally Posted by greavette
Thank you apmcd47 for your helpful reply. I've managed to get the following code working to identify what I need:

Code:
[ -f /var/chef/cache/cookbooks/bootstrap_cookbooks_version_* ] && echo /var/chef/cache/cookbooks/bootstrap_cookbooks_version_* | sed 's/.*version_//'

But what could I add to this code to report that no file was found if a bootstrap_cookbooks_version_* file does not exist?

Thank you.
If you use my second example you could just add a second echo thus:
Code:
f=$(echo/var/chef/cache/cookbooks/bootstrap_cookbooks_version_*) && [ -f "$f" ] && echo ${f##*_} || echo "file does not exist"

In this case the string file does not exist is printed instead of the word red or green. Alternatively look into turning that echo into the instruction you actually want:
Code:
f=$(echo/var/chef/cache/cookbooks/bootstrap_cookbooks_version_*) && [ -f "$f" ] && cat > my_file_is_${f##*_}.txt <<EOT
this will go into the file my_file_is_red.txt
or the file my_file_is_green.txt
only if the file bootstrap_cookbooks_version_red 
(or ..._green) exist!
EOT

Andrew
# 11  
This:

Quote:
Originally Posted by greavette
Code:
[ -f /var/chef/cache/cookbooks/bootstrap_cookbooks_version_* ]


Is often seen but still wrong and it won't work as expected. A file glob returns a list of files (or the glob itself if no file of that pattern exists).You can't use it as input to a test -f.
# 12  
Yes, test -f on wildcards is too risky.
A loop is more robust:
Code:
for f in green red; do [ -f "/var/chef/cache/cookbooks/bootstrap_cookbooks_version_$f" ] && echo "$f" && break; done || echo "file does not exist"

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