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
The purpose of those comands are to find the newest file in a directory acvrdind to system date, and it has to be recursively found in each directory.
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Discussion started by: greavette
3 Replies
LEARN ABOUT PHP
apc_add
APC_ADD(3) 1 APC_ADD(3)apc_add - Cache a new variable in the data storeSYNOPSIS
bool apc_add (string $key, mixed $var, [int $ttl])
DESCRIPTION
array apc_add (array $values, [mixed $unused = NULL], [int $ttl])
Caches a variable in the data store, only if it's not already stored.
Note
Unlike many other mechanisms in PHP, variables stored using apc_add(3) will persist between requests (until the value is removed
from the cache).
PARAMETERS
o $key
- Store the variable using this name. $keys are cache-unique, so attempting to use apc_add(3) to store data with a key that
already exists will not overwrite the existing data, and will instead return FALSE. (This is the only difference between
apc_add(3) and apc_store(3).)
o $var
- The variable to store
o $ttl
- Time To Live; store $var in the cache for $ttl seconds. After the $ttl has passed, the stored variable will be expunged from the
cache (on the next request). If no $ttl is supplied (or if the $ttl is 0), the value will persist until it is removed from the
cache manually, or otherwise fails to exist in the cache (clear, restart, etc.).
o $values
- Names in key, variables in value.
RETURN VALUES
Returns TRUE if something has effectively been added into the cache, FALSE otherwise. Second syntax returns array with error keys.
EXAMPLES
Example #1
A apc_add(3) example
<?php
$bar = 'BAR';
apc_add('foo', $bar);
var_dump(apc_fetch('foo'));
echo "
";
$bar = 'NEVER GETS SET';
apc_add('foo', $bar);
var_dump(apc_fetch('foo'));
echo "
";
?>
The above example will output:
string(3) "BAR"
string(3) "BAR"
SEE ALSO apc_store(3), apc_fetch(3), apc_delete(3).
PHP Documentation Group APC_ADD(3)