in bash script, I define a array:
array=$(awk '{print $4}' /var/log/httpd/sample | uniq -c | cut -d[ -f1)
Now, I want to translate this content to code in bash script:
"if there is NOT any element in array, it means array=nothing, then echo "nothing in array".
help me to do that??? Thanks a lot
*besides, I want to delete access_log's content periodically every 5min (/var/log/httpd/access_log). Please tell me how to do that??*
Saying:
array=$(awk '{print $4}' /var/log/httpd/sample | uniq -c | cut -d[ -f1)
does not define an array. This simply puts the result of the command into the variable array.
If you wanted to define an array, you'd say:
array=( $(awk '{print $4}' /var/log/httpd/sample | uniq -c | cut -d[ -f1) )
You can get the count of the elements in the array by saying echo "${#foo[@]}".
For checking whether the array contains an element or not, you can say:
(( "${#array[@]}" )) || echo "Nothing in array"
