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How to check if a file contains a specific string using Bash
I want to check if a file contains a specific string or not in bash. I used this script, but it doesn't work:
11 Answers
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Is it possible to roll back CREATE TABLE and ALTER TABLE statements in major SQL databases?
...saction finishes. Also, not all situations are quite handled- for example, if you try to select from table foo while another transaction is dropping it and creating a replacement table foo, then the blocked transaction will finally receive an error rather than finding the new foo table. (Edit: this ...
Staging Deleted files
...the index to match the current state of the directory as a whole (e.g. specifying dir will record not just a file dir/file1 modified in the working tree, a file dir/file2 added to the working tree, but also a file dir/file3 removed from the working tree. Note that older versions of Git used to ignor...
Get top n records for each group of grouped results
...s, using UNION ALL (See SQL Fiddle with Demo). This works with two groups, if you have more than two groups, then you would need to specify the group number and add queries for each group:
(
select *
from mytable
where `group` = 1
order by age desc
LIMIT 2
)
UNION ALL
(
select *
from...
Are empty HTML5 data attributes valid?
...like to write a simple jQuery plugin that displays inline modals under specified elements. My idea is for the script to auto-init based on data attributes specified on elements.
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“unmappable character for encoding” warning in Java
... characters... they are parsed before doing lexical analysis. For example, if you put this comment /* c:\unit */ to your code, it will not compile anymore, because "nit" isn't correct hex number.
– Peter Štibraný
Jan 21 '09 at 11:25
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Why does ~True result in -2?
... "customized" versions of the integers 1 and 0 that only print themselves differently. They are subclasses of the integer type int.
So they behave exactly as 1 and 0, except that bool redefines str and repr to display them differently.
>>> type(True)
<class 'bool'>
>>> isin...
Rails filtering array of objects by attribute value
...es = [], []
@attachments.each do |attachment|
@logos << attachment if attachment.file_type == 'logo'
@images << attachment if attachment.file_type == 'image'
end
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MySQL check if a table exists without throwing an exception
What is the best way to check if a table exists in MySQL (preferably via PDO in PHP) without throwing an exception. I do not feel like parsing the results of "SHOW TABLES LIKE" et cetera. There must be some sort of boolean query?
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Where to place and how to read configuration resource files in servlet based application?
...properties file and access it when required. Is this a correct procedure, if so then where should I place this file? I am using Netbeans IDE which is having two separate folders for source and JSP files.
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