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Fast way of finding lines in one file that are not in another?
... # preserve whitespace
(NR==FNR) { ll1[FNR]=$0; nl1=FNR; } # file1, index by lineno
(NR!=FNR) { ss2[$0]++; } # file2, index by string
END {
for (ll=1; ll<=nl1; ll++) if (!(ll1[ll] in ss2)) print ll1[ll]
}
This stores the entire contents of file1 line by line in a line-...
How do I pipe or redirect the output of curl -v?
...xtract, and what information do you want to throw away. I understood your question to mean that you want all of the output of -v directed to stdout.
– SingleNegationElimination
Mar 25 '11 at 13:44
...
How can I shift-select multiple checkboxes like GMail?
...
}
if (e.shiftKey) {
var start = $chkboxes.index(this);
var end = $chkboxes.index(lastChecked);
$chkboxes.slice(Math.min(start,end), Math.max(start,end)+ 1).prop('checked', lastChecked.checked);
}
lastChecked = this;
...
Count with IF condition in MySQL query
...automatically convert NULL to '' when fetching the value. For example with PHP's mysqli interface it would be safe to run your query without COALESCE().
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How do I get the 'clear' command in Cygwin?
... @AndrewProck It seems to be there now!
– Rohaq
Dec 20 '13 at 17:42
Thanks for this! If you've already installe...
MySQL复制的概述、安装、故障、技巧、工具 - 数据库(内核) - 清泛网 - 专注...
.../my.cnf）：
[mysqld]
server_id = 100
log_bin = mysql-bin
log_bin_index = mysql-bin.index
sync_binlog = 1
innodb_flush_log_at_trx_commit = 1
innodb_support_xa = 1
注：一定要保证主从服务器各自的server_id唯一，避免冲突。
注：如果没有指定log_bin的话，缺...
How to determine whether a substring is in a different string
... @GamesBrainiac Actually, to do the same in JS it's just string.indexOf(substring) != -1, more here
– LasagnaAndroid
Feb 20 '14 at 20:42
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Why should I use a pointer rather than the object itself?
...st shows how many bad C++ programmers there are.
In a sense, you have two questions bundled up into one. The first is when should we use dynamic allocation (using new)? The second is when should we use pointers?
The important take-home message is that you should always use the appropriate tool for...
What's the best practice for primary keys in tables?
...ary keys will be foreign keys in another table as well as used in multiple indexes. The smaller your key, the smaller the index, the less pages in the cache you will use.
Primary keys should never change. Updating a primary key should always be out of the question. This is because it is most likely ...
How to configure Visual Studio to use Beyond Compare
...ctually be using BComp.exe -- see scootersoftware.com/vbulletin/showthread.php?t=3461
– Joe
Jul 13 '11 at 15:28
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