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List files recursively in Linux CLI with path relative to the current directory
... filter out the ones you want.
If the command is not found, you can install it:
Type following command to install tree command on RHEL/CentOS and Fedora linux:
# yum install tree -y
If you are using Debian/Ubuntu, Mint Linux type following command in your terminal:
$ sudo apt-get install tre...
Run cron job only if it isn't already running
...on job as a sort of watchdog for a daemon that I've created. If the daemon errors out and fails, I want the cron job to periodically restart it... I'm not sure how possible this is, but I read through a couple of cron tutorials and couldn't find anything that would do what I'm looking for...
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How to express a NOT IN query with ActiveRecord/Rails?
.... It would still break on nil, but I find that the array you pass in is usually generated by a filter that will return [] at the very least and never nil. I recommend checking out Squeel, a DSL on top of Active Record. Then you could do: Topic.where{id.not_in actions}, nil/empty/or otherwise.
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A Java collection of value pairs? (tuples?)
...if I understand correctly, rolling out a simple pair class yields a syntax error, a subpar hashCode method, null pointer exceptions, no compareTo method, design questions ... and people still advocate rolling out this class while it exists in Apache commons. Please, just copy the code if you don't w...
微博为什么限制140字(附短信70字限制考) - 创意 - 清泛网 - 专注C/C++及内核技术
...就注册了，之后再也没登录过。今天在人人网转发状态，提示我超过140字了，突然就好奇大家都在凑什么热闹，为什么除了网易微博，都限制140个字呢?
当然也已经有过关于这个问题的解释，比如人民网上这位“并没有twitter方...
Count occurrences of a char in a string using Bash
...
you can for example remove all other chars and count the whats remains, like:
var="text,text,text,text"
res="${var//[^,]}"
echo "$res"
echo "${#res}"
will print
,,,
3
or
tr -dc ',' <<<"$var" | awk '{ print length; }'
or
tr -dc ',' &l...
How to sort a list of objects based on an attribute of the objects?
...u might want to do the following, then:
try: import operator
except ImportError: keyfun= lambda x: x.count # use a lambda if no operator module
else: keyfun= operator.attrgetter("count") # use operator since it's faster than lambda
ut.sort(key=keyfun, reverse=True) # sort in-place
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Batch files - number of command line arguments
...nts which may contain quotes and was an overlooked leftover from trial-and-error phase) but was since fixed to how it is now.
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Inline comments for Bash?
...s a valid expression. A real comment would generate something like: syntax error near unexpected token &&'`
– Sebastian Wagner
Sep 13 '18 at 15:59
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How to sort git tags by version string order of form rc-X.Y.Z.W?
...played ref has fewer components than <N>, the command aborts with an error.
For git tag, when unspecified, defaults to %(refname:strip=2).
Update Git 2.12 (Q1 2017)
See commit c026557, commit b178464, commit 51acfa9, commit b823166, commit 109064a, commit 0c1b487, commit 9ffda48, commit ...