I would like to query the data that I need only from a server to another server, and I just use one line of command in linux shell [code lang=”shell”] mongoexport -h fromHost.com -d fromDB -c fromCollection -q ‘{ count: { $gte: 1 } }’ | mongoimport -h toHost.com -d toNewDB -c toNewCollection [/code] If […]
mongoexport and mongoimport with query from one host to one host Read More »
I need to find out the duplicate data content in my 40 Millions records, then I can make the unique index to my name field. [code lang=”shell”] > db.collecton.aggregate([ … { $group : {_id : "$field_name", total : { $sum : 1 } } }, … { $match : { total : { $gte :
Fast way to find duplicate data in MongoDB Read More »
You may found this error from your php-fpm and the php-fpm crash [code lang=”shell”] tail /var/log/php-fpm/error.log [15-May-2016 12:24:13] ERROR: failed to ptrace(PEEKDATA) pid 17402: Input/output error (5) [15-May-2016 12:24:13] ERROR: failed to ptrace(PEEKDATA) pid 17777: Input/output error (5) [15-May-2016 12:24:13] ERROR: failed to ptrace(PEEKDATA) pid 18886: Input/output error (5) [15-May-2016 12:25:53] ERROR: failed to ptrace(PEEKDATA)
ERROR: failed to ptrace(PEEKDATA) pid 17402: Input/output error (5) Read More »
After I install MongoDB 3.2.3 in Centos 7, I received this error when I start mongo in shell. Solution Create the init.d script. Create the following file at /etc/init.d/disable-transparent-hugepages: Make it executable. Run the following command to ensure that the init script can be used:
WARNING: /sys/kernel/mm/transparent_hugepage/enabled is ‘always’. Read More »
[code lang=”shell”] [root@master ~]# mongo MongoDB shell version: 3.2.3 connecting to: test Server has startup warnings: 2016-02-29T23:11:36.666+0700 I CONTROL [initandlisten] 2016-02-29T23:11:36.667+0700 I CONTROL [initandlisten] ** WARNING: Cannot detect if NUMA interleaving is enabled. Failed to probe "/sys/devices/system/node/node1": Permission denied 2016-02-29T23:11:36.667+0700 W CONTROL [initandlisten] 2016-02-29T23:11:36.667+0700 W CONTROL [initandlisten] Failed to probe "/sys/kernel/mm/transparent_hugepage": Permission denied 2016-02-29T23:11:36.667+0700 W
I need to find some string in all folders. [code lang=”bash”] grep -rnw ‘./folder/’ -e “search-text” [/code] Note: -r is recursive -n is line number -w stands match the whole word
Finding all files containing a text string on Linux or Mac Read More »
I want to mass rename hundred of filenames like filename 001.jpg to filename-001.jpg … … … filename 099.jpg to filename-099.jpg I use this command to rename all in few seconds in my MacBook Pro. I think it is fine to run in any linux. [code lang=”bash”] for f in *\ *; do mv "$f" "${f//
Fastest way to rename filenames with space to dash in linux Read More »
You received error from the sed command in Mac, because the argument in mac is different. If you type in Mac terminal, you may receive error like this [code lang=”bash”] Justins-MacBook-Pro:2 juzhax$ sed -i ‘s/old_text/new_text/g’ example.txt sed: 1: "config.php": command c expects \ followed by text [/code] The first argument should be the extension of
command c expects followed by text error in Mac Read More »
One of the nice book that suitable for Hacker, but too bad it is in Japanese version. Wish someone will translate to English version in future. You can find the author from here Satoru Takabayashi, Fumitoshi Ukai, Yusuke Sato, Shinichiro Hamaji, Kazuyuki Shudo Chapter 1. Introduction 1. Introduction to Binary Hacks 2. Terminology of Binary Hacks 3. Using “file” to
Hacker’s Secret 100 Secret Techniques Revealed Read More »
