Category Archives: OS

[Linux] use tee to write log

Posted on 2017 年 12 月 20 日 by cowman.chiang

Source: stackoverflow: How do I write stderr to a file while using “tee” with a pipe? sh test.sh 2>&1 | tee “test.log”

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Getting around Active Directory search size limit via ldapsearch

Posted on 2017 年 08 月 22 日 by cowman.chiang

ldapsearch -E pr=500/noprompt -v -x -LLL -h host:port -D account -w password -b “DC=base,DC=dn” -s sub “(objectClass=user)” -E pr=500/noprompt : 500 results per page, no prompt -E pr=1000/prompt : 1000 results per page, show prompt Source: Getting around Active Directory … Continue reading →

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Linux command to get time in milliseconds

Posted on 2017 年 05 月 19 日 by cowman.chiang

src: Linux command to get time in milliseconds date +”%T.%N” returns the current time with nanoseconds. date +”%T.%6N” returns the current time with nanoseconds rounded to the first 6 digits, which is microseconds. date +”%T.%3N” returns the current time with … Continue reading →

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open external program from java for mac os x

Posted on 2017 年 03 月 24 日 by cowman.chiang

String[] cmds = {“open”, tempFile.getAbsolutePath(), “-a”, “/Applications/Microsoft Office 2011/Microsoft Excel.app”}; Runtime.getRuntime().exec(cmds);

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Add git branch name to bash prompt

Posted on 2017 年 03 月 23 日 by cowman.chiang

edit ~/.bash_profile if [ -f $(xcode-select -p)/usr/share/git-core/git-completion.bash ]; then . $(xcode-select -p)/usr/share/git-core/git-completion.bash . $(xcode-select -p)/usr/share/git-core/git-prompt.sh fi #enables color in the terminal bash shell export CLICOLOR=1 #sets up the color scheme for list export LSCOLORS=ExFxCxDxBxegedabagacad #sets up the prompt color (currently … Continue reading →

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Install Hbase 5.9 in Mac OS X

Posted on 2017 年 03 月 10 日 by cowman.chiang

Download hbase package tar.gz file from https://www.cloudera.com/documentation/enterprise/release-notes/topics/cdh_vd_cdh_package_tarball_59.html Untar tar.gz file edit conf/hbase-env.sh export JAVA_HOME={{JAVA_HOME Directory path}} edit conf/hbase-site.xml <property> <name>hbase.rootdir</name> <value>file:///{{location}}/data</value> </property> <property> <name>hbase.zookeeper.property.dataDir</name> <value>{{location}}/zookeeper</value> </property> <property> <name>hbase.zookeeper.quorum</name> <value>{{hostname}}</value> </property> start hbase service bin/start-hbase.sh run hbase shell bin/hbase shell stop … Continue reading →

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Get timestamp in milliseconds

Posted on 2017 年 01 月 24 日 by cowman.chiang

echo $(($(date +%s%N)/1000000)) in Mac OS X, the command date does not support the %N flag, we can install coreutils using homebrew. brew install coreutils Then use gdate to get which we want. echo $(($(gdate +%s%N)/1000000))

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find unused files and delete them

Posted on 2017 年 01 月 16 日 by cowman.chiang

find /var/log/radius/radacct -type f -name “reply*” -mtime +60 -exec rm -rf {} \; -mtime N — more than N days without being edited -exec CMD {} \; — comands, {} means the files which be found.

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[Linux] sudo: sorry, you must have a tty to run sudo

Posted on 2016 年 08 月 22 日 by cowman.chiang

edit /etc/sudoers find ‘requiretty’ add username like this Defaults:webuser requiretty

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Delete the specific files in all subdirectories

Posted on 2016 年 02 月 26 日 by cowman.chiang

check the find result find . -name “*.bak” -type f delete it find . -name “*.bak” -type f -delete Ref. ask Ubuntu: How can I recursively delete all files of a specific extension in the current directory?

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