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);

1 2	String[] cmds = {"open", tempFile.getAbsolutePath(), "-a", "/Applications/Microsoft Office 2011/Microsoft Excel.app"}; Runtime.getRuntime().exec(cmds);

Posted in Java, Mac, Office | Leave a comment

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 a green similar to linux terminal)
export PS1='\n\[\e[1;30m\]┌─\[\e[0m\]\[\e[01;343m\]\u@\h\[\e[00m\]:\[\e[01;34m\]\w\[\e[00m\]\n\[\e[1;30m\]└──\[\e[0m\]\$ \[\e[00;33m\]$(__git_ps1 "(%s)")\[\e[00m\]'

#enables color for iTerm
export TERM=xterm-color

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

#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 a green similar to linux terminal)

export PS1='\n\[\e[1;30m\]┌─\[\e[0m\]\[\e[01;343m\]\u@\h\[\e[00m\]:\[\e[01;34m\]\w\[\e[00m\]\n\[\e[1;30m\]└──\[\e[0m\]\$ \[\e[00;33m\]$(__git_ps1 "(%s)")\[\e[00m\]'

#enables color for iTerm

export TERM=xterm-color

Posted in CentOS, Git, Linux, Mac, Ubuntu | Leave a comment

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>

<name>hbase.rootdir</name>

<value>file:///{{location}}/data</value>

</property>

<name>hbase.zookeeper.property.dataDir</name>

<value>{{location}}/zookeeper</value>

</property>

<name>hbase.zookeeper.quorum</name>

<value>{{hostname}}</value>

</property>

start hbase service bin/start-hbase.sh run hbase shell bin/hbase shell stop hbase shell service bin/stop-hbase.sh

Posted in HBase, Mac | Leave a comment

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))

Posted in Linux, Mac | Leave a comment

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.

Posted in Linux, Shell Script | Leave a comment

[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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