Category Archives: Operating System

Find and Replace File Content using Linux Command Line

Posted on September 18, 2012 by ronaldpringadi

1find . -name "*.pgsql" -print | xargs sed -i ‘s/STRINGTOREPLACE/REPLACERSTRING/g’

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How To List All Users or Groups in Linux

Posted on August 20, 2012 by ronaldpringadi

To list all users in Linux: 1cat /etc/passwd See only the first word before double colon (:) for exampple, user “root” will look like: root:x:0:0:root:/root:/bin/bash And to list all groups do the following 1cat /etc/group

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Preventing Another Instance of A Program Running in Linux

Posted on June 16, 2012 by ronaldpringadi

The code below is my solution for preventing a program from running more than once at the same time in Linux. The scenario: Consider if you have a cron job (jobA.sh) set to run at 6PM, 7PM, and 8PM. While … Continue reading →

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MySQL Backup and Restore – Using Command Line

Posted on March 11, 2012 by ronaldpringadi

Here is how you backup database using command line. The first line is to backup and the second line is to restore. These commands work on both Windows and Linux. In Windows you might want to setup mysql bin directory … Continue reading →

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Delete All Symlink in The Current Directory

Posted on February 27, 2012 by ronaldpringadi

find . -maxdepth 1 -type l -exec rm -f {} \;

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Benchmark How Long a Program Runs In Linux Using Bash

Posted on February 14, 2012 by ronaldpringadi

The following bash code might come handy for those of you who want to benchmark how long does a program runs. In the following example the assumption is that you want to pass along two parameters for your program to … Continue reading →

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Auto Login Using SSH Public and Private Keys

Posted on February 13, 2012 by ronaldpringadi

Assume that your main server (the one you use the most) is ServerA. And from ServerA, you want to automatically login to ServerB. For illustration purpose, ServerB can be a repo server and you don’t want to keep being asked … Continue reading →

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Linux Soft Symlink Folder or Directory

Posted on February 13, 2012 by ronaldpringadi

$ ln -s /home/rpringad/somefolder /home/rpringad/newfolder #or if your current directory is already /home/rpringad: $ ln -s /home/rpringad/somefolder /home/rpringad/newfolder $ ln -s existingSourceFolder newLinkedFolder

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How To Know Which Linux Distribution You Are Using?

Posted on January 24, 2012 by ronaldpringadi

There are three commands that you can use, pick one of them: 12345cat /etc/issue cat /proc/version dmesg | head -1

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How to Set up an FTP Server in Ubuntu Linux

Posted on January 18, 2012 by ronaldpringadi

Login to your Linux shell menu as root 12[root@locahost]# apt-get install vsftpd [root@locahost]# vim /etc/vsftpd.conf At VIM, 1st comment out anonymous_enable by adding a # sign at the beginning of the line # anonymous_enable=YES 2nd remove comment at local enable … Continue reading →

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