AdvancedUnix

SQL vs AWK To all DWBI guys, you can refer below article in case you need to process files in awk just like SQL. All the basic SQL operations, joins explained in awk: Experts, you can proceed to page 3 & 4 directly. https://subhadip.ca//awk-commands-equivalent-to-sql-query/... #awk #fileprocessinginawk #sqlinawk

AWK Pattern-Action Example Refer below post for the regular expression pattern: https://www.facebook.com/advancedunix/posts/616162361910989... #awk #awkprogramming

AWK Built-in variables #awk #awkprogramming

We all are aware that '\n' writes a newline in UNIX while for Windows there is the two character sequence: '\r\n'. We usually faced the issue while transferring file between unix server to local windows machine. The theory is nice. Ever you guys wonder why windows is doing this extra effort? Of course it is an annoyance and extra space holder. Here is the reason: Windows is backward compatible with MS-DOS (aggressively so, even) and MS-DOS used the CR-LF convention because MS...-DOS was compatible with CP/M-80 (somewhat by accident) which used the CR-LF convention because that was how you drove a printer (because printers were originally computer controlled typewriters). Printers have a separate command to move the paper up one line to a new line, and a separate command for returning the carriage (where the paper was mounted) back to the left margin. That's why. And, yes, it is an annoyance, but it is part of the package deal that allowed MS-DOS to win over CP/M, and Windows 95 to win over all the other GUI's on top of DOS, and Windows XP to take over from Windows 98. (Note: Modern laser printers still have these commands because they too are backwards compatible with earlier printers - HP in particular do this well)

AWK Introduction #awk #awkprogramming

Posts on AWK will be started very soon.. Follow this page to get the updates on posts. #awk #awkprogramming https//www.facebook.com/advancedunix

Regular expression - all together. #regularexpression

Regular expressions continued.... #regularexpressions

Steps to create bootable USB drive with Linux. Links: https://www.ubuntu.com/download/desktop https://sourceforge.net/projects/unetbootin/... #bootableusb

A quick recall on regular expressions which will be used in upcoming posts on egrep/sed/awk. #regularexpression #sed #awk #egrep

#specialvariables

A note on Control-M character: #controlm

#variablesubstitution

#passwordlesslogin #ssh #scp #sshkey

Message us directly from your messenger app just by scan below code:

#customprompt #PS1

#ftp #scp #fileintegrity #md5

#quoteoftheday #unix

#singlequote #doublequote #shellexpansions

Copy a directory into another directory: dir_src is your source directory, and dir_dest is your destination directory. below command will fail: $ cp dir_src dir_dest... You have to use option -r for this: $ cp -r dir_src dir_dest Whole dir_src along with its subdirectories will be copied into dir_dest recursively. #cp