awk HowTo - Linux / Unix Q & A from nixCraft

How to print filename with awk on Linux / Unix

February 3, 2018in BASH Shell, Linux, UNIX last updated February 3, 2018

I would like to print filename with awk on Linux / Unix-like system. How do I print filename in BEGIN section of awk? Can I print the name of the current input file using gawk/awk?

Howto: Call Shell Script function In echo statement

January 21, 2011in BASH Shell last updated January 21, 2011

I need to call the function called foo() using echo command in the same statement. How do I all or invoke the function using the echo statement?

Linux: Parse an IP Address

January 28, 2010January 28, 2011in Linux last updated January 28, 2011

How do I parse my Linux servers IP address using a Bash shell?

How To Use awk In Bash Scripting

August 15, 2009August 7, 2017in BASH Shell, CentOS, Debian / Ubuntu, FreeBSD, Linux, RedHat and Friends, Suse, UNIX last updated August 7, 2017

How do I use awk pattern scanning and processing language under bash scripts? Can you provide a few examples?

Awk Print Line After A Matching /regex/

May 13, 2009May 13, 2009in BASH Shell, CentOS, Debian / Ubuntu, FreeBSD, Linux, RedHat and Friends, Suse, Ubuntu Linux, UNIX last updated May 13, 2009

How do I a print line after matching /regex/ using awk under Linux / UNIX operating systems? I’d like print the line immediately after a line that matches /regex/ but not the line that matches itself.

BASH: Prepend A Text / Lines To a File

August 23, 2008November 2, 2016in BASH Shell, CentOS, Debian / Ubuntu, Linux, Linux / UNIX File Formats, Solaris-Unix, UNIX last updated November 2, 2016

I am a new Unix system user with a bash as a default shell. I can append text to a file using >> operator but how do I prepend a text to a file? I want the opposite operation of >>? How can I prepend some data to a text file?

HowTo: Read a File Line By Line Using awk

February 21, 2007October 1, 2011in BASH Shell, Debian / Ubuntu, FreeBSD, HP-UX Unix, Linux, OpenBSD, RedHat and Friends, Solaris-Unix, Suse, UNIX last updated October 1, 2011

How do I read a file line by line using awk utility under Unix / Linux operating systems?