shell variables HowTo - Linux / Unix Q & A from nixCraft

Linux / Unix: Bash Shell See All Exported Variables and Functions

last updated June 19, 2012 in BASH Shell

How do I see a list of all exported variables and functions under Unix bash shell?

Bash Assign Output of Shell Command To Variable

last updated November 27, 2019 in BASH Shell, Linux, UNIX

How do I assign the output of a shell command to a shell variable under Unix like operating system? For example, I want to store the date command output to a variable called $now. How do you do that? How can I set a variable to the output of a command in Bash?

Use export Command in Linux / Unix

last updated September 30, 2015 in BASH Shell, Debian / Ubuntu, FreeBSD, Linux, RedHat and Friends, Suse, UNIX

How do I use export command under a Linux or Unix-like operating systems to set variables on a bash shell?

Bash Pass Shell Variables To Awk Script

last updated September 28, 2019 in BASH Shell, CentOS, Debian / Ubuntu, FreeBSD, Linux, RedHat and Friends, Suse, UNIX

How do I pass shell variables to awk command or script under Linux or UNIX-like operating systems? How do I use shell variables in an awk script? How can I allow awk to use shell variables?

Linux: Set Environment Variable

last updated March 29, 2012 in BASH Shell, Linux

Bash shell is used for various purposes under Linux. How do I customize the shell environment variable under Linux operating systems?

HowTo: Use Oracle / MySQL SQL Commands In UNIX Shell Scripts

last updated January 29, 2010 in BASH Shell

How do I call Oracle or MySQL sql statements in UNIX / Linux shell scripts?

Bash Shell Loop Over Set of Files

last updated June 29, 2010 in AIX, BASH Shell, CentOS, Debian / Ubuntu, File system, FreeBSD, HP-UX Unix, Linux, OpenBSD, Solaris-Unix, Suse, Ubuntu Linux, UNIX

How do I run shell loop over set of files stored in a current directory or specified directory?