Bash Shell Programming HowTos

Tutorials, howtos and programming tips about GNU Bourne-Again SHell (BASH) for Apple OS X, Linux, *BSD and Unix like operating systems. ( rss feed )

I have setup a shell variable called dest=”/nas100/backups/servers/z/zebra/mysql.tgz”. How do I find out filename (mysql.tgz) and extension (.tgz) in bash program running under Linux or Unix operating systems?

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How do I split string based on delimiter into array under Bash shell?

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I have a line as follows in squid.conf file. My sever is hosted in a cloud:

acl verizonfios src 1.2.3.4

My ISP will force an IP address change every week or two. I would like to replace them with a new IP

acl verizonfios src 4.5.6.7

How do I replace the line starting with “acl verizonfios” with new IP address using sed and ssh?

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How can I find out the path of the directory in which my bash shell script is located and store that path in _base variable?

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HTTP protocol allows a client to specify a time condition for the document it requests. It is If-Modified-Since or If-Unmodified-Since. How do I use curl Unix/Linux command line option to test a server with If-Modified-Since condition and validate Last-Modified settings?

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My shell script depends upon user input. How do I find out if a variable called $_JAIL path is empty under Linux / Apple OS X / Unix like operating systems?

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I am using a bash shell under Ubuntu Linux operating system. Sometime I need to restrict my own Internet bandwidth for all my shell applications such as ftp, sftp, wget, curl and friends. How do I limit the network speed under bash without setting up a complicated firewall and tc rules as described here?

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