Some other Bash tips

Expansion

As we saw in the last episode 1951 (and others in this sub-series) there are eight types of expansion applied to the command line in the following order:

Brace expansion (we looked at this subject in episode 1884)

Tilde expansion (seen in episode 1903)

Parameter and variable expansion (this was covered in episode 1648)

Command substitution (seen in episode 1903)

Arithmetic expansion (seen in episode 1951)

Process substitution

Word splitting

Pathname expansion

We will look at process substitution and word splitting in this episode but since there is a lot to cover in these subjects, we'll save pathname expansion for the next episode.

I have written out a moderately long set of notes about this subject and these are available here http://hackerpublicradio.org/eps/hpr2045/full_shownotes.html.

Links

HPR episode 1648 "Bash parameter manipulation": http://hackerpublicradio.org/eps.php?id=1648

HPR episode 1843 "Some Bash tips": http://hackerpublicradio.org/eps.php?id=1843

HPR episode 1884 "Some more Bash tips": http://hackerpublicradio.org/eps.php?id=1884

HPR episode 1903 "Some further Bash tips": http://hackerpublicradio.org/eps.php?id=1903

HPR episode 1951 "Some additional Bash tips": http://hackerpublicradio.org/eps.php?id=1951

"Introduction to sed" series on HPR:

Part 1: http://hackerpublicradio.org/eps.php?id=1976

Part 2: http://hackerpublicradio.org/eps.php?id=1986

Part 3: http://hackerpublicradio.org/eps.php?id=1997

Part 4: http://hackerpublicradio.org/eps.php?id=2011

Wikipedia article on the "Named pipe": https://en.wikipedia.org/wiki/Named_pipe

Wikipedia article on the "IFS" variable: https://en.wikipedia.org/wiki/Internal_field_separator

Advanced Bash-Scripting Guide: Section 9.1 Bash Internal Variables (including IFS): http://www.tldp.org/LDP/abs/html/internalvariables.html