^ [char] commands in terminal

I have found the following control commands very useful in terminal and Firefox.

^x
^l
^h remove character
^a
^e
^u
^b
^f
^r

^p
^n

Awk

1. md5sum *.java | awk '{print $1}' | sort | uniq -d

Hashes

1. md5sum *.java | uniq -d -w32

Diff commands

1. diff <(man uniq) <(man guniq)
2. vimdiff <(man uniq | col -b) <(man guniq | col -b)

Perl, Python and Tcl

Easy: Tcl (Tk toolkit)
Harder: Perl, Python

NB You need to install Tcl to Mac by MacPorts

Unix philosophy

Unix thinks everything as files, while Linux has gone further.
Linux sees some files also as pipes.

NB files can be processes, drivers and memory handling.

Commands to write manuals

1. $ pod2man // Mac. Docbook is similar